File: changelog.in

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gecode 3.4.0-1
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#
#  Main authors:
#     Christian Schulte <schulte@gecode.org>
#
#  Copyright:
#     Christian Schulte, 2005
#
#  Last modified:
#     $Date: 2010-07-22 12:00:29 +0200 (Thu, 22 Jul 2010) $ by $Author: schulte $
#     $Revision: 11249 $
#
#  This file is part of Gecode, the generic constraint
#  development environment:
#     http://www.gecode.org
#
#  Permission is hereby granted, free of charge, to any person obtaining
#  a copy of this software and associated documentation files (the
#  "Software"), to deal in the Software without restriction, including
#  without limitation the rights to use, copy, modify, merge, publish,
#  distribute, sublicense, and/or sell copies of the Software, and to
#  permit persons to whom the Software is furnished to do so, subject to
#  the following conditions:
#
#  The above copyright notice and this permission notice shall be
#  included in all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
#  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
#  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
#  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
#  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
#  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

# 
# This file contains entries for changelogs
#
# There are two kinds of entries: one marking releases and the others 
# being actual entries.
#
# All the lines for describing entries must start at the beginning.
#
# A release is described as follows:
#   [RELEASE]
#   Version: <version string>
#   Date:    <when release>
#   [DESCRIPTION]
#   ... All the text up to the next [ENTRY] is included 
#   as description
#
# An entry is described as follows:
#   [ENTRY]
#   Module: 
#     kernel|search|int|set|cpltset|example|minimodel|iter|support|
#     scheduling|driver|test|gist|flatzinc|other
#   What:   bug|documentation|performance|new|removed|change
#   Rank:   minor|major
#   Bug:    <optional, for number from bugzilla>
#   Thanks: <optional, who reported etc>
#   [DESCRIPTION]
#   ... All the text up to the next [ENTRY] or [RELEASE] is included 
#   as description
#   [MORE]
#    ... If a more section is included, then it will be displayed as an
#    optional section in the html page.
#

[RELEASE]
Version: 3.4.0
Date: 2010-07-26
[DESCRIPTION]
This release includes: considerably improved support for posting
expressions and relations (also including set and full arithmetic
expressions); other improvements for modeling (array
initialization and element addition to arrays); state-of-the-art
unary and cumulative scheduling propagators (including optional
and flexible tasks); major cleanups of the variable and view
infrastructure (now also documented in MPG); cleanups of the
examples; several other fixes and performance improvements. 

This release is the first to be accompanied by a complete version
of "Modeling and Programming in Gecode" which has been extended
by many new case studies and parts on programming search engines
and variables.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Boolean relations were incorrect on assigned arguments.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Posting a propagator in a failed space could make the space
non-failed again.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Added LocalObject and LocalHandle classes that can be used for
space-allocated objects that are shared within a space, for
example among several propagators or propagators and branchers.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Completely cleaned up variables and views, drastically saving code.

[ENTRY]
Module: other
What:   removed
Rank:   minor
[DESCRIPTION]
Variables do not have init functions any longer as they are not
needed, see MPG for discussion.

[ENTRY]
Module: scheduling
What:   new
Rank:   major
[DESCRIPTION]
Added scheduling constraints for tasks with flexible duration
(for both unary and cumulative resources), and made all scheduling
propagators deal correctly with zero length tasks.

[ENTRY]
Module: scheduling
What:   new
Rank:   major
[DESCRIPTION]
Added propagators for cumulative scheduling.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
Fixed a bug in minimodel, which could crash when using zero
coefficients.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
The driver now catches SIGINT (i.e., pressing Ctrl-C) and stops
the search properly, printing statistics up to the point where
it stopped.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
If an inspector throws an exception, an error message is 
printed indicating which inspector caused the problem.
Previously, Gist would crash with a Qt error that was difficult
to trace.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed garbage collection of variables that are not printed. The 
bug lead to variables being mixed up in the output.

[ENTRY]
Module: example
What:   removed
Rank:   minor
[DESCRIPTION]
Removed stress tests, the real examples are much more stressful,
actually!

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
The Matrix class now supports const operations and has an output
operator.

[ENTRY]
Module: minimodel
What:   change
Rank:   major
[DESCRIPTION]
Linear expressions can now contain non-linear parts, such as
multiplications or divisions, or set expressions such as
cardinality.

[ENTRY]
Module: minimodel
What:   change
Rank:   major
[DESCRIPTION]
The minimodel post functions have been split into two functions, rel
and expr. While rel posts a constraint, expr returns a new variable
constrained to the given expression. This change makes it possible to
get rid of the reification operator (~) as well as the tt and ff
functions, which were previously needed to distinguish between
relations and expressions. Boolean equivalence and implication can
now be expressed using operators (==,<<,>>).

[ENTRY]
Module: minimodel
What:   new
Rank:   major
[DESCRIPTION]
The minimodel library now provides convenient post functions
for set constraints.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed the include and exclude tell operations of set variables so
that they work with empty ranges.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
The Nonogram example now uses AFC as the default branching and 
includes some more instances.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New custom branching for the BACP example using a custom value selection.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The configure script now checks for qmake-qt4 and moc-qt4, which are used on 
some Linux systems to distinguish between Qt3 and Qt4.

[ENTRY]
Module: driver
What: 	change
Rank:	minor
[DESCRIPTION]
Running a script in time mode stops all iterations and samples
immediately if a single run reaches a limit (eases benchmarks
with timeouts).

[ENTRY]
Module: minimodel
What: 	int
Rank:	minor
[DESCRIPTION]
Optimized element propagator, expect a speed up of around 35-50%
in most cases.

[ENTRY]
Module: minimodel
What: 	performance
Rank:	minor
[DESCRIPTION]
Posting linear expressions performs more aggressive optimizations
for assigned variables.

[ENTRY]
Module: minimodel
What: 	performance
Rank:	minor
[DESCRIPTION]
Arithmetic modeling functions now try to avoid creating new
variables and posting propagators for common cases.

[ENTRY]
Module: set
What: 	change
Rank:	minor
[DESCRIPTION]
The argument arrays now have constructors that create new variables.

[ENTRY]
Module: int
What: 	change
Rank:	minor
[DESCRIPTION]
The argument arrays now have constructors that create new variables.

[ENTRY]
Module: int
What: 	change
Rank:	minor
[DESCRIPTION]
IntArgs with simple sequences of values can now be created using the 
IntArgs::create static member function.

[ENTRY]
Module: other
What: 	change
Rank:	minor
[DESCRIPTION]
The build system now supports Visual C++ 2010.

[ENTRY]
Module: minimodel
What: 	change
Rank:	minor
[DESCRIPTION]
Array slices can now be empty.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The support for dynamically resizing variable arrays has been
removed (it was buggy and inefficient). Instead, all argument
arrays now support adding elements using operator<<. In addition,
all arrays now support concatenation using operator+ and slicing,
and variable arrays, view arrays, and variable argument arrays
include a test whether all variables are assigned.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Take advantage of the better modeling support for the BIBD, Golomb
ruler, Kakuro, Black Hole, and Warehouse examples (nothing but dusting off
examples that have been around for ages).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
You can now construct IntArgs from an STL vector, an IntSharedArray,
or using simple comprehensions.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in Gist where signals were sent across threads, which
makes Qt crash in certain situations on some platforms.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
Thanks: David Zaremby
[DESCRIPTION]
Fixed bug in interactive search where every move in the tree required 
recomputation.


[RELEASE]
Version: 3.3.1
Date: 2010-04-09
[DESCRIPTION]
This release adds many new features to Gist, fixes two major bugs
in extensional constraints, and has some more cleanups to comply
with the first release of the "Modeling and Programming with
Gecode" document. And, as always some small fixes and cleanups.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
[DESCRIPTION]
Removed many small documentation quirks.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
Variables that do not have output annotations are now garbage
collected during copying.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
When using sums of Boolean variables using bool2int in MiniZinc,
the FlatZinc interpreter now posts the more efficient propagators
that work directly on the Boolean variables.

[ENTRY]
Module: scheduling
What:   bug
Rank:   minor
[DESCRIPTION]
The unary scheduling propagator with optional tasks missed some
propagation sometimes.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed extensional constraint with finite automata for very
unlikely (but apparantely possible) border case.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
In addition to inspectors, you can now also register comparators, which can be 
used to compare two nodes in the tree. In combination with the option to 
compare before computing a fixpoint of the second node, this lets you see what 
exactly was modified by a branching.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed channeling between set and integer variables which did not propagate 
enough.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
The extensional constraints with tuple sets could cause crashes
when used with parallel search.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Missing export declarations prevented embedding Gist as a widget. There is 
now example code for embedding Gist in the directory 
gecode/gist/standalone-example.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
Gist can now stop exploration after all alternatives of a certain branching
are exhausted. This feature can be turned on by posting a special branching
using the Gist::stopBranch post function. Gist will then stop whenever that 
special branching becomes active.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in VarArray::resize function that occurred when shrinking
variable arrays.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The (unused and unusable) CopiedHandle have been removed.

[ENTRY]
Module: scheduling
What:   change
Rank:   minor
[DESCRIPTION]
Tasks in unary scheduling constraints may now have processing times of 0.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added inspection of nodes before fixpoint computation.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
Removed Set::IntSetPropagator and Set::IntSetRePropagator because they are 
subsumed by the MixBinaryPropagator patterns.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug where sometimes clicking on a node would select a different node.

[ENTRY]
Module: gist
What:   performance
Rank:   major
[DESCRIPTION]
Scrolling and zooming have been reimplemented. The new implementation is more 
efficient and works around problems that occurred with large trees on some 
platforms. Zooming is now more intuitive, keeping the current center 
centered. You can now also zoom by pressing shift while using the mouse wheel.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added Gist inspectors for the Knights and Queens examples.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
You can now register Gist inspectors in the driver options.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Nodes can now be bookmarked.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added inspectors that react whenever a node is selected.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Comply with MiniZinc 1.1. String literals are not allowed any longer 
except in annotations, the solver outputs UNKNOWN and UNSATISFIABLE 
instead of just ==========, and the global constraints all_equal, 
decreasing_int, and decreasing_bool are supported.



[RELEASE]
Version: 3.3.0
Date: 2010-03-15
[DESCRIPTION]
This release provides some fixes, some performance improvements
for domain propagators, and quite some clean ups how propagators
and advisors report their status to the kernel. Many of these
clean ups are essential to make it easier to program propagators
and branchers with Gecode.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Configure now prepend options to the CXXFLAGS and CFLAGS variables
instead of appending them. That way, defining the variables when
invoking configure overrides the choices configure makes (e.g.
overriding the default -O3 with -O2).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Patterns for reified propagators have been moved to the
Gecode::Int namespace.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Patterns for set propagators have been moved to the
Gecode::Set namespace.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
ViewValBrancher with random value selection did not produce a
random sequence of values.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Advisors now can force its propagator to be rescheduled,
including recomputation of its cost used for scheduling
(normally, a propagator is only rescheduled if its modification
event delta changes). An advisor can signal forceful rescheduling
by returning ES_NOFIX_FORCE or returning the return value of
ES_NOFIX_FORCE_DISPOSE. Read the forthcoming "Modeling and
Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The failure macros for posting GECODE_ES_FAIL and GECODE_ME_FAIL
now only accept a single argument and assume that "home" actually
refers to the home space.  Read the forthcoming "Modeling and
Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The functions ES_FIX_PARTIAL, ES_NOFIX_PARTIAL, ES_FIX_DISPOSE,
and ES_NOFIX_DISPOSE are now member of Space. Read the
forthcoming "Modeling and Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The function ES_SUBSUMED now is a member of Space and accepts a
propagator as its single argument. The variant with a size as the
second argument is available as ES_SUBSUMED_DISPOSED but use is
highly discouraged. Read the forthcoming "Modeling and
Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The functions ES_SUBSUMED_FIX and ES_SUBSUMED_NOFIX for advisors
have been renamed to ES_FIX_DISPOSE and ES_NOFIX_DISPOSE. Read
the forthcoming "Modeling and Programming with Gecode" for
details.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The FlatZinc interpreter can now be extended by plugins that implement
custom search strategies. The plugins are implemented as dynamically loaded
libraries using the Qt plugin mechanism. An example can be found in the
directory gecode/flatzinc/exampleplugin.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The index of the variable used for optimization is now available in the
FlatZincSpace class.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Added command line option -print, which controls whether all solutions are 
printed or only the last one that is found, and -search, to choose between
branch-and-bound and restart optimization.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The FlatZinc library can now parse a FlatZinc model into any subclass of
FlatZincSpace, so that custom extensions can be built. Annotations on the
solve item can now be accessed from the returned FlatZincSpace, so that
additional search strategies can be implemented.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The FlatZinc interpreter ignored the -c-d and -a-d command line 
switches when used with Gist.

[ENTRY]
Module: minimodel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed special cases for posting linear and Boolean expressions
consisting of a single variable only (was highly ambigious).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Linear expressions can freely mix integer and Boolean variables
and support construction from variable arrays via a sum function.

[ENTRY]
Module: support
What:   performance
Rank:   major
[DESCRIPTION]
Changed to single, really efficient bitset implementation used
allover the system.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Considerably improved performance and memory consumption of the
DFA-based extensional constraint (regular).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Integer sets (IntSet) now have a in member function for testing
whether an integer is included.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Avoid inter-thread call to QWidget::update, which apparently causes a slight 
memory leak (and warning messages on stderr) on Mac OS.



[RELEASE]
Version: 3.2.2
Date: 2009-11-30
[DESCRIPTION]
This release adds the sequence constraint (contributed by David
Rijsman, Quintiq) and has as always some small additions and
fixes.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Alberto Delgado
[DESCRIPTION]
The global cardinality (count) constraint now accepts unsorted
arrays of values.  It previously propagated incorrectly if the
array was not sorted.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in the ICL_VAL propagator for global cardinality.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
Support search annotations with constants in the variable arrays.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The memory reported could be sometimes too low (the previous fix
for 3.2.0 did not fix it for branch and bound search).

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks:	Gustavo Gutierrez
[DESCRIPTION]
Added missing assignment operator for space-based allocators for
STL data structures.

[ENTRY]
Module: iter
What:   change
Rank:   minor
[DESCRIPTION]
Renamed test for subset or disjointness of range iterators to "compare".

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The set_in and set_in_reif constraints were buggy when used with Boolean
variables (which are usually not generated by mzn2fzn so that the issue
probably does not occur in practice).

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Subscription to constant views did not honor the flag to avoid
processing (did not occur in practice).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Subscription to constant views did not honor the flag to avoid
processing.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added car sequencing example (problem 1 in CSPLib). Uses the new
sequence-constraint.

[ENTRY]
Module: int
What:   new
Rank:   major
Author:	David Rijsman
[DESCRIPTION]
Added sequence constraint.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Report if search engine has been stopped.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The global_cardinality constraint was not completely compatible with
the MiniZinc semantics. It would constrain values not mentioned in the
array to have zero occurrences, while in MiniZinc they are unrestricted.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
Element constraints in reified positions produced an error in the mzn2fzn
translation.


[RELEASE]
Version: 3.2.1
Date: 2009-11-04
[DESCRIPTION]
This release fixes one serious bug in the element constraint for
matrices; adds branchings using accumulated failure counts (also
known as weighted degree); provides some optimizations (mostly
for element constraints and for regular expressions with millions
of nodes); adds two cute models (word-square and crossword); and
a little this and that as always.

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
Thanks:	H�kan Kjellerstrand
[DESCRIPTION]
Conversion of a regular expression to a DFA would crash on
regular expressions with several million nodes (due to running
out of call stack space).

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Split rel-op.cpp and rel-op-const.cpp into several compilation units, to avoid
excessive memory and time usage of the gcc compiler.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Element constraints for integer arrays now accept shared integer
arrays (IntSharedArray). By this, the very same array can be
shared among several element constraints. Models require no
change, as IntArgs are automatically coerced to
IntSharedArrays. See "Modelling with Gecode" for more
explanation.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The semantics of division and modulo has changed to match the C standard. This
means that the operations round towards zero, and that the result of the 
modulo has the same sign as its first argument.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks: Jan Wolter
[DESCRIPTION]
The Nonogram example no longer crashes on empty lines.

[ENTRY]
Module:	int
What:	performance
Rank:	minor
[DESCRIPTION]
Optimized element for matrices (in special cases, the propagator
is up to six times as efficient as before).

[ENTRY]
Module:	flatzinc
What:	bug
Rank:	minor
[DESCRIPTION]
Fixed statistics output (number of solutions was sometimes wrong).

[ENTRY]
Module:	int
What:	bug
Rank:	major
[DESCRIPTION]
Fixed segfault in matrix element constraint.

[ENTRY]
Module:	example
What:	new
Rank:	minor
Author:	H�kan Kjellerstrand
[DESCRIPTION]
Added word square puzzle.

[ENTRY]
Module:	example
What:	new
Rank:	minor
Thanks:	Peter Van Beek
[DESCRIPTION]
Added crossword puzzle (thanks to Peter Van Beek for providing
access to some crossword grids).

[ENTRY]
Module:	int
What:	new
Rank:	minor
[DESCRIPTION]
Added INT_VAL_RANGES_MIN (and INT_VAL_RANGES_MAX) as value
selection for branching: it tries the values from the smallest
(largest) range first, if the variable's domain has several
ranges, otherwise it splits the domain.

[ENTRY]
Module:	int
What:	bug
Rank:	minor
[DESCRIPTION]
Added missing dispose function for linear disequality of Boolean
variables (the only problem was that with a proper dispose
function more memory can be reused when the propagator becomes
subsumed, so really a tiny quirk).

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added AFC-based branching strategies for integer and Boolean
variables: INT_VAR_AFC_MIN, INT_VAR_AFC_MAX,
INT_VAR_SIZE_AFC_MIN, INT_VAR_SIZE_AFC_MAX. For details, see
"Modeling with Gecode".

[ENTRY]
Module:	set
What:	new
Rank:	major
[DESCRIPTION]
Added AFC-based branching strategies for set variables:
SET_VAR_AFC_MIN, SET_VAR_AFC_MAX, SET_VAR_SIZE_AFC_MIN,
SET_VAR_SIZE_AFC_MAX. For details, see "Modeling with Gecode".

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Propagators and variables now maintain an accumulated failure
count (AFC).
[MORE]
The AFC of a propagator counts how often has the propagator
failed during the entire search, and the AFC of a variable is its
degree plus the sum of the AFCs of all propagators depending on
the variable. While it looks straightforward, this required a
major extension of the Gecode kernel to deal with global
information accessed concurrently from several threads during
search. The AFC is also known as "weighted degree".

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Sudoku and GraphColor now uses smallest size over accumulated failure
count (AFC) as the default heuristic.

[ENTRY]
Module: bug
What:   set
Rank:   minor
[DESCRIPTION]
For branching, SET_VAR_DEGREE_MAX would select the variable with
smallest rather than largest degree.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Now posting of propagators and branchers take an object of class
Home (rather than just a space) that can carry additional
information relevant for posting (for example, groups and
accumulated failure information). Models do not need to be
changed in any way!
[MORE]
While models require no change, propagator rewriting does (it
will work but some information might be lost). Instead of writing
something like
GECODE_REWRITE(*this,SomeProp::post(home,...));
where *this is the propagator to be rewritten, you should now
write
GECODE_REWRITE(*this,SomeProp::post(home(*this),...));
By this, the new propagator will inherit information from *this
(in particular the accumulated failure count).


[RELEASE]
Version: 3.2.0
Date: 2009-10-05
[DESCRIPTION]
This release has some important bug fixes (in particular for
global cardinality aka count), the documentation has been
improved (worked around some issues with generation by doxygen),
integrates the FlatZinc interpreter into the Gecode source tree,
provides propagators for disjunctive scheduling (experimental),
and lots of small changes and fixes. For more consistent names,
branchings are branchers now and branching descriptions are
choices (this you might have to adapt to).


[ENTRY]
Module: scheduling
What:   new
Rank:   major
[DESCRIPTION]
Added propagators for disjunctive scheduling (unary resource
scheduling). This is still experimental as the propagators are
not yet optimized and branching and modelling support is not yet
available.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The memory reported could be sometimes too low (that could only
happen when an advisor allocates memory which they do only now).

[ENTRY]
Module: other
What:   documentation
Rank:   major
[DESCRIPTION]
Cleaned up the generated reference documentation, and introduced a number
of workarounds for issues in doxygen. In particular, the documentation for
linear constraints over Boolean variables and for the thread abstractions
is now generated properly.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
The Gecode interpreter for the FlatZinc language is now part of the main
Gecode source tree.

[ENTRY]
Module: int
What:   performance
Rank:   minor
Thanks:	George Katsirelos, Nina Narodytska
[DESCRIPTION]
Extensional propagators using DFAs or REGs (aka regular) use a
more compact state representation but create their state more
eagerly. That can improve performance considerably (twice as fast) at a slight
increase in memory.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Gist now places clones also on the leftmost branch during search.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
Thanks: Vivian De Smedt
[DESCRIPTION]
Mention that also grep is needed for building Gecode.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jan Kelbel
[DESCRIPTION]
Slightly improved strength of the division propagator.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks: Geoffrey Chu
[DESCRIPTION]
Fixed wrong symmetry breaking for TSP.

[ENTRY]
Module: support
What:   change
Rank:   minor
Thanks: Alexandre Fayolle
[DESCRIPTION]
No longer depend on availability of timersub.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Optimized n-ary disjunction and conjunction and the clause constraint.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Linear constraints over Boolean variables with unit coefficients
(aka Boolean cardinality constraints) have been
reimplemented. Less memory (minus 30%) and more speed. For
example, BIBD runs 10% faster now.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
Optimized thread creation by thread pools, now the creation and
deletion of arbitrarily many parallel search engines also works
for platforms using pthreads (Linux and MacOS).

[ENTRY]
Module: other
What:   change
Rank:   minor
Thanks:	David Rijsman
[DESCRIPTION]
Compiles with MSVC 2005 again.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
The configure script checked for Qt 4.2, although Gist requires at least
Qt 4.3.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed serious bug in the bounds propagator for global cardinality.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
A branching is now a brancher and a branching description is now a choice. 
[MORE]
Classes and member functions have been renamed accordingly. The
change is necessary due to proper explanation in the forthcoming
"Programming with Gecode".

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Compiles again if no threads available.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
The Gist console now has a toolbar that provides buttons to clear the text
as well as to configure the console window to stay on top of Gist. 
Furthermore, after adding output, the console now automatically scrolls to the 
bottom.

[ENTRY]
Module: graph
What:   new
Rank:   minor
[DESCRIPTION]
Cost-based variants for circuit added.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
The element constraint with an integer index variable now throws
an exception if used with an empty array.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The element constraint now computes more accurate variable bounds
when being posted (to avoid arithmetic overflow in naive models).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The element constraint now throws an exception if used with an
empty array.

[ENTRY]
Module: example
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed zero cost edges in TSP examples.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Examples now use the symmetry-option for symmetry-breaking.
[MORE]
The affected examples are:
  - BlackHole
  - EFPA
  - Pentominoes
  - SteelMill
  .

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Added new standard option for options called symmetry.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks:	Kish Shen
[DESCRIPTION]
Added regret_min and regret_max for IntVar and BoolVar (they were
only available for IntView).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Moved cumulatives to the new scheduling library.

[ENTRY]
Module: scheduling
What:   new
Rank:   minor
[DESCRIPTION]
Added a new module for scheduling. To use scheduling
constraints, you have to include <gecode/scheduling.hh> and link
against the scheduling library.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Moved circuit to the new graph library.

[ENTRY]
Module: graph
What:   new
Rank:   minor
[DESCRIPTION]
Added a new module for graph constraints. To use graph
constraints, you have to include <gecode/graph.hh> and link
against the graph library.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added branching following Warnsdorff's heuristic for Knights.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added branch and assign for single integer and Boolean variable.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added branch and assign for single set variable.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
Added element constraints for Matrix interface to arrays.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
Added element constraints for Matrix arrays.

[ENTRY]
Module: set
What:   new
Rank:   minor
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
Added element constraints for Matrix arrays.

[ENTRY]
Module: search
What:   change
Rank:   minor
Thanks: Vincent Barichard
[DESCRIPTION]
Path for search provides top and empty methods.

[ENTRY]
Module: driver
What:   change
Rank:   minor
Bug:    59
Thanks: Luca Di Gaspero
[DESCRIPTION]
The driver takes copies of all string values passed top it.


[RELEASE]
Version: 3.1.0
Date: 2009-05-20
[DESCRIPTION]
This release introduces parallel search, features improved memory
management (can double efficiency on MacOS X), and provides a
reusable command line driver upon popular request. And, of
course, some this and that.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
The set constraint sequentialUnion has been renamed to sequence.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
The parameters of the Hamming Codes example are now configurable
through command line options (instead of hard-coded).

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
The stop function of stop objects now also takes a second argument
of type Search::Options. This is in particular useful for
decisions that involve the number of threads used for search.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Added parallel search engines for DFS, BAB, and Restart (but not
LDS). Please make sure to read the section "Parallel search" in
"Modeling with Gecode".
[MORE]
Parallel search is still experimental: creating and destroying a
large number (more than 1000) of search engines (and hence a
large number of threads) might raise exceptions on operating
systems using pthreads as thread implementation. This will be
fixed in a future release by using thread pools.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Added a tiny portable thread package specifically tailored to the
needs for parallel search. Unfortunately, other portable thread
packages have just too many issues.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a dead lock that could occur when closing the Gist main window while 
search is still running.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
The inspectors are finalized before Gist exits. This fixes a bug
where (at least on Mac OS) some memory was not freed in the
correct order.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Gist now correctly centers the current node after search has finished.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Small user interface changes: disable search from hidden nodes, add depth 
information to status bar, and add statistics for subtrees (available from the 
node context menu and the Node menu).

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Easily add multiple inspectors to Gist. Inspectors are not
exclusive any longer, you can select any combination of them to
respond to clicks or solutions simultaneously.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The INT_VAL_MED value selection now consistently selects the greatest element
in the domain not greater than the median.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
If Gist is not available, -mode gist is the same as -mode
solution. Invocation with -help also prints information about how
Gecode has been configured.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added new example for equidistant frequency permutation arrays (EFPA).

[ENTRY]
Module: kernel
What:   performance
Rank:   major
[DESCRIPTION]
Cache memory blocks from deleted spaces. This hardly increases
peak memory consumption. It improves performance on Windows and
Linux only by up to 5%, but on MacOS by 50% in some cases (this
improvement is absolutely essential for parallel execution).

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added a wait propagator: executes a function when a variable (or
variables) become(s) assigned.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added a wait propagator: executes a function when a variable (or
variables) become(s) assigned.

[ENTRY]
Module: driver
What:   new
Rank:   major
[DESCRIPTION]
Added a new module "driver" as a commandline driver for
scripts. This is due to popular request: most people have been
using the support functionality for examples anyway. This
function is now wrapped into a proper module (and Example is
now called Script to be more general). See "Modeling with Gecode" 
for documentation.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Support::quicksort and Support::insertion support using the less than
operator for the sort order by leaving out the comparator object.


[RELEASE]
Version: 3.0.2
Date: 2009-03-26
[DESCRIPTION]
This is a bug fix release fixing two more embarrassing
bugs. However, this time we redesigned our tests carefully such
that they cover all changes and optimizations done for the
transition from 2.2.0 to 3.0.*. Please update asap.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks: H�kan Kjellerstrand
[DESCRIPTION]
The radiotherapy example was missing in the Makefile.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed bug in optimization of extensional constraints with DFAs
(hard to reproduce, almost impossible).

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
Thanks: Gustavo Guiterrez
[DESCRIPTION]
Fixed bug in posting of Boolean expressions including reified
linear expressions. Again, that escaped our testsuite (also
fixed).

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Reoptimized element with integer values and created bizarre
testcases.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
A separator is printed between solutions in the TextInspector.


[RELEASE]
Version: 3.0.1
Date: 2009-03-24
[DESCRIPTION]
This is a bug fix release fixing two embarrassing bugs that were
not caught by our test infrastructure. Please update asap.


[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Vincent Barichard
[DESCRIPTION]
Fixed bug in element with integer values.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
IntSetArgs no longer inherit from PrimArgArray, which was wrong
as IntSet is no primitive type and hence does not support vararg
initializers.

[ENTRY]
Module: example
What:   bug
Rank:   minor
[DESCRIPTION]
The examples now pass the c-d and a-d command line options correctly to Gist.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Alberto Delgado
[DESCRIPTION]
Fixed bug in reified Boolean linear constraints (an optimization
is currently disabled and will be active in the next release: the
optimization was incorrect and was never tested).

[ENTRY]
Module: example
What:   bug
Rank:   minor
Bug:    56
Thanks: Chris Mears
[DESCRIPTION]
The Steel Mill Slab Design example had two bugs in the search
heuristic and a missing redundant constraint.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added new example for Radiotherapy.



[RELEASE]
Version: 3.0.0
Date: 2009-03-13
[DESCRIPTION]
This release is a major consolidation release: interfaces have
been cleaned up (consistent parameter passing, consistent naming,
simpler Gist interface, namespaces for operator overloading);
some functionality has been extended (propagators can be
non-monotonic; branchings support tie-breaking and random
variable and value selection); some functionality that did not
meet our quality goals has been removed (complete set variables,
reflection); usage has been simplified (auto-linking on Windows,
more commonly used filename extensions); important aspects have
been optimized (memory management, memory usage and efficiency on
64bit machines). These cleanups were in particular necessary to
make %Gecode easier to document (this release is the first to be
accompanied by tutorial documentation explaining how to model
with %Gecode).

Apart from that, many small fixes and additions. Please see below
for the details.

As the interfaces have changed considerably, please consult \ref
PageHowToChange_3 "How to Change to Gecode 3.0.0".

[ENTRY]
Module: example
What:   performance
Rank:   minor
Thanks:	H�kan Kjellerstrand
[DESCRIPTION]
Improved branching for Nonogram examples.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks:	Stefano Gualandi
[DESCRIPTION]
Fixed bug in creation of set variables.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks:	Vincent Barichard
[DESCRIPTION]
Updating of a council of advisors crashed if a propagator has no
advisors (as we had no example of this kind of propagators).

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Element and convexity constraints on set variables have a more
uniform interface, and the match constrained has been renamed to
channel.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Gist now takes an optional argument specifying options for the
search, including the inspectors to be used. The Qt interface has
been cleaned up, so that Gist is easier to extend.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added inspectors that react on every solution instead of a double
click.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
A TupleSet must be finalized before an extensional constraint can
be posted using it.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
Removed automatically generated set projectors, they will come
back eventually. This makes no change to the available
functionality for set variables.

[ENTRY]
Module: cpltset
What:   removed
Rank:   major
[DESCRIPTION]
Complete sets have been removed (just not good enough).

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Author:	Filip Konvicka
[DESCRIPTION]
Integrated space and region-based allocators that work with STL
classes.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in domain consistent min and max propagators.

[ENTRY]
Module: int
What:   performance
Rank:   major
Author:	Tias Guns
[DESCRIPTION]
Integrated an efficient implementation of reified linear
constraints over Boolean variables.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks:	Stefano Gualandi
[DESCRIPTION]
A bug in the independent set example has been fixed (most edges
were ignored).

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
More set branching strategies have been added (for instance random variable 
and value selection), as well as set assignment.

[ENTRY]
Module: other
What:   removed
Rank:   major
[DESCRIPTION]
All support for reflection has been removed: not clean enough,
not powerful enough, too difficult, and too much trouble.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Thanks:	Denys Duchier
[DESCRIPTION]
Added support for synchronized execution during branching
(executes a function).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The specification of propagation cost has changed. It now must be
computed by the static member functions of the class
Gecode::PropCost.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added support for synchronized execution that executes a function
or a static member function when a Boolean variable becomes
assigned (called when).

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks:	David Rijsman
[DESCRIPTION]
Make the variable deltas generated for minus_r more meaningful if
possible.

[ENTRY]
Module: iter
What:   documentation
Rank:   minor
Thanks:	Anden Blah, Morten Boysen
[DESCRIPTION]
Mention that arrays for Iter::Values::Arrays must be sorted.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks:	Roland Yap Hock Chuan
[DESCRIPTION]
Fixed off-by-one bug in extensional for DFAs.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The clone operation on spaces is now const.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
TupleSet now accepts duplicate tuples.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
Renamed size() to ranges() for IntSet (returning the number of
ranges). Added a size() and width() function that return the size
and width of the set respectively.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Introduced CopiedHandle as a new base class for SharedHandle. 
[MORE]
A copied handle provides access to an object that is used by
entities in a space, and that is copied when then space is
copied. This abstraction can be used e.g. to pass information
between different entities in a space, such as between
propagators and branchings.

[ENTRY]
Module: support
What:   bug
Rank:   minor
Thanks:	Michal Dobrogost
[DESCRIPTION]
Sorting (quicksort and insertion) require strict orders and now
work with arrays of more than 2^32 elements.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Integer sets can now be initialized from integer argument arrays.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: Chris Mears
[DESCRIPTION]
Output operators (<<) now respect formatting width and work with
output streams using arbitrary character types.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Made macros semicolon-safe.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Fixed constructors for set variables. They now throw proper exceptions when 
trying to create empty variable domains.

[ENTRY]
Module: set
What:   new
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Added reified propagators constraining an integer variable to be the minimum 
or maximum element of a set variable.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
Support for PropKind has been removed for all but extensional constraints.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Domain constraints (dom) also accept integers now.

[ENTRY]
Module: other
What:   change
Rank:   major
Thanks: Max
[DESCRIPTION]
All operators are now in their correct namespace.

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
LinExpr, LinRel, BoolExpr are now part of the Gecode namespace
rather than Gecode::MiniModel (to support operator resolution).

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Tests for testing claims of bounds(Z) and bounds(D) consistency. These
tests would have found the bug in the binary min and max propagators.
[MORE]
An integer test can enable these new tests by setting the contest member
to CTL_BOUNDS_Z or CTL_BOUNDS_D. For domain-consistency propagators
the contest member is set automatically to CTL_DOMAIN. If no
consistency-testing should be done, contest should be set to CTL_NONE.

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
The search engines now collect statistics for the number of nodes
visited and the maximum depth of the search tree. The information
for number of clone and commit operations has been removed as it
was too confusing.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Search engines have been completely reimplemented.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jonathan Cederberg
[DESCRIPTION]
The binary min and max propagators did not do all pruning they
should do.
[MORE]
Given the constraint x = max(y,z) with the store {x->{1,2,3},
y->{1,2}, z->{3}}, propagation did not yield any new information
(now it gives the correct result {x->{3}, y->{1,2}, z->{3}}).

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: the steel mill slab design problem (Problem 38 in <a
href="http://csplib.org">CSPLib</a>).
[MORE]
The model used is from Gargani and Refalo, "An efficient model and
strategy for the steel mill slab design problem.", CP 2007. The
symmetry-breaking search is from Van Hentenryck and Michel, "The Steel
Mill Slab Design Problem Revisited", CPAIOR 2008.

[ENTRY]
Module: iter
What:   bug
Rank:   minor
Thanks: Stefano Gualandi
[DESCRIPTION]
Fixed init method of SingletonAppend range iterator.

[ENTRY]
Module: example
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug in the extensional propagation-version of the domino example.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
For the Microsoft compiler, auto-link information is added during
compilation.
[MORE]
That is, by including %Gecode headers during
compilation the right libraries will be found automatically
during linking. To simplify development and deployment, the
libraries (and DLLs) encode version, platform, and build type
(release or debug) in their filename.

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
[DESCRIPTION]
Posting constraints according to Boolean expressions now uses a
negation normalform and by this avoids any propagator for
negation and uses fewer propagators due to the new clause constraint.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Changed naming scheme for files. 
[MORE]
All files with extension .cc have been renamed to .cpp, and .icc
has become .hpp. This avoids conflicts as .icc is typically used
for other file types. All include directives are now specified
using <...> notation instead of "...", so that %Gecode headers do
not clutter the include namespace of a client program.

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
The Matrix class is now in the Gecode namespace (and not in
Gecode::MiniModel).

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Reorganized the internal data structures of set variables so that each 
variable takes up 8 bytes less memory on 64 bit machines.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The index structure for variable dependencies is now implemented using integers
instead of pointers, saving memory on 64 bit machines.
[MORE]
For example, the index 
structure of integer variables is now 40% smaller, for Boolean variables 
(which have the smallest possible index structure) we still save 16%.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added a Boolean clause constraint that supports conjunction and
disjunction of both positive and negative variables.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Now n-ary Boolean disjunction and conjunction are constant time
(rather than linear time, as before), even when a variable for
the result is used.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
%Gecode now supports weakly monotonic propagators. 
[MORE]
A weakly monotonic propagator must only be able to decide for
assignments whether they are solutions or not (which is a very
natural property as it means the propagator must be a correct
implementation of a constraint). Otherwise, the propagator does
not have to be monotonic, it can even be indeterministic.

Weakly monotonic but not monotonic propagators must notify a
space about their existence: if a weakly monotonic propagator is
created, it must execute "home.notice(*this,AP_WEAKLY)"; if it is
disposed, it must execute "home.ignore(*this,AP_WEAKLY)".

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The functions force and unforce of an actor to force disposal
have been removed. 
[MORE]
Now, the new interface based on notice and ignore using actor
properties must be used instead. So, instead of "force(home)",
write "home.notice(*this,AP_DISPOSE)" and, instead of
"unforce(home)", write "home.ignore(*this,AP_DISPOSE)".

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The incremental extensional propagator for tuplesets uses less
memory (around 25%) and reports its size correctly.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The element propagator for integer arrays now chooses
datastructures according to and the elements of the array.
[MORE]
This can save more than 80% memory on a 64 bit machine, and up to
75% on a 32 bit machine. In common cases, one can expect a
reduction by at least 50%.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The regular propagator now chooses datastructures according to
the size of the DFA. This can save up to 80% memory on a 64 bit
machine, and still up to 50% on a 32 bit machine.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The home space is now also passed to the cost function of a propagator.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Now everything is passed as reference (Space, Propagator,
ModEventDelta, Advisor, Branching, and BranchingDesc). 
[MORE]
The reason for this massive change is to be more C++ compliant
and make the interfaces more consistent (at some places things
were passed as references and at other places as pointers, for no
obvious and explainable reason). Routines that create objects
rather than pass them (such as copy, clone, or description) still
return a pointer to an object (so that it can actually be
deleted!).

You will have to rewrite your models and other programs using
%Gecode. For models this is easy enough:
 - Replace "(Space* home" by "(Space& home".
 - Replace "home->" by "home.".
 - Replace "(this" by "(*this".
 .
That should do the trick for 99% of the models.

For the other changes, just lookout for the changes in types and
that "this" becomes "*this" now.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
The memory management has been completely reworked. 
[MORE]
It is now more robust, more portable (does not use alloca any
longer), more efficient, fits C++ better and is much easier too
understand. There are now three memory areas: a single heap,
spaces, and regions. Heap and spaces are as before. A region (an
object of class Region) is a simple and very efficient memory
manager for temporary memory managed in a stack fashion. These
three memory managers provide uniform operations for allocation
(alloc), deallocation (free), and reallocation (realloc). These
operations use constructors, destructors, and assignment
operators as required by C++ and are implemented with efficient
specializations for basic data types.

[ENTRY]
Module: support
What:   removed
Rank:   minor
[DESCRIPTION]
PQueue has been removed (too specialized to be reused anyway).

[ENTRY]
Module: support
What:   removed
Rank:   minor
[DESCRIPTION]
GECODE_AUTOARRAY has been removed. Use a Region for memory
management instead.

[ENTRY]
Module: support
What:   removed
Rank:   minor
[DESCRIPTION]
GECODE_AUTOSTACK and SentinelStack has been removed. Use
StaticStack instead.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Simpler and more efficient memory management for element
propagators (integer arrays).

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
All functions for checking sharing for arrays (same, shared,
unique) require a space argument (for memory management).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added MinimizeSpace and MaximizeSpace classes for cost-based
optimization (requires implementing a cost function returning an
integer cost variable). Optimization can now be implemented by
inheriting from these classes rather than from Space and by
implementing a cost function.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The description() member function of a space is not any longer
const: it can be called at most once.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The constrain method used for best solution search must be
virtual and takes an argument of type const Space& rather than
Space* as argument.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Tie-breaking and random selection for branch is now supported.

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
The values for variable and value selection for branching have
been made consistent and extended. 
[MORE]
The following values have been renamed:
 - SET_VAR_MIN_CARD -> SET_VAR_SIZE_MIN
 - SET_VAR_MAX_CARD -> SET_VAR_SIZE_MAX
 - SET_VAR_MIN_UNKNOWN_ELEM -> SET_VAR_MIN_MIN
 - SET_VAR_MAX_UNKNOWN_ELEM -> SET_VAR_MAX_MAX
 - SET_VAL_MIN -> SET_VAL_MIN_INC
 - SET_VAL_MAX -> SET_VAL_MAX_INC
 .
Tie-breaking and random selection is now supported.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The variable selection INT_VAR_DEGREE_MIN and INT_VAR_DEGREE_MAX
do not have tiebreaking with smallest domain size built in.
[MORE]
The old behavior can be reclaimed by explicit tiebreaking, for
example replace INT_VAR_DEGREE_MAX by
tiebreak(INT_VAR_DEGREE_MAX,INT_VAR_SIZE_MIN).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
View and value branchings have been completely reimplemented to support
tie-breaking and state (for randomized selection).

[ENTRY]
Module: kernel
What:   removed
Rank:   major
[DESCRIPTION]
View and value assignments have been removed as they now can be
expressed by view and value branchings.


[RELEASE]
Version: 2.2.0
Date: 2008-08-25
[DESCRIPTION]
This release adds many domain consistent propagators for
arithmetic constraints and fixes a number of bugs. Some of these
bugs fixed are potentially serious, in particular as they occur
very seldom. Please change to 2.2.0 as soon as possible (in
particular if you are using the 64bit Microsoft Visual C++
compiler). And, of course, the usual small fixes and changes.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a bug in the memory alignment on Windows 64bit (very hard to reproduce).
	
[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
Added configure options for adding a prefix and a suffix to the names of the 
compiled libraries.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a bug in the domain consistent distinct propagator that would cause
a stack overflow under rare circumstances.
	
[ENTRY]
Module: set
What:   bug
Rank:   major
[DESCRIPTION]
The ternary intersection propagator was incorrect if any of the sets had a 
maximum cardinality of Set::Limits::card.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks:	Raphael Reischuk
[DESCRIPTION]
The attempt to access the value of an unassigned integer or
Boolean variable (IntVar or BoolVar) throws an exception now.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added bounds consistent division/modulo propagator.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
All functional linear and arithmetic constraints now put sharp
bounds on the output variable (eases interfacing to modelling
languages).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
The channel constraint now comes in a version that allows to specify offsets 
to the array indices.

[ENTRY]
Module: example
What:   removed
Rank:   minor
[DESCRIPTION]
Example-based support for SAC (singleton arc consistency) has
been removed. Might be reintroduced later in a more general
fashion.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
The Makefile has a new target, check, which performs a minimal integrity check 
using some tests from the test suite.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
The set selection constraints are now called element.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug for domain-consistent distinct that never occurred in
practice.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug that could potentially have affected certain staged
propagators.

[ENTRY]
Module: kernel
What:   documentation
Rank:   minor
Thanks:	David Rijsman
[DESCRIPTION]
Fixed explanation of ES_FIX and ES_NOFIX for advisors
(description was mixed up).

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The configure script now always uses the Microsoft compiler on Windows. Use
the CC and CXX environment variables to override this if you want to use
gcc.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent multiplication propagator.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks: Filip Konvicka
[DESCRIPTION]
Generated variable stubs were wrong (could only be observed for
new variable types).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: David Rijsman
[DESCRIPTION]
Cumulatives did not do all the pruning it should do.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in element with IntArgs and sharing between the two IntVars.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jaroslav Mlejnek
[DESCRIPTION]
Fixed bug in sqrt.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: David Rijsman
[DESCRIPTION]
Fixed bug in ValSplitMin::branchingSpec.

[ENTRY]
Module: kernel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed ViewTuple. Just not useful enough...

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Cleaned up Reflection::Var type, overloading did not conform to the C++ 
standard.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent minimum (min) and maximum (max) propagators.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent square root propagator (sqrt).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent squaring propagator (sqr).

[ENTRY]
Module: int
What:   documentation
Rank:   minor
[DESCRIPTION]
Added documentation for domain consistent absolute value (abs) propagator.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added reified propagators for relations over Boolean variables.

[RELEASE]
Version: 2.1.1
Date: 2008-03-06
[DESCRIPTION]
This is a bugfix release.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Non-shared copying of dfa was broken (matters only for parallel execution).

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
The generated med_updated function was incorrect, resulting in potential
crashes of programs that use SetVars.

[ENTRY]
Module: cpltset
What:   documentation
Rank:   minor
[DESCRIPTION]
The CpltSet variables are now in the correct documentation group.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed redraw artefacts on Windows.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed boost serialization.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Made the constructor of Reflection::Var explicit, otherwise overloading for
output stream operators does not work as expected.


[RELEASE]
Version: 2.1.0
Date:    2008-02-29
[DESCRIPTION]
This release makes two essential contributions: a partly
reimplemented kernel that is faster, is simpler, and uses less
memory and lots of small and not so small fixes. This release is
the first release where really everything that we can test
(rather than everything that we initially believed to matter) has
been systematically tested. So, better switch now to 2.1.0!

Apart from that, the value range for variables has been increased
(basically, 32 bits minus three values, so that is 32 bits), the reflection 
API is now fully functional and no longer considered experimental, and we have
the usual small additions.


[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added interface to extensional constraints defined by TupleSets with
BoolVars.

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
[DESCRIPTION]
Reimplemented linear expressions from scratch, they were just
hopelessly screwed.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
Added work-around for compiler bug in MSVC.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Support reified linear expressions with Boolean variables.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Throw an exception if variables occur multiply for array-based
channel constraints.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed multiplication propagator for x*y=x.

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
All search engines now take an option value for configuration
instead of individual arguments for recomputation, stop objects,
etc.

[ENTRY]
Module: minimodel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed scheduling abstractions.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
Removed extensional constraints with offset arguments.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
All minimodel functionality now understands both IntConLevel and
PropKind arguments.

[ENTRY]
Module: set
What:   bug
Rank:   major
[DESCRIPTION]
Fixed bugs in several set constraints:
rel(Space*,SetVar,IntRelType irt,IntVar) for irt=IRT_NQ,
rel(Space*,SetVar,SetOpType sot,const IntSet&,SetRelType srt,SetVar) for 
sot=SOT_MINUS, srt=SRT_SUP, selectDisjoint, selectUnion with constant IntSet 
arguments, dom with SRT_NQ.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in unreflection of empty VarArrays.

[ENTRY]
Module: linear
What:   bug
Rank:   major
[DESCRIPTION]
Fixed overflow checking error in linear constraints.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added sqrt function.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added sqrt propagator.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added sqr post function.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
The overloaded versions of dom for variable arrays could not be
resolved automatically.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added missing branching for INT_VAR_SIZE_DEGREE_MIN and
INT_VAR_SIZE_DEGREE_MAX for Boolean variables.

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
Thanks:	Stanimir Dragiev
[DESCRIPTION]
Fixed bug in posting linear expressions.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
IntSet have been reimplemented for efficiency.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Function prototypes are now highlighted in the detailed function documentation.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
The offset arguments for element constraints have been removed, as you can 
simply add dummy elements to the array to achieve the same effect.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
The offset arguments for selection constraints have been removed, as you can 
simply add dummy elements to the array to achieve the same effect.

[ENTRY]
Module: other
What:   new
Rank:   major
[DESCRIPTION]
The serialization library now contains a registry of all the %Gecode post 
functions. This makes interfacing to %Gecode much easier. The registry is 
automatically generated from the post functions defined in gecode/int.hh and 
gecode/set.hh.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Cleaned up reflection. Unreflection is now part of the kernel instead of the 
serialization library. Branchings now provide a human-readable description of 
a BranchingDesc. The name function of a Propagator has been renamed to ati 
(actor type identifier). All reflection is now const where possible. 
Unreflection of variables now checks dynamically that the variable types 
match. Unreflection of propagators checks the number of arguments. A 
tutorial-style section on reflection has been added to the documentation.

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
The limits for set variables have been moved from Limits::Set to
Set::Limits.

The range of set variables has been adapted to the range of
integer variables.  For example, on a standard machine
(regardless of 32 or 64 bits), a set can hold values from -2^30+2
to 2^30-2, its maximum cardinality therefore is 2^31-3.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
The limits for set variables have been moved from Limits::Set to
Set::Limits.

The range of integer variables have been extended by one bit. For
example, on a standard machine (regardless of 32 or 64 bits), the
largest possible integer value for an integer variable is 2^31-2,
the smallest -2^31+2. With other words, only the integer values
2^31-1, -2^31, and -2^31+1 are missing from the two-complement
representation (and we will never use these values for the sake
of mental sanity. We promise.).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Distinct with integer offsets checks accurately for overflow now.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Boolean variables consume 20% less memory.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Only stable and non-failed spaces can be cloned, otherwise
Space::clone raises an exception. This makes cloning and
propagation fully orthogonal. To emulate the old behavior, just
execute Space::status before Space::clone.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The number of propagators and branchings can be accurately
retrieved from both failed and non-stable spaces.

[ENTRY]
Module: examples
What:   new
Rank:   minor
[DESCRIPTION]
Added an example that interprets a JavaScript program and runs a search of the 
model that the program encodes. This is an example of how to use the 
JavaScript interpreter. A simple JavaScript model for n-Queens has been added, 
too.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
A generic variable class has been added that can be used for interfacing. It 
can store arbitrary %Gecode variables (e.g. IntVar and SetVar), and cast them 
back using a run-time type check. The update, reflection, and output 
operations are implemented through the reflection registry.

[ENTRY]
Module: other
What:   new
Rank:   major
[DESCRIPTION]
(De-)Serialization to and from JavaScript added.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Both the cost and propagate function of a propagator take the
current modification event delta as input. Likewise,
retrieving the modification event for a particular View must use
the static function View::me with the passed
modification event delta. Again, this feature committed the kernel to a
particular implementation which might not be available in the
future.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Views and variables do not any longer reveal whether they have
been modified: this feature committed the kernel to a particular
implementation which might not be available in the future.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Simple Singleton Arc Consistency pre-processing has been added as an
optional step for examples.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The kernel has undergone some cleanups and improvements (much of
it got actually reimplemented):
 - Automatically generated stubs for variable implementations are directly
   inlined into the kernel. This improves performance, but more
   importantly, lifts some limits on the number of variables. Now, the
   only limit is that the sum of the ceiling of the logarithms of the 
   number of modification events of all variables does not exceed 32
   (as an estimate, the kernel now can handle around 10 to 16 variable
   types). Moreover, if the need for more variable types arises this is 
   straightforward to do.
 - The addition of new variable types for users has been simplified.
 - The main propagation loop has been entirely rewritten (much much simpler).
   Now, the kernel does not optimize any longer for the case that a
   variable is modified more than once during propagator execution.
   While this changes the asymptotic complexity, it reduces the propagator
   execution overhead by up to 30%. And a propagator is still free
   to make sure that a variable is modified only once (many propagators
   do that already).
 - Variable implementations became smaller by one word. Now variable
   implementations are optimal in the sense that no additional memory
   is needed for cloning or book-keeping, the memory required for 
   propagation is sufficient.
 - Spaces have lost some weight as memory for datastructures only used
   during cloning or propagation are shared (saves some 25% of memory
   per space).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Propagator modification events have been renamed to modification event
deltas (because that is what they are).

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
To not confuse variable implementations with variables, variable
implementations are now always called VarImp, and not Variable.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
The %Gecode Interactive Search Tool (Gist), a Qt-based graphical search 
engine, is now part of the main %Gecode distribution. It is currently included
as an experimental beta preview and may not be completely stable yet.


[RELEASE]
Version: 2.0.1
Date:    2008-02-07
[DESCRIPTION]
This is a bug-fix only release. Very unfortunately, it fixes
three serious bugs in search (LDS, Restart, and assignment
branchings). We highly encourage you to switch to Gecode 2.0.1 as
soon as possible.

[ENTRY]
Module: test
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in reflection tests.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in set projection propagators.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in IntSet.

[ENTRY]
Module: test
What:   new
Rank:   major
[DESCRIPTION]
Added comprehensive tests for all search engines.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Assignment branchings wrongly reported that they feature two alternatives
rather than one.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Stefano Gualandi
[DESCRIPTION]
LDS had numerous quirks. It has been fixed and greatly improved:
it detects when the entire search tree has been probed,
independent of the maximal discrepancy.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Stefano Gualandi
[DESCRIPTION]
Restart was broken in case the problem failed immediately with
propagation only, both when being initialized or when requesting
a next solution.

[ENTRY]
Module: iter
What:   bug
Rank:   minor
Thanks: David Barton
[DESCRIPTION]
Changed Ranges::Diff to make older versions of gcc happy.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: David Barton
[DESCRIPTION]
Fixed linking order so that static linking works again.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks:	Mohamad Rabbath
[DESCRIPTION]
Re-added reified linear constraints for Boolean variables.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Domain-consistent abs could crash in certain (extremely rare) border cases.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Static initialization order was undefined, making reflection work unreliably. 
In particular, linking Gecode statically did not work.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Initializing an IntVar with an empty IntSet did not throw the appropriate 
exception but crashed.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Exceptions did not have rtti information when compiled with gcc and 
visibility, which meant that they could not be caught.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks:	Helmut Simonis
[DESCRIPTION]
Fixed a bug and quirk in %Kakuro puzzles.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The VarMapIter can now return both a specification and the actual VarBase* of 
the currently iterated variable.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Revived boost serialization.  The serialization functions will be compiled if 
Gecode is configured with --with-boost.

[ENTRY]
Module: kernel
What:   performance
Rank:   minor
[DESCRIPTION]
Be less aggressive in increasing size of heap chunks.

[ENTRY]
Module: int
What:   documentation
Rank:   minor
[DESCRIPTION]
Fixed bug in documentation of table-based extensional constraint.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug in the hash function for pointers, which could return
negative array indices.



[RELEASE]
Version: 2.0.0
Date:    2007-11-14
[DESCRIPTION]
As witnessed by the version number change, this is a major
release with too many changes, fixes, and additions to mention
them all: please consult the changelog.

The highlights are:
 - New propagators: channeling between Integer variable and array
   of Boolean variables, circuit, table constraint (extensional),
   incremental regular constraint (extensional), incremental
   Boolean linear constraints
 - Boolean variables have a dedicated implementation: twice as
   fast, half the memory
 - Advisors for incremental propagation (see: Lagerkvist,
   Schulte, Advisors for Incremental Propagation, CP 2007)
 - Many crucial performance and scalability improvements: memory
   management, memory footprint of propagators
 - Many cleanups and more documentation, many new examples
 - New set variables with complete domain representation
   (CpltSetVar) [experimental]
 - A reflection API to query spaces about their propagators
   [experimental]

The features marked as experimental are all functional, but might
be revised in the next releases.
 
As %Gecode 2.0.0 is a major release, you might have to adapt your
programs:  \ref PageHowToChange_2 "How to Change to Gecode 2.0.0".

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added table-based extensional constraint.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
When compiling with gcc, the default visibility of symbols in the
generated dynamic library is set to hidden.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
Removed buggy distinct propagator for finite sets.

[ENTRY]
Module: example
What:   new
Rank:   minor
Thanks:	Helmut Simonis
[DESCRIPTION]
New example: %Kakuro puzzles.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Added dist and distdir targets for creating source distribution.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Filip Konvicka
[DESCRIPTION]
On windows with MSVC, always build program database files to ease
debugging of applications using %Gecode (files are also included in
packages).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added new variable selection based on largest or smallest
quotient of size and degree.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
Variable arrays, view arrays, and argument arrays can directly be
printed on standard output streams.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The structure of includes has been drastically
simplified. Support for iterators ("gecode/iter.hh") is
automatically included with integers ("gecode/int.hh") and sets
("gecode/set.hh"). Likewise, all support functionality becomes
available by including "gecode/support.hh" (one can assume that
this is included in "gecode/kernel.hh").

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Shared arrays are now available in the kernel (where they properly
belong). This entails that they are available in the Gecode
namespace and not in Gecode::Support.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The extensional constraint specified by a DFA or a regular
expression (formerly known as regular) is now named "extensional"
rather than "regular".

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed small quirk in posting an absolute propagator via a function.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added channeling propagator between a SetVar and a BoolVarArray
that propagates the characteristic function of the set to the
Boolean variables.

[ENTRY]
Module: set
What:   performance
Rank:   minor
[DESCRIPTION]
Changed the datastructure for set variables to use singly-linked
lists.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The values (and types) for selecting how to branch have been made
uniform for all variables types: they start with INT_ (or SET_ or
CPLTSET_), followed by either VAL or VAR and the respective
strategy.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The interface for the global cardinality constraint has been simplified.
The constraint is now called count.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Regular expressions (REG) have been moved from the integer module to
the minimodel module.

[ENTRY]
Module: example
What:   change
Rank:   major
[DESCRIPTION]
Most examples have been cleaned up.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Parsing of commandline arguments has been completely redone and
is much more extensible and flexible.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
All of %Gecode has been put under the MIT license (which the
previous license was a simple rewording of).

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Removed huge number of casts that could (only potentially)
compromise portability.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Finite set projectors can now be specified using formulas, in addition to
set expressions.

[ENTRY]
Module: cpltset
What:   new
Rank:   major
[DESCRIPTION]
Finite integer set variables with complete domain representation,
based on binary decision diagrams (BDDs), have been added as a
new variable type.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
A reflection API has been added, which allows querying spaces 
about the variables and propagators they contain.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Branching ids were not properly initialized. This was a serious
problem if you posted branchings in spaces other than the root
space.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Iterator-based domain operations have been renamed,
reimplemented, and extended. Now operations for both range and
value iterators are supported and the operations can be told to
perform more efficient destructive updates.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Sortedness constraints have been renamed to sorted constraints.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
VarArrays can now be resized dynamically.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Boolean linear equations and inequalities with constant
right-hand sides use constant time propagators whenever
appropriate (linear time with less overhead and memory for
propagators with few variables).

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added advisors as an abstraction for incremental propagation:
advisors are executed for their propagator whenever their view
changes. Advisors, when not being used, add one word of overhead
to each variable and slow down the system in the worst case by
less than 1%. In average, no slowdown can be observed.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a border-case bug for n-ary Boolean conjunction and disjunction.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
A new propagation condition PC_GEN_NONE (and hence, PC_INT_NONE,
...) has been introduced. Propagator patterns with this
propagation condition now do not create any subscriptions.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
The regular constraint has been reimplemented, the new version
runs more than twice as fast.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added a model for the traveling salesman problem, mostly
intended to exercise the new circuit constraint (as the model is not
very competitive).

[ENTRY]
Module:	kernel
What:	new
Rank:	major
[DESCRIPTION]
Support for reference-counted shared objects added: they handle
both reference counting as well as non-shared copying. This fixes
some bugs with the handling of shared arrays, integer sets, and
finite automata.


[ENTRY]
Module:	example
What:	bug
Rank:	minor
[DESCRIPTION]
Examples reported wrong number of propagator invocations (the
invocations for problem setup were missing).

[ENTRY]
Module:	kernel
What:	new
Rank:	major
[DESCRIPTION]
Added classes for shared objects and handles. Handles to shared
objects allow to either share copies among spaces when being
copied or to create a new shared copy, if requested.

[ENTRY]
Module:	int
What:	new
Rank:	minor
Thanks:	Martin Mann
[DESCRIPTION]
Added a new version of count (and also atleast, atmost, exactly)
that counts the number of variables equal to integers in an
array.

[ENTRY]
Module:	example
What:	bug
Rank:	minor
Bug:	50
[DESCRIPTION]
The number of colors in graph-color was off by one.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added channel constraints that channel an integer variable to
either a single or an array of Boolean variables.

[ENTRY]
Module:	int
What:	bug
Rank:	minor
[DESCRIPTION]
Fixed bug in copying of n-ary or-propagator for a special boundary case.

[ENTRY]
Module:	int
What:	new
Rank:	minor
[DESCRIPTION]
Relaxed sharing restrictions for channel, in particular 
channel(this, x, x) is allowed.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added propagators for the circuit constraint.

[ENTRY]
Module:	kernel
What:	performance
Rank:	minor
[DESCRIPTION]
Improved automatic memory management on Windows platforms.

[ENTRY]
Module:	int
What:	performance
Rank:	minor
[DESCRIPTION]
Domain consistent distinct and channel allocate memory from the
space heap now. Much simpler.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
The Boolean tell operations one_none and zero_none now also
return a ModEvent and hence must be checked for failure. This is
needed for simpler advisors.

[ENTRY]
Module:	kernel
What:	performance
Rank:	major
[DESCRIPTION]
The memory management policies have been completely reworked. Now
memory requests are much more regular. Hence, memory is much more
likely to be returned to the operating system. Furthermore, the
flush member functions for actors have been removed (they were
unneeded) and actors and spaces now have allocated member
functions for returning how much memory is allocated by a space.

Moreover, the memory reported by some propagators has been
ignored. Note that this flaw did not affect the benchmark figures
on the %Gecode webpage.

[ENTRY]
Module:	int
What:	performance
Rank:	minor
[DESCRIPTION]
The multiplication uses integer precision if possible for better
performance.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
Integer and Boolean variables are now guaranteed to be
inspectable (that is, all const member functions work on them),
even though a space is failed. However, the variables might have
been modified during a tell operation that has failed.

[ENTRY]
Module:	minimodel
What:	change
Rank:	major
[DESCRIPTION]
Linear expressions and relations can also be created from Boolean
variables, with the restriction that Boolean relations cannot be
reified.

[ENTRY]
Module:	int
What:	change
Rank:	major
[DESCRIPTION]
Boolean variables (and hence Boolean views) do not any longer
share the implementation with integer variables. That has the
following consequences:
- Boolean variables are not any longer integer variables. The same
  holds true for arrays of variables.
- All constraints that make sense for both Boolean and integer
  variables have post functions that support both integer and
  Boolean variables.
- Memory for Boolean variables is reduced by 50% and performance
  increases in problems with many Boolean variables by up to 50%.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added propagators for linear constraints over Boolean variables,
in particular specialized and efficient versions for non-unit
coefficients.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
The linear constraints are now more careful (that is, they will
use more efficient versions more often if it is safe) to
determine whether overflow occurs and which precision (integer or
double) should be chosen.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
The element constraints now accept an additional offset argument.

[ENTRY]
Module:	set
What:	new
Rank:	minor
[DESCRIPTION]
Added selection and reified relation constraints with constant sets.

[ENTRY]
Module:	set
What:	change
Rank:	minor
[DESCRIPTION]
Slightly stronger inferences for the finite set sequence and selection
constraints.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: the balanced academic curriculum problem (problem 030 from
CSPlib).

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed the n-ary partition propagator to handle overflow of the sum of
cardinalities correctly.

[ENTRY]
Module: kernel
What: 	bug
Rank: 	minor
[DESCRIPTION]
Subscription to constant views now should use the propagate
member function from a variable implementation: it guarantees
execution of a propagator at least once (int and set views have
been adopted accordingly).

[ENTRY]
Module: int
What: 	bug
Rank: 	major
Bug:	48
[DESCRIPTION]
Branching on maximum regret would always crash on non-range domains.

[ENTRY]
Module: set
What: 	change
Rank: 	minor
[DESCRIPTION]
The finite set selection propagators accept an additional
argument that specifies where the indexing should start. It
should make some models more natural to express, and helps in
porting code from other systems, such as Prolog or Mozart.  In
addition, the selectUnion propagator is now hand-written again,
resulting in better performance.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
All Boolean constraints got a new and regular interface. Rather
than providing different post functions for the different
constraints, the single post function rel is used: the Boolean
operation then is described by a value of type BoolOpType. In
addition, all Boolean propagators have been reimplemented for
better performance and less memory use.

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Added simple testing for branchings.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The way how propagators report subsumption and partial fixpoints
has changed. Now, a propagator must first call dispose (which
then cancels subscriptions and possibly frees external resources)
and only then can return that the propagator is subsumed. For
that purpose a new function Gecode::ES_SUBSUMED has been
defined. Likewise, ES_FIX_PARTIAL and ES_NOFIX_PARTIAL are
functions rather than member functions of Gecode::Propagator. The
benefit is that this saves memory and is more efficient.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The use of the consistency options were a little confusing, now
the rule is: the level of consistency increases from ICL_VAL to
ICL_BND to ICL_DOM.

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
[DESCRIPTION]
Boolean expressions erroneously decomposed into ternary Boolean
constraints, while not incorrect rather inefficient for large
Boolean expressions.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Made all macros type safe.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added macro GECODE_REWRITE for rewriting propagators. It is strongly advised
to always use this macro!

[ENTRY]
Module: example
What:   bug
Rank:   minor
Bug:    46
[DESCRIPTION]
Orientation of Sudokus now match the orientation in the specification-file.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: MineSweeper.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: Domino.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Set projectors could subscribe with bogus propagation conditions.

[ENTRY]
Module: set
What:   performance
Rank:   minor
[DESCRIPTION]
Performance of the tell operations on finite set variables was
improved.  Especially the intersect operation benefits from this.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
The element constraint now also supports integer values as result.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Add a generic class for assignments during search (similar to
generic branchings for views and values).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
All branching classes for value and view selection are now
parametric.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Boolean variables cannot longer be initialized from an integer 
variable. If needed, a channel propagator must be posted (added).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The equality constraints have been replaced by a variant of rel.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The propagator abstractions Inhom* have been renamed to Mix*.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The operations t_one, t_one_none, t_zero, t_zero_none for Boolean
views have been renamed to one, one_none, zero, zero_none.

[ENTRY]
Module: kernel
What:   performance
Rank:   major
[DESCRIPTION]
Explicit disposal of actors has been reimplemented (the old
design was nothing but darn stupid). The memory overhead of
propagators is reduced by 40% for most propagators and 20% for
all. That is, a binary propagator takes 30% less memory and a
ternary propagator takes 25% less memory. Programs with many
binary or ternary propagators can run up to 20% faster.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Propagators and branchings that require disposal when a space is
deleted must now be explicitly registered via a force function
and explicitly deregistered by an unforce function.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in reified dom constraint.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in distinct constraint for sets.

[ENTRY]
Module: example
What:   new
Rank:   major
[DESCRIPTION]
New example: Pentominoes. The example uses extensional
constraints specified as regular expressions to place
irregular-shaped pieces on a board.



[RELEASE]
Version:	1.3.1
Date:		2006-10-25
[DESCRIPTION]
This is a minor release which fixes a major bug (the first real
serious bug). Please update as soon as possible.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks: Rafael Meneses
[DESCRIPTION]
Branch&Bound search with ViewValBranchings (all standard branchings) together 
with batch recomputation was severely broken. The problems ranged from wrong 
search trees (missing solutions) to segmentation faults. The fix changes the 
way assigned variables are removed from the array in a ViewValBranching.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Bounds-consistent distinct catches border case when an assigned variable
during bounds propagation leads to value removal for value propagation.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Bounds-consistent distinct eliminates assigned variables more 
aggressively (can save up to 10% runtime in some cases).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Alejandro Arbelaez
[DESCRIPTION]
IntVar::init now also raises exceptions for illegal domain specifications.





[RELEASE]
Version:	1.3.0
Date:		2006-09-19
[DESCRIPTION]
This release adds a compiler for finite set projectors and provides new
infrastructure making it easier to add new variable domains. In addition,
it contains recent bug fixes and minor improvements.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Compiler for finite set projectors. Given a specification of a finite set
constraint as a projector set, it generates C++ code for the corresponding
propagator. Together with the dynamic propagator for finite set projectors,
this implements the backend of the technique described in the paper
"Generating Propagators for Finite Set Constraints" (Tack, Schulte,
Smolka; CP 2006.).

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Jorge Marques Pelizzoni
[DESCRIPTION]
Also pass options for linking standard libraries for MSVC.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
The pkg-config files now contain the correct path if you configured to the
default prefix (i.e. /usr/local).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added aliases lex, atleast, atmost, and exactly for the count constraint.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Renamed lex constraint to rel (as it also supports equality and disequality).

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Make count constraints with integer number of equal occurrences
more incremental using dynamic subscriptions (gives a 20-30%
speedup).

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added an example for solving Black Hole patience games.

[ENTRY]
Module: kernel
What:   new
Rank:	major
[DESCRIPTION]
Subscription to variables now features an additional and optional
Boolean argument whether the propagator is to be processed. This
allows dynamically creation of subscriptions during propagation.

[ENTRY]
Module: other
What:   new
Rank:	minor
[DESCRIPTION]
New configure switches: --enable-audit to include audit code, which may
contain expensive checks of internal invariants or alternative, checked
implementations of critical parts of %Gecode. --enable-universal and 
--with-sdk, to support building universal binaries on Mac OS X.

[ENTRY]
Module: kernel
What:	new
Rank:	minor
[DESCRIPTION]
Variables can now be deallocated when the Space is deallocated (for example in 
case of failure). This is important in case a variable implementation needs to 
reference external resources. Deallocation can be switched on in the 
high-level description used for generating the variable implementation.

[ENTRY]
Module: minimodel
What:	bug
Rank:	minor
Thanks:	Rafael Meneses
[DESCRIPTION]
Under certain conditions (posting in a failed space), the post function 
returned uninitialized variables.

[ENTRY]
Module: kernel
What: 	performance
Rank: 	major
[DESCRIPTION]
Variable implementations are now generated from a high-level
description (taking care of all aspects relating to modification
events and propagation conditions). While simplifying the
implementation of new variable domains considerably, this also can, 
in lucky cases, deliver a speed-up of 5%.

[ENTRY]
Module: kernel
What: 	performance
Rank: 	major
[DESCRIPTION]
Allocate subscriptions in separate memory area. Can speedup execution
in some (but few) cases by up to 15-20%.

[ENTRY]
Module: int
What: 	documentation
Rank: 	minor
Bug:	43
[DESCRIPTION]
Fixed documentation problem due to doxygen...

[ENTRY]
Module: search
What: 	new
Rank: 	major
[DESCRIPTION]
Branch-and-bound search now interleaves recomputation with adding
bounding constraints. This can prune the search tree much
earlier: instead of recomputing many nodes from the same copy
node and then adding a constraint that fails all these nodes, it
might be possible to already fail the copy node directly. In
principle, the difference can be exponential, however for
examples we tried the effect is minor.

[ENTRY]
Module: kernel
What: 	bug
Rank: 	minor
[DESCRIPTION]
Now commits can be interleaved with adding new constraints during
batch recomputation. This also entails that commit does not raise
an exception when applied to an already failed space (it is
simply ignored). The bug could not be observed (unless you did
some very fancy search engines yourself) and one could actually
see it as an extension.




[RELEASE]
Version:	1.2.2
Date:		2006-07-25
[DESCRIPTION]
This release switches recomputation back on and removes some
experimental code that had sneaked into the system...

[ENTRY]
Module: kernel
What: 	performance
Rank: 	major
[DESCRIPTION]
Some experimental code had sneaked into the release, slowing down
the system by more than 10%...

[ENTRY]
Module: search
What: 	bug
Rank: 	major
[DESCRIPTION]
With the changes to search in %Gecode 1.2.1 recomputation was
actually almost switched off...

[ENTRY]
Module: int
What: 	performance
Rank: 	minor
[DESCRIPTION]
Improve performance of domain-consistent distinct (by providing
special ternary version). Can reduce runtime by 10-20% for some
examples.

[ENTRY]
Module: int
What: 	performance
Rank: 	minor
[DESCRIPTION]
Cut memory requirements for element (for integer arrays) by half.

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added stress test for element constraint (originally due to Neng-Fa Zhou).

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added stress test for min constraint.

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added possibility to stop the search for solutions in examples based
on the time taken, the number of fails, or both.

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added an example for solving Peacable co-existing armies of %Queens.



[RELEASE]
Version:	1.2.1
Date:		2006-07-19
[DESCRIPTION]
In addition to the usual fixes and improvements, the biggest
change is that all branchings now must support branching
descriptions. This also entails straightforward changes
(simplifications) to search-related space operations and to the
implementation of search engines.


[ENTRY]
Module: kernel
What: 	new
Rank: 	minor
[DESCRIPTION]
Added a macro GECODE_NEVER that assert that this command is never
executed.  This is preferred over assert(false) as it is used for
optimization, if supported by a compiler (for example, Microsoft
Visual C++).

[ENTRY]
Module: int
What: 	bug
Rank: 	minor
[DESCRIPTION]
Fixed fixpoint detection bug in n-ary min and max propagators.

[ENTRY]
Module: int
What: 	bug
Rank: 	minor
[DESCRIPTION]
Min and max propagators now correctly handle cases such as min(x,y)=x.

[ENTRY]
Module: int
What: 	removed
Rank: 	minor
[DESCRIPTION]
Removed bounds-consistent propagation for count constraint (not worth
the trouble, just use domain-consistent).

[ENTRY]
Module: kernel
What: 	change
Rank: 	minor
Thanks:	Martin Mann
[DESCRIPTION]
The ViewValBranching class now passes the home space to all member
functions used in selecting the view and the value.

[ENTRY]
Module: set
What: 	bug
Rank: 	minor
[DESCRIPTION]
Fixed fixpoint detection for n-ary partition propagator.

[ENTRY]
Module: set
What: 	new
Rank: 	major
[DESCRIPTION]
Added finite set projection propagators. They allow to propagate all
finite set constraints expressible as finite set projectors, including
negated and reified constraints.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Added simple class encapsulating a linear congruential pseudo-random
number generator.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The interface for branchings has changed considerably, reflecting
the fact now that all branchings must support branching descriptions.
This is also reflected in the Space::status operation which has its
arguments reversed and corrected const qualifiers on its arguments.
But the good news is that it is considerably simpler than before.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Assignment branchings (that is, branchings with a single alternative)
could possibly take the wrong values for assignment during recomputation.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The status operation does not any longer accept an argument for
the number of alternatives. The number of alternatives is now
available from a branching description (where it is passed upon
creation of the description). This reflects the fact that
branching descriptions are mandatory now.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a serious bug where during recomputation the search stack
was always inspected behind the last element: the reason why
recomputation never crashed has been that stacks always keep one
element extra for optimization. So, serious bug but looks as if
no one stumbled over this...

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
As Boolean variables can be derived from integer variables, the
assumption that a not yet assigned Boolean variable can not be
modified is wrong.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
[DESCRIPTION]
Generate one page per version released in changelog.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Bug:	41
[DESCRIPTION]
Change exceptions thrown by %Gecode to be compliant with C++
exceptions.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Bug:	42
[DESCRIPTION]
Renamed macros so as to avoid nameclashes (all macros start with
GECODE_).

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Search engines now correctly count the number of propagation
steps including propagation that occurs when adaptive
recomputation creates additional clones.

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
Branchings now must return branching descriptions and commit
operations also insist on being provided with branching
descriptions.  This change reflects that batch recomputation is
of vital importance for efficiency in %Gecode.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Make Boolean linear constraints with constant right hand sides
more incremental using dynamic subscriptions (gives a 20-30% speedup).

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
[DESCRIPTION]
Take advantage of specialized Boolean propagators in Boolean
expressions and relations.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Made n-ary Boolean conjunction and disjunction more incremental by
using dynamic subscriptions.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Provide special versions of Boolean propagators optimizing cases
where n-ary disjunctions are true.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Change implementation of Boolean propagators from conjunction
to disjunction so that disjunction can be used as special case
for Boolean sum with inequalities.


[RELEASE]
Version:	1.2.0
Date:		2006-06-20
[DESCRIPTION]
This release makes quite some drastic changes to how propagators
and branchings are deleted: instead of using destructors they use
a dispose method that allows passing a home space during deletion
(we will use this infrastructure measure to speed up cloning
considerably a little later). Moreover the directory structure
has changed on popular request so that all include files are to
be found in a gecode subdirectory. Apart from that, some small
fixes and extensions due to requests.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Luis Otero
[DESCRIPTION]
Fixed memory leak in finite set distinct propagator.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in global cardinality constraint.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Fixed bug in equality tests that could lead to reified (dis)equality
propagators not achieving domain consistency.

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Added --enable-leak-debug configure option. This option causes the test suite
to call mtrace() under Linux, which can be used to test for memory leaks.

[ENTRY]
Module: kernel
What:   performance
Rank:   minor
[DESCRIPTION]
More aggressive inlining for canceling subscriptions.

[ENTRY]
Module: search
What:   bug
Rank:   minor
Bug:	39
[DESCRIPTION]
Fixed linkage of BAB destructor under Cygwin.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The branch member function for branchings now also takes a home space
as argument.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Canceling subscriptions on views and variable implementations now
require also a home space (this has become possible due to not using
destructors but ordinary "dispose" member functions).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Actors (propagators and branchings) do not any longer use destructors
but a "dispose" member function that takes a home space as argument
and must return the size of the actor.
Important: this requires that dispose member functions from super-classes
and class members are called explicitly!
	
[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Spaces can be queried for number of propagators and branchings.
	
[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
Search engines can now be checked whether they have been stopped.
	
[ENTRY]
Module: int
What:   documentation
Rank:   minor
Thanks:	Martin Mann
[DESCRIPTION]
Fixed bug in description of PC_INT_DOM.
	
[ENTRY]
Module: other
What:   change
Rank:   major
Thanks:	Martin Mann
[DESCRIPTION]
Moved library source code into gecode subdirectory. Facilitates cleaner
installation. Programs compiling against %Gecode now need to include
e.g. "gecode/int.hh".
	
[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Sudoku example generalized to arbitrarily sized Sudokus.

[RELEASE]
Version:	1.1.0
Date:		2006-04-10
[DESCRIPTION]
This minor release adds some new constraints (see below), adds support
for stopping search engines based on definable criteria, and some other
small fixes. Most notably, the test infrastructure has been extended to
also check whether propagators correctly claim that they have computed
a fixpoint (now all invariants a propagator must obey in %Gecode are covered
by the test infrastructure). This has lead to many small fixes.
	
[ENTRY]
Module: other
What:   bug
Bug:    37
Rank:   minor
Thanks: Kari Pahula
[DESCRIPTION]
Added a configure switch --enable-doc-dot. If enabled, this checks for
presence of the dot tool (used for generating graphs in the documentation)
	
[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added all-interval series using distinct.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added functions returning variables for arithmetic 
(min, max, abs, mult, plus, minus).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Support for shared views has been removed in 
sortedness propagator and in the propagator 
for global cardinality with fixed cardinalities. 

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of sortedness and 
global cardinality propagator.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Bug:	36
Thanks: Javier Mena
[DESCRIPTION]
A non-debug version of %Gecode could not be linked to a program compiled with
assertions switched on, as BndSet::isConsistent was missing from the library.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Staged propagation for domain-consistent absolute value propagator

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
EqBnd and EqDom now take two template parameters for their view types. This
supports using different views, e.g. to express x0=-x1 using a MinusView.

[ENTRY]
Module: search
What:   new
Rank:   major
Thanks:	Rafael Meneses
[DESCRIPTION]
Added functionality to interrupt search engines (introduced
a Search::Stop class).

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
Removed search engines optimizing for copying only (after
all, one should always use some recomputation).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of n-ary maximum/minimum
propagator.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The status member function now also allows the first
argument to be optional.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bugs in fixpoint detection of several set propagators (match,
convexity, sequence, n-ary (disjoint) union).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of bounds-consistent 
element for variables propagator.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of bounds-consistent squaring
propagator (mult with the same variable twice).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of bounds-consistent abs
propagator.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Rewrite n-ary linear, min/max, and Boolean propagators to binary/ternary
variants during cloning if possible (saves memory).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Stefano Gualandi
[DESCRIPTION]
Fixed wrong assertion in gcc-bnd propagator.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Jean-Christophe Godart
[DESCRIPTION]
Fixed indexing bug in SupportSet (part of the domain consistent linear
equation propagator). 

[ENTRY]
Module: int
What:	new
Rank:	major
[DESCRIPTION]
Added new constraint channel for variable/value channeling
between two variable arrays.

[ENTRY]
Module: int
What:	change
Rank:	minor
[DESCRIPTION]
All distinct propagators raise an exception if a variable occurs
multiply in its arguments.

[ENTRY]
Module: set
What:	change
Rank:	major
[DESCRIPTION]
Renamed the set propagators minElement to min, maxElement to max,
and channelVarVal to channel.

[ENTRY]
Module: int
What: 	performance
Rank: 	major
[DESCRIPTION]
Improved initialization of domain-consistent distinct propagator,
in common cases for distinct this can save up to 10% runtime.

[ENTRY]
Module: set
What:	bug
Rank:	minor
Thanks: Patrick Pekczynski
[DESCRIPTION]
Fixed off-by-one bug in SetVarImp::lubMinN and SetVarImp::lubMaxN.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Olof Sivertsson
[DESCRIPTION]
(In-)Equations were still not correct with respect to the sign.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Bug:    33
Thanks: Olof Sivertsson
[DESCRIPTION]
Slice-operation now returns elements in right order.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Bug:    32
Thanks: Olof Sivertsson
[DESCRIPTION]
Possible array-out-of bounds access fixed for MiniModel::Matrix.

[ENTRY]
Module: example
What:   performance
Rank:   minor
[DESCRIPTION]
Added redundant constraint to social golfers example.




[RELEASE]
Version:	1.0.1
Date:		2006-03-01
[DESCRIPTION]
Maintenance release including some additions of domain-consistent
propagators and a fix for a serious bug in reified linear
inequalities.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
Changed default copying recomputation distance to 8.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Olof Sivertsson
[DESCRIPTION]
(In-)Equations with an int on the left hand side (like 9==x) were
translated with a wrong sign (as -9==x).

[ENTRY]
Module: other
What:   bug
Rank:   minor
Bug:    31
[DESCRIPTION]
The preprocessor macro NDEBUG for disabling assertions is no longer
put into config.hpp. Without this fix, user programs could not use
assert if %Gecode was compiled with NDEBUG.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
The post functions for linear expressions and relations also take
an integer consistency level as optional argument.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added domain-consistent linear equalities.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Bug:	30
[DESCRIPTION]
Fixed fixpoint detection for ternary min and max.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed subsumption detection for regular with multiple variable occurences.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Cost computation for sortedness has been changed from static to
dynamic (taking into account the variable reduction the
propagator can perform).

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Global cardinality changed to non-staged version.  Further
inference for cardinality variables added.  Parts of the graph
structure for the domain-consistent propagator have been revised
so as to avoid unnecessary propagation in case of fixed
cardinalities and to allow better staging for the
propagator. Revision of propagation for fixed cardinalities has
also been applied to bounds-consistent propagator.

[ENTRY]
Module:		int
What:		new
Rank:		major
[DESCRIPTION]
Added domain-consistent version of the absolute value propagator.

[ENTRY]
Module:		other
What:		performance
Rank:		major
[DESCRIPTION]
Switch assertions off in optimized builds with Microsoft's C++ compiler.

[ENTRY]
Module:		int
What:		bug
Rank:		major
Bug:		29
Thanks:		Dominik Brill
[DESCRIPTION]
Fixed a very serious bug in the reified linear inequality propagator.

[ENTRY]
Module:		other
What:		bug
Rank:		minor
Thanks:		Filip Konvicka
[DESCRIPTION]
Removed some compiler warnings for the Microsoft compiler with -W3.

[ENTRY]
Module:		int
What:		bug
Rank:		major
Bug:		27
[DESCRIPTION]
The strongly connected components represented by the permutation
variables in the extended version of Sortedness has been fixed
restoring bounds consistency on the permutation variables.

[ENTRY]
Module:		other
What:		change
Rank:		minor
Bug:		24
[DESCRIPTION]
The soname for libraries on Linux is now set properly, as well as the
version information on Darwin (Mac OS).

[ENTRY]
Module:		other
What:		change
Rank:		minor
Bug:		25
[DESCRIPTION]
The build system has been updated to support building both static and
shared libraries at the same time on Unix-like systems.

[ENTRY]
Module:		example
What:		change
Rank:		minor
[DESCRIPTION]
Examples now use per default the recomputation settings as
defined in the search module.

[RELEASE]
Version:	1.0.0
Date:		2005-12-06
[DESCRIPTION]
Initial release.