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<head>
<title>Stdlib Release Notes</title>
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<center><h1>Stdlib Release Notes</h1></center>
<!--- ################################################################# --->
<h2>Stdlib 1.10</h2>
<!--- ----------------------------------------------------------------- --->
<h3>Fixed errors and malfunctions</h3>
<ul>
<li>
The shell allowed patterns which did not have pattern syntax (for
example function calls); they became patterns which always failed to
match. Now they cause an exit instead, similar to unbound variables.<br>
(Own Id: OTP-3284)<p>
</li>
<li>
<code>dets:all/0</code> failed if it was called before any other dets
calls had been made.<br>
(Own Id: OTP-3621)<br>
(Aux Id: Seq 4590)<p>
</li>
<li>
In the documentation for <code>erl_lint</code> in OTP R6 and R7, the
prefix "warn_" for the optional warning options
<code>warn_unused_vars</code> and <code>warn_format</code> was left
out.<br>
(Own Id: OTP-3730)<p>
</li>
<li>
Spurious format warnings were given by <code>erl_lint</code> for
correct calls to <code>format/1</code>.<br>
(Own Id: OTP-3731)<p>
</li>
<li>
The hash function used in dict and sets is now erlang:phash/2 rather
than the broken erlang:hash/2.<br>
(*** POTENTIAL INCOMPATIBILITY ***)<br>
(Own Id: OTP-3802)<p>
</li>
<li>
In earlier releases of OTP, the manual entry for
<code>sys:change_code</code> was incorrect.<br>
(Own Id: OTP-3806)<br>
(Aux Id: Seq 5034)<p>
</li>
<li>
The functions in the <code>calendar</code> module now have better error
checking, exiting for type errors. In particular,
<code>is_valid_date/[1,3]</code> no longer return <code>true</code> for
any invalid dates.<br>
(Own Id: OTP-3925)<br>
(Aux Id: seq5187)<p>
</li>
<li>
c:memory/[0,1] could previously fail erroneously with a badmatch. This
problem has been solved.<br>
(Own Id: OTP-4017)<p>
</li>
<li>
Bug fix: <code>intersection/1</code> in the <code>sets</code> and
<code>ordsets</code> modules no longer accepts the empty list as
argument. The reason is that intersection of an empty set is undefined.<br>
(*** POTENTIAL INCOMPATIBILITY ***)<br>
(Own Id: OTP-4045)<p>
</li>
</ul>
<!--- ----------------------------------------------------------------- --->
<h3>Improvements and new features</h3>
<ul>
<li>
It is no longer necessary to set a seed explicitly before using
<code>random:uniform</code>; now <code>uniform:seed/0</code> will be
called automatically. In addition, new functions exist for handling
random numbers in a functional way.<br>
(Own Id: OTP-3104)<br>
(Aux Id: Seq 1681)<p>
</li>
<li>
New functions added to <code>beam_lib</code>: <code>cmp/2</code>,
<code>cmp_dirs/2</code>, <code>diff_dirs/2</code>,
<code>strip/1</code>, <code>strip_files/1</code>, and
<code>strip_release/1</code>. New chunks names recognized by
<code>beam_lib</code>: <code>labeled_exports</code> and
<code>labeled_locals</code>.<br>
(Own Id: OTP-3738)<br>
(Aux Id: OTP-2686)<p>
</li>
<li>
All functions in <code>beam_lib</code> module now accept a binary as
well as a filename.<br>
(Own Id: OTP-3760)<p>
</li>
<li>
The <code>dets</code> module has been partly rewritten.
<code>finsert/2</code> accepts a list of objects. <code>info/2</code>
accepts the new item tags <code>access</code>, <code>ram_file</code>
and <code>auto_save</code>, and the item tags <code>memory</code> and
<code>pid</code> have been documented. The read cache has been removed
and the <code>cache_size</code> option is ignored (incompatibility).
Many functions have been more efficiently implemented than before, this
holds in particular when there are several threads. The repair of Dets
tables has been rewritten, and is significantly faster than before. New
functions are: <code>to_ets/2</code> (adds Dets objects to an Ets
table); <code>foldl/3</code> and <code>foldr/3</code> (iterate over the
objects of a Dets table); <code>from_ets/2</code> (replaces Dets
objects by Ets objects); <code>select/1,2,3</code> (select Dets objects
using match specifications (see the ERTS User´s Guide for a
description of match specifications)); <code>match/1,3</code> (match
Dets objects in chunks); <code>select_delete/2</code> (deletes Dets
objects using match specifications); <code>delete_all_objects/1</code>
(deletes all objects of a Dets table efficiently);
<code>init_table/2</code> (initiates a Dets table using a function to
gather objects); <code>pid2name/1</code> (returns the name of the Dets
table handled by a pid).<br>
(*** POTENTIAL INCOMPATIBILITY ***)<br>
(Own Id: OTP-3786)<br>
(Aux Id: OTP-3746, OTP-3782, OTP-1831)<p>
</li>
<li>
A new API, member/2 has been added to ets and dets. This function makes
it possible to check for key prescence in a table without reading out
the actual data associated with the key.<br>
(Own Id: OTP-3804)<br>
(Aux Id: Seq 5029)<p>
</li>
<li>
<CODE>lists:merge3/3</CODE> is a new function that merges three sorted
lists. <CODE>lists:merge/1</CODE> is a new function that merges a list
of sorted lists.<br>
(Own Id: OTP-3880)<p>
</li>
<li>
Hidden nodes and hidden global groups have been introduced. This makes
it possible to establish hidden connections between Erlang nodes. See
global_group(3), and erl(1).<br>
(Own Id: OTP-3916)<br>
(Aux Id: OTP-3963)<p>
</li>
<li>
The new module <code>file_sorter</code> sorts terms on files.<br>
(Own Id: OTP-3926)<p>
</li>
<li>
The number of commands that are saved in the shell can now be changed
from the default number 20. The number of command results can be
changed independently. See the documentation for the <code>shell</code>
module.<br>
(Own Id: OTP-4035)<br>
(Aux Id: Seq 7035)<p>
</li>
<li>
The new module <code>sofs</code> manipulates sets of sets.<br>
(Own Id: OTP-4039)<p>
</li>
<li>
<CODE>usort/1</CODE>, <CODE>umerge/{1,2}</CODE>,
<CODE>umerge3/3</CODE>, <CODE>ukeysort/2</CODE>,
<CODE>ukeymerge/3</CODE>, <CODE>usort/2</CODE>, and
<CODE>umerge/3</CODE> are new functions in the <CODE>lists</CODE>
module. They work as <CODE>sort/1</CODE>, <CODE>merge/1</CODE> and so
on, but remove duplicates.<br>
(Own Id: OTP-4041)<p>
</li>
<li>
<code>dets:is_dets_file/1</code> is a new function that recognizes Dets
tables.<br>
(Own Id: OTP-4083)<br>
(Aux Id: Seq7090)<p>
</li>
<li>
A modified format of Dets tables has been introduced in order to
enhance performance, in particular when there are threads and for
tables of type <code>bag</code> or <code>duplicate_bag</code>. The
modified format preserves the time order of object insertions. The new
<code>open_file/2</code> option <code>version</code> sets the version
of new tables. Default is the version of the modified format. Opening a
table of the hitherto default format does not convert the table unless
the option <code>{repair,force}</code> is given.<br>
(Own Id: OTP-4108)<p>
</li>
<li>
It is now possible to have the compiler check user-defined behaviours
and not only the pre-defined OTP behaviours (gen_server etc.). <br>
This is done by adding a function <CODE>behaviour_info/1</CODE> to the
behaviour module. <CODE>behaviour_info(callbacks)</CODE> should return
a list of <CODE>{FunctionName,Arity}</CODE> which defines the callback
functions the behaviour uses. <br> When a callback module with the
attribute <CODE>-behaviour(Behaviour)</CODE> is compiled, its exported
functions will be compared with the list returned by
<CODE>Behaviour:behaviour_info(callbacks)</CODE> and a warning will be
issued if any callback function is missing. <br> Note that the user
must ensure that the module <CODE>Behaviour</CODE> is present at
compile-time and can be found in the current code path.<br>
(Own Id: OTP-4125)<p>
</li>
<li>
Process termination when the process owns ETS tables is made
considerably faster.<br>
(Own Id: OTP-4154)<br>
(Aux Id: OTP-3547)<p>
</li>
<li>
Due to the handling of the ETS name-to-table translations, a ets call
when the named table did not exist could take considerable time before
throwing "badarg". This is no longer the case.<br>
(Own Id: OTP-4155)<br>
(Aux Id: OTP-3547)<p>
</li>
<li>
The following new functions are added to the ets modules: ets:select/2
ets:select/3 ets:select/1 ets:match/3 ets:match/1 ets:match_object/3
ets:match_object/1 ets:member/2 ets:delete_all_objects/1
ets:delete_object/2 ets:from_dets/2 ets:to_dets/2 ets:test_ms/2 - See
the ETS manual page for details. Furthermore the ets:insert/2 function
now also accepts a list of objects to be inserted.<br>
(Own Id: OTP-4156)<br>
(Aux Id: OTP-3547)<p>
</li>
<li>
Ets:safe_fixtable/2 is made more efficient. Fixation is done without
message passing and structures are held internally by the emulator.<br>
(Own Id: OTP-4157)<br>
(Aux Id: OTP-3547)<p>
</li>
</ul>
There are also release notes for
<a href="notes_history.html">older versions</a>.
</body>
</html>
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