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.. Copyright (C) 2004-2008 The Trustees of Indiana University.
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
================================
|Logo| Concept Global Descriptor
================================
.. contents::
Description
-----------
A global descriptor is an object that represents an entity that is
owned by some process and may reside in an address space not
accessible to the currently-executing process. The global descriptor
consists of two parts: the *owner* of the entity, which is the
identifier of that process in which the entity resides, and a *local
descriptor*, that uniquely identifies the entity with the address
space of the owner.
Refinement of
-------------
- `Default Constructible`_
- Assignable_
Notation
--------
X
A type that models the Global Descriptor concept.
x
Object of type X
Associated types
----------------
+----------------+--------------------+---------------------------------+
|Process ID type |``process_id_type`` |Determined by the process group |
| | |associated with type X. |
+----------------+--------------------+---------------------------------+
|Local descriptor|``local_type`` |Determined by the data structure |
|type | |the descriptor accesses. |
| | |Must model `Equality Comparable`_|
| | |and `Copy Constructible`_. |
+----------------+--------------------+---------------------------------+
Valid Expressions
-----------------
+----------------+---------------------+---------------------+-------------------------------------+
|Name |Expression |Type |Semantics |
+================+=====================+=====================+=====================================+
|Owner |``owner(x)`` |``process_id_type`` |Returns the owner of ``x``. |
+----------------+---------------------+---------------------+-------------------------------------+
|Local descriptor|``local(x)`` |``local_type`` |Returns the local descriptor |
| | | |uniquely identifying ``x``. |
+----------------+---------------------+---------------------+-------------------------------------+
-----------------------------------------------------------------------------
Copyright (C) 2005 The Trustees of Indiana University.
Authors: Douglas Gregor and Andrew Lumsdaine
.. |Logo| image:: pbgl-logo.png
:align: middle
:alt: Parallel BGL
:target: http://www.osl.iu.edu/research/pbgl
.. _Assignable: http://www.sgi.com/tech/stl/Assignable.html
.. _Copy constructible: http://www.sgi.com/tech/stl/CopyConstructible.html
.. _Default constructible: http://www.sgi.com/tech/stl/DefaultConstructible.html
.. _Equality comparable: http://www.sgi.com/tech/stl/EqualityComparable.html
|
