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