.. 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