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<?xml version="1.0"?>
<concept name="Assignable" category="Utility"><!--
Based on concepts from the SGI Standard Template Library documentation:
Copyright (c) 1996-1999
Silicon Graphics Computer Systems, Inc.
Copyright (c) 1994
Hewlett-Packard Company
--><!--
Copyright 2000-2001 University of Notre Dame du Lac.
Copyright 2001-2002 Indiana University.
Some concepts based on versions from the MTL draft manual and Boost Graph
and Property Map documentation:
Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
-->
<param name="X" role="assignable-type"/>
<models-sentence>The type <arg num="1"/> must be a model of <self/>.</models-sentence>
<description>
<para>Assignable types must have copy constructors,
<code>operator=</code> for assignment, and the <code>swap()</code>
function defined.</para>
</description>
<notation variables="x y">
<sample-value>
<type name="X"/>
</sample-value>
</notation>
<refines const="no" concept="CopyConstructible"/>
<valid-expression name="Assignment">
<assign>
<sample-value><reference-to><type name="X"/></reference-to></sample-value>
<sample-value><const><reference-to><type name="X"/></reference-to></const></sample-value>
</assign>
<return-type>
<require-same-type testable="yes">
<reference-to><type name="X"/></reference-to>
</require-same-type>
</return-type>
<semantics>Require <code>operator=</code></semantics>
</valid-expression>
<valid-expression name="Swap">
<apply-function name="swap">
<sample-value><reference-to><type name="X"/></reference-to></sample-value>
<sample-value><reference-to><type name="X"/></reference-to></sample-value>
</apply-function>
<return-type><require-same-type><type name="void"/></require-same-type></return-type>
<semantics>Require <code>swap()</code> function</semantics>
</valid-expression>
<example-model>
<type name="int"/>
</example-model>
</concept>
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