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Boost library as in https://sourceforge.net/projects/boost/files/boost/1.57.0/

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<HTML> <!-- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000, Alex Hagen-Zanker (2012) Distributed under 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) --> <Head> <Title>Identity Property Map</Title> <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="../../../boost.png" ALT="C++ Boost" width="277" height="86"> <BR Clear> <H2><A NAME="sec:identity-property-map"></A> </h2> <PRE> boost::typed_identity_property_map&lt;T&gt; typedef boost::typed_identity_propoperty_map&lt;std::size_t&gt; boost::identity_property_map </PRE> <p>The <code>typed_identity_property_map</code> property map applies the identity function, that is, it just returns a copy of the key object that was input. The key and value types are both the same as the template parameter <code>T</code>. The <code>identity_property_map</code> name is for the common case where the key and value type are <code>std::size_t</code> (this name is deprecated for use within Boost.Graph). </p> <p><em>Note:</em> Previously the function <code>get()</code> and <code>operator[]</code> for <code>identity_property_map</code> were overloaded to return a copy of keys of any type, i.e., not just <code>size_t</code>. These overloads are now deprecated, because they did not adhere to the property map concepts.</p> <H3>Where Defined</H3> <P> <a href="../../../boost/property_map/property_map.hpp"><TT>boost/property_map/property_map.hpp</TT></a> </P> <h3>Model of</h3> <a href="./ReadablePropertyMap.html">Readable Property Map</a> <h3>Template Parameters</h3> <TABLE border> <TR> <th>Parameter</th> <th>Description</th> <th>Default</th> </tr> <TR> <TD><TT>T</TT></TD> <TD>Must be Copy Contructible</TD> <TD>&nbsp;</td> </tr> </TABLE> <h3>Associated Types</h3> <table border> <tr> <th>Type</th><th>Description</th> </tr> <tr> <td><tt> boost::property_traits&lt;typed_identity_property_map&lt;T&gt; &gt;::value_type </tt></td> <td> This type is <tt>T</tt>. </td> </tr> <tr> <td><tt> boost::property_traits&lt;typed_identity_property_map&lt;T&gt; &gt;::key_type </tt></td> <td> This type is <tt>T</tt>.</td> </tr> <tr> <td><tt> boost::property_traits&lt;typed_identity_property_map&lt;T&gt; &gt;::reference </tt></td> <td> This type is <tt>T</tt>..</td> </tr> <tr> <td><tt> boost::property_traits&lt;typed_identity_property_map&lt;T&gt; &gt;::category </tt></td> <td> This type is <tt>boost::readable_property_map_tag</tt>. </td> </tr> </table> <h3>Member Functions</h3> <table border> <tr> <th>Member</th><th>Description</th> </tr> <tr> <td><tt> typed_identity_property_map() </tt></td> <td> Default constructor. </td> </tr> <tr> <td><tt> typed_identity_property_map(const typed_identity_property_map&lt;T&gt;&amp; x) </tt></td> <td> Copy constructor. </td> </tr> <tr> <td><tt> T operator[](const T&amp; x) const </tt></td> <td> Returns a copy of object <tt>x</tt>. </td> </tr> </table> <h3>Non-Member Functions</h3> <table border> <tr> <th>Member</th><th>Description</th> </tr> <tr> <td><tt> T get(const typed_identity_property_map&lt;T&gt;&amp; pmap, const T&amp; x) </tt></td> <td> Returns a copy of object <tt>x</tt>. </td> </tr> </table> <br> <HR> <TABLE> <TR valign=top> <TD nowrap>Copyright &copy; 2000-2012</TD><TD> <a HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</a>, Univ.of Notre Dame (<A HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>)<br> <A HREF="http://www.boost.org/people/liequan_lee.htm">Lie-Quan Lee</A>, Univ. of Notre Dame (<A HREF="mailto:llee1@lsc.nd.edu">llee1@lsc.nd.edu</A>)<br> <A HREF="http://www.lsc.nd.edu/~lums">Andrew Lumsdaine</A>, Univ.of Notre Dame (<A HREF="mailto:lums@lsc.nd.edu">lums@lsc.nd.edu</A>)<br> Alex Hagen-Zanker</TD></TR></TABLE> </BODY> </HTML>