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<Head>
<Title>Identity Property Map</Title>
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<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>

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