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<title>Macro BOOST_VMD_IDENTITY</title>
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<h2><span class="refentrytitle">Macro BOOST_VMD_IDENTITY</span></h2>
<p>BOOST_VMD_IDENTITY &#8212; Macro which expands to its argument when invoked with any number of parameters. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="header/boost/vmd/identity_hpp.html" title="Header &lt;boost/vmd/identity.hpp&gt;">boost/vmd/identity.hpp</a>&gt;

</span>BOOST_VMD_IDENTITY(item)</pre></div>
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<a name="idm45529680829952"></a><h2>Description</h2>
<p>item = any single argument</p>
<p>When BOOST_VMD_IDENTITY(item) is subsequently invoked with any number of parameters it expands to 'item'. Subsequently invoking the macro is done as 'BOOST_VMD_IDENTITY(item)(zero_or_more_arguments)'.</p>
<p>The macro is equivalent to the Boost PP macro BOOST_PP_IDENTITY(item) with the difference being that BOOST_PP_IDENTITY(item) is always invoked with no arguments, as in 'BOOST_VMD_IDENTITY(item)()' whereas BOOST_VMD_IDENTITY can be invoked with any number of arguments.</p>
<p>The macro is meant to be used in BOOST_PP_IF and BOOST_PP_IIF statements when only one of the clauses needs to be invoked with calling another macro and the other is meant to return an 'item'.</p>
<p>returns = the macro as 'BOOST_VMD_IDENTITY(item)', when invoked with any number of parameters as in '(zero_or_more_arguments)', returns 'item'. The macro itself returns 'item BOOST_VMD_EMPTY'. </p>
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