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<title>BOOST_PP_CAT</title>
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The <b>BOOST_PP_CAT</b> macro concatenates its arguments after they have been expanded.
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<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_CAT</b>(<i>a</i>, <i>b</i>)
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<h4>Arguments</h4>
<dl>
<dt>a</dt>
<dd>
The left operand of the concatenation.
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<dt>b</dt>
<dd>
The right operand of the concatenation.
</dd>
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<h4>Remarks</h4>
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The preprocessor token-pasting operator (<b>##</b>) prevents arguments from expanding.
This macro allows its arguments to expand before concatenation.
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<div>
Concatenation must not result in an invocation of a macro that uses <b>BOOST_PP_CAT</b>.
If that happens, <b>BOOST_PP_CAT</b> will not expand the second time.
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<!-- <h4>See Also</h4> -->
<h4>Requirements</h4>
<div>
<b>Header:</b> <a href="../headers/cat.html"><boost/preprocessor/cat.hpp></a>
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<h4>Sample Code</h4>
<div><pre>
#include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
<a href="cat.html">BOOST_PP_CAT</a>(x, <a href="cat.html">BOOST_PP_CAT</a>(y, z)) // expands to xyz
</pre></div>
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