forked from boostorg/preprocessor
48 lines
1.4 KiB
HTML
48 lines
1.4 KiB
HTML
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<html>
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<head>
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<title>BOOST_PP_CAT</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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<script language="javascript" type="text/javascript" src="../scripts.js"></script>
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</head>
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<body onload="init('sample');">
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_CAT</b> macro concatenates its arguments after they have been expanded.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_CAT</b>(<i>a</i>, <i>b</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>a</dt>
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<dd>
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The left operand of the concatenation.
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</dd>
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<dt>b</dt>
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<dd>
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The right operand of the concatenation.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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The preprocessor token-pasting operator (<b>##</b>) prevents arguments from expanding.
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This macro allows its arguments to expand before concatenation.
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</div>
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<div>
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Concatenation must not result in an invocation of a macro that uses <b>BOOST_PP_CAT</b>.
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If that happens, <b>BOOST_PP_CAT</b> will not expand the second time.
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</div>
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<!-- <h4>See Also</h4> -->
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/cat.hpp.html"><boost/preprocessor/cat.hpp></a>
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</div>
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<h4><a class="local" onclick="toggle('sample');" onmouseover="change(this);" onmouseout="revert(this);">Sample Code</a></h4>
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<div id="sample"><pre>
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#include <boost/preprocessor/cat.hpp>
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BOOST_PP_CAT(x, BOOST_PP_CAT(y, z)) // expands to xyz
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<pre></div>
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</body>
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</html>
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