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| 1 | <html> |
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| 2 | <head> |
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| 3 | <title>BOOST_PP_CAT</title> |
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| 4 | <link rel="stylesheet" type="text/css" href="../styles.css"> |
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| 5 | </head> |
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| 6 | <body> |
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| 7 | <div style="margin-left: 0px;"> |
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| 8 | The <b>BOOST_PP_CAT</b> macro concatenates its arguments after they have been expanded. |
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| 9 | </div> |
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| 10 | <h4>Usage</h4> |
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| 11 | <div class="code"> |
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| 12 | <b>BOOST_PP_CAT</b>(<i>a</i>, <i>b</i>) |
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| 13 | </div> |
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| 14 | <h4>Arguments</h4> |
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| 15 | <dl> |
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| 16 | <dt>a</dt> |
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| 17 | <dd> |
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| 18 | The left operand of the concatenation. |
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| 19 | </dd> |
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| 20 | <dt>b</dt> |
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| 21 | <dd> |
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| 22 | The right operand of the concatenation. |
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| 23 | </dd> |
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| 24 | </dl> |
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| 25 | <h4>Remarks</h4> |
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| 26 | <div> |
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| 27 | The preprocessor token-pasting operator (<b>##</b>) prevents arguments from expanding. |
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| 28 | This macro allows its arguments to expand before concatenation. |
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| 29 | </div> |
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| 30 | <div> |
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| 31 | Concatenation must not result in an invocation of a macro that uses <b>BOOST_PP_CAT</b>. |
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| 32 | If that happens, <b>BOOST_PP_CAT</b> will not expand the second time. |
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| 33 | </div> |
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| 34 | <!-- <h4>See Also</h4> --> |
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| 35 | <h4>Requirements</h4> |
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| 36 | <div> |
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| 37 | <b>Header:</b> <a href="../headers/cat.html"><boost/preprocessor/cat.hpp></a> |
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| 38 | </div> |
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| 39 | <h4>Sample Code</h4> |
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| 40 | <div><pre> |
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| 41 | #include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>> |
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| 42 | |
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| 43 | <a href="cat.html">BOOST_PP_CAT</a>(x, <a href="cat.html">BOOST_PP_CAT</a>(y, z)) // expands to xyz |
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| 44 | </pre></div> |
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| 45 | </body> |
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| 46 | </html> |
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