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- <title>BOOST_PP_IF</title>
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- The <b>BOOST_PP_IF</b> macro chooses between to values based on a logical condition.
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- <h4>Usage</h4>
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- <b>BOOST_PP_IF</b>(<i>cond</i>, <i>t</i>, <i>f</i>)
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- <h4>Arguments</h4>
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- <dt>cond</dt>
- <dd>
- The condition that determines if the result is <i>expr</i> or nothing.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
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- <dt>t</dt>
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- The result of the expansion if <i>cond</i> is non-zero.
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- <dt>f</dt>
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- The result of the expansion if <i>cond</i> is <i>0</i>.
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- </dl>
- <h4>Remarks</h4>
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- This macro performs a boolean conversion on its first argument.
- If that conversion is unnecessary, use <b>BOOST_PP_IIF</b> instead.
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- <h4>See Also</h4>
- <ul>
- <li><a href="iif.html">BOOST_PP_IIF</a></li>
- <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
- </ul>
- <h4>Requirements</h4>
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- <b>Header:</b> <a href="../headers/control/if.html"><boost/preprocessor/control/if.hpp></a>
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- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>>
- <a href="if.html">BOOST_PP_IF</a>(10, a, b) // expands to a
- <a href="if.html">BOOST_PP_IF</a>(0, a, b) // expands to b
- </pre></div>
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- <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
- </br><i>© Copyright Paul Mensonides 2002</i>
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- <div style="margin-left: 0px;">
- <p><small>Distributed under the Boost Software License, Version 1.0. (See
- accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
- copy at <a href=
- "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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