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- <title>BOOST_PP_EXPR_IIF</title>
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- The <b>BOOST_PP_EXPR_IIF</b> macro expands to its second argument if its first argument is <i>1</i> and expands to nothing if its first argument is <i>0</i>.
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- <h4>Usage</h4>
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- <b>BOOST_PP_EXPR_IIF</b>(<i>bit</i>, <i>expr</i>)
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- <h4>Arguments</h4>
- <dl>
- <dt>bit</dt>
- <dd>
- The condition that determines if the result is <i>expr</i> or nothing.
- This value must expand to <i>0</i> or </i>1</i>.
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- <dt>expr</dt>
- <dd>
- The result of the expansion if <i>bit</i> is <i>1</i>.
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- </dl>
- <h4>Remarks</h4>
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- This macro <i>does not</i> perform a boolean conversion on its first argument.
- If that conversion is necessary, use <b>BOOST_PP_EXPR_IF</b> instead.
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- <h4>See Also</h4>
- <ul>
- <li><a href="expr_if.html">BOOST_PP_EXPR_IF</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/expr_iif.html"><boost/preprocessor/control/expr_iif.hpp></a>
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- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/logical/and.html">boost/preprocessor/logical/and.hpp</a>>
- #include <<a href="../headers/control/expr_iif.html">boost/preprocessor/control/expr_iif.hpp</a>>
- #define INSERT_AND(p, q, text) \
- <a href="expr_iif.html">BOOST_PP_EXPR_IIF</a>( \
- <a href="and.html">BOOST_PP_AND</a>(p, q), \
- text \
- ) \
- /**/
- INSERT_AND(2, 3, abc) // expands to abc
- INSERT_AND(0, 7, xyz) // expands to nothing
- </pre></div>
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- <div style="margin-left: 0px;">
- <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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