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Library/boost/libs/preprocessor/doc/ref/if.html

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19 дек 2024, 19:11

19 дек 2024, 19:1105db15d

<html>
<head>
	<title>BOOST_PP_IF</title>
	<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
	<div style="margin-left:  0px;">
		The <b>BOOST_PP_IF</b> macro chooses between to values based on a logical condition.
	</div>
	<h4>Usage</h4>
		<div class="code">
			<b>BOOST_PP_IF</b>(<i>cond</i>, <i>t</i>, <i>f</i>)
		</div>
	<h4>Arguments</h4>
		<dl>
			<dt>cond</dt>
			<dd>
				The condition that determines if the result is <i>expr</i> or nothing.&nbsp;
				Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
			</dd>
			<dt>t</dt>
			<dd>
				The result of the expansion if <i>cond</i> is non-zero.
			</dd>
			<dt>f</dt>
			<dd>
				The result of the expansion if <i>cond</i> is <i>0</i>.
			</dd>
		</dl>
	<h4>Remarks</h4>
		<div>
			This macro performs a boolean conversion on its first argument.&nbsp;
			If that conversion is unnecessary, use <b>BOOST_PP_IIF</b> instead.
		</div>
	<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>
		<div>
			<b>Header:</b> &nbsp;<a href="../headers/control/if.html">&lt;boost/preprocessor/control/if.hpp&gt;</a>
		</div>
	<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>&gt;

<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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	<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>
	</div>
	<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>
	</div>
</body>
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