67 lines
2.1 KiB
HTML
67 lines
2.1 KiB
HTML
<html>
|
|
<head>
|
|
<title>BOOST_PP_IIF</title>
|
|
<link rel="stylesheet" type="text/css" href="../styles.css">
|
|
</head>
|
|
<body>
|
|
<div style="margin-left: 0px;">
|
|
The <b>BOOST_PP_IIF</b> macro chooses between to values based on a bitwise condition.
|
|
</div>
|
|
<h4>Usage</h4>
|
|
<div class="code">
|
|
<b>BOOST_PP_IIF</b>(<i>bit</i>, <i>t</i>, <i>f</i>)
|
|
</div>
|
|
<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>.
|
|
</dd>
|
|
<dt>t</dt>
|
|
<dd>
|
|
The result of the expansion if <i>bit</i> is <i>1</i>.
|
|
</dd>
|
|
<dt>f</dt>
|
|
<dd>
|
|
The result of the expansion if <i>bit</i> is <i>0</i>.
|
|
</dd>
|
|
</dl>
|
|
<h4>Remarks</h4>
|
|
<div>
|
|
This macro <i>does not</i> perform a boolean conversion on its first argument.
|
|
If that conversion is necessary, use <b>BOOST_PP_IF</b> instead.
|
|
</div>
|
|
<h4>See Also</h4>
|
|
<ul>
|
|
<li><a href="if.html">BOOST_PP_IF</a></li>
|
|
<li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
|
|
</ul>
|
|
<h4>Requirements</h4>
|
|
<div>
|
|
<b>Header:</b> <a href="../headers/control/iif.html"><boost/preprocessor/control/iif.hpp></a>
|
|
</div>
|
|
<h4>Sample Code</h4>
|
|
<div><pre>
|
|
#include <<a href="../headers/control/iif.html">boost/preprocessor/control/iif.hpp</a>>
|
|
#include <<a href="../headers/logical/or.html">boost/preprocessor/logical/or.hpp</a>>
|
|
|
|
#define OR_IF(p, q, t, f) <a href="iif.html">BOOST_PP_IIF</a>(<a href="or.html">BOOST_PP_OR</a>(p, q), t, f)
|
|
|
|
OR_IF(1, 0, abc, xyz) // expands to abc
|
|
OR_IF(0, 0, abc, xyz) // expands to xyz
|
|
</pre></div>
|
|
<hr size="1">
|
|
<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>
|
|
</html>
|