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[SVN r16152]
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Paul Mensonides
2002-11-08 02:12:35 +00:00
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<html>
<head>
<title>BOOST_PP_SEQ_TRANSFORM</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_SEQ_TRANSFORM</b> macro transforms each element in a <i>seq</i>
according to a supplied transformation.
</div>
<h4>
Usage
</h4>
<div class="code">
<b>BOOST_PP_SEQ_TRANSFORM</b>(<i>op</i>, <i>data</i>, <i>seq</i>)
</div>
<h4>
Arguments
</h4>
<dl>
<dt>op</dt>
<dd>
A ternary predicate of the form <i>op</i>(<i>s</i>, <i>data</i>, <i>elem</i>).&nbsp;
This transformation is expanded by <b>BOOST_PP_SEQ_TRANSFORM</b> for each
element in <i>seq</i> with the next available <b>BOOST_PP_SEQ_FOLD_LEFT</b> fold
step, the auxiliary <i>data</i>, and the current element in <i>seq</i>.&nbsp;
</dd>
<dt>data</dt>
<dd>
Auxiliary data passed to <i>pred</i>.
</dd>
<dt>seq</dt>
<dd>
The <i>seq</i> to be transformed.
</dd>
</dl>
<h4>
Remarks
</h4>
<div>
This macro expands <i>op</i> for each element in <i>seq</i>.&nbsp; It builds a
new <i>seq</i> out of the results of each call.&nbsp; If, for example, <i>seq</i>
is (<i>a</i>)(<i>b</i>)(<i>c</i>), this macro expands to...
<div>
(<i>op</i>(<i>d</i>, <i>data</i>, <i>a</i>))(<i>op</i>(<i>d</i>, <i>data</i>, <i>b</i>))(<i>op</i>(<i>d</i>,
<i>data</i>, <i>c</i>))
</div>
</div>
<div>
For maximum efficiency, use <b>BOOST_PP_SEQ_TRANSFORM_S</b>.
</div>
<h4>
See Also
</h4>
<ul>
<li>
<a href="seq_transform_s.html">BOOST_PP_SEQ_TRANSFORM_S</a></li>
</ul>
<h4>
Requirements
</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/seq/transform.hpp.html">&lt;boost/preprocessor/seq/transform.hpp&gt;</a>
</div>
<h4>
Sample Code
</h4>
<div>
<pre>
#include &lt;<a href="../headers/arithmetic/dec.hpp.html">boost/preprocessor/arithmetic/dec.hpp</a>&gt;
#include &lt;<a href="../headers/seq/transform.hpp.html">boost/preprocessor/seq/transform.hpp</a>&gt;
#define SEQ (1)(3)(2)(5)
#define OP(s, data, elem) <a href="dec.html">BOOST_PP_DEC</a>(elem)
<a href="seq_transform.html">BOOST_PP_SEQ_TRANSFORM</a>(OP, 3, SEQ)
// expands to (0)(2)(1)(4)
</pre>
</div>
</body>
</html>