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2002-11-07 23:39:29 +00:00
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<head>
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<title>BOOST_PP_SEQ_TRANSFORM</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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</head>
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<body>
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_SEQ_TRANSFORM</b> macro transforms each element in a <i>seq</i>
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according to a supplied transformation.
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</div>
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<h4>
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Usage
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</h4>
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<div class="code">
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<b>BOOST_PP_SEQ_TRANSFORM</b>(<i>op</i>, <i>data</i>, <i>seq</i>)
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</div>
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<h4>
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Arguments
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</h4>
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2002-10-13 05:47:23 +00:00
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<dl>
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<dt>op</dt>
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<dd>
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A ternary predicate of the form <i>op</i>(<i>s</i>, <i>data</i>, <i>elem</i>).
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This transformation is expanded by <b>BOOST_PP_SEQ_TRANSFORM</b> for each
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element in <i>seq</i> with the next available <b>BOOST_PP_SEQ_FOLD_LEFT</b> fold
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step, the auxiliary <i>data</i>, and the current element in <i>seq</i>.
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</dd>
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<dt>data</dt>
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<dd>
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Auxiliary data passed to <i>pred</i>.
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</dd>
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<dt>seq</dt>
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<dd>
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The <i>seq</i> to be transformed.
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</dd>
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</dl>
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<h4>
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Remarks
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</h4>
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<div>
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This macro expands <i>op</i> for each element in <i>seq</i>. It builds a
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new <i>seq</i> out of the results of each call. If, for example, <i>seq</i>
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is (<i>a</i>)(<i>b</i>)(<i>c</i>), this macro expands to...
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<div>
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(<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>,
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<i>data</i>, <i>c</i>))
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</div>
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</div>
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<div>
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For maximum efficiency, use <b>BOOST_PP_SEQ_TRANSFORM_S</b>.
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</div>
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<h4>
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See Also
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</h4>
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<ul>
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<li>
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<a href="seq_transform_s.html">BOOST_PP_SEQ_TRANSFORM_S</a></li>
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</ul>
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<h4>
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Requirements
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</h4>
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<div>
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2004-10-11 06:58:45 +00:00
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<b>Header:</b> <a href="../headers/seq/transform.html"><boost/preprocessor/seq/transform.hpp></a>
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</div>
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<h4>
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Sample Code
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</h4>
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<div>
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<pre>
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2004-10-11 06:58:45 +00:00
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#include <<a href="../headers/arithmetic/dec.html">boost/preprocessor/arithmetic/dec.hpp</a>>
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#include <<a href="../headers/seq/transform.html">boost/preprocessor/seq/transform.hpp</a>>
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#define SEQ (1)(3)(2)(5)
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#define OP(s, data, elem) <a href="dec.html">BOOST_PP_DEC</a>(elem)
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<a href="seq_transform.html">BOOST_PP_SEQ_TRANSFORM</a>(OP, 3, SEQ)
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// expands to (0)(2)(1)(4)
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</pre>
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</div>
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</body>
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2002-10-13 05:47:23 +00:00
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</html>
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