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76 lines
2.7 KiB
HTML
76 lines
2.7 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_LIST_FOR_EACH</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_LIST_FOR_EACH</b> macro repeats a macro for each element in a <i>list</i>.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_LIST_FOR_EACH</b>(<i>macro</i>, <i>data</i>, <i>list</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>macro</dt>
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<dd>
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A ternary macro of the form <i>macro</i>(<i>r</i>, <i>data</i>, <i>elem</i>).
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This macro is expanded by <b>BOOST_PP_LIST_FOR_EACH</b> with each element in <i>list</i>.
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It is expanded with the next available <b>BOOST_PP_FOR</b> repetition, the auxiliary <i>data</i>, and the current element.
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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>macro</i>.
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</dd>
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<dt>list</dt>
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<dd>
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The <i>list</i> for which <i>macro</i> will be invoked on each element.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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This macro is a repetition construct.
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If <i>list</i> is (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))), it expands to the sequence:
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<div>
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<i>macro</i>(<i>r</i>, <i>data</i>, <i>a</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>b</i>) <i>macro</i>(<i>r</i>, <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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Previously, this macro could not be used inside <b>BOOST_PP_FOR</b>.
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There is no longer any such restriction.
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It is more efficient, however, to use <b>BOOST_PP_LIST_FOR_EACH_R</b> in such a situation.
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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="list_for_each_r.html">BOOST_PP_LIST_FOR_EACH_R</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/list/for_each.html"><boost/preprocessor/list/for_each.hpp></a>
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</div>
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<h4>Sample Code</h4>
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<div><pre>
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#include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
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#include <<a href="../headers/list/for_each.html">boost/preprocessor/list/for_each.hpp</a>>
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#define LIST (w, (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>))))
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#define MACRO(r, data, elem) <a href="cat.html">BOOST_PP_CAT</a>(elem, data)
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<a href="list_for_each.html">BOOST_PP_LIST_FOR_EACH</a>(MACRO, _, LIST) // expands to w_ x_ y_ z_
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</pre></div>
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<hr size="1">
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<div style="margin-left: 0px;">
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<i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
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</br><i>© Copyright Paul Mensonides 2002</i>
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</div>
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<div style="margin-left: 0px;">
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<p><small>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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</div>
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</body>
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</html>
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