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<head>
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<title>BOOST_PP_SEQ_FOR_EACH_I</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_FOR_EACH_I</b> macro repeats a macro for each element in a <i>seq</i>.
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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_FOR_EACH_I</b>(<i>macro</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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<dl>
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<dt>macro</dt>
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<dd>
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A macro of the form <i>macro</i>(<i>r</i>, <i>data</i>, <i>i</i>, <i>elem</i>).
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This macro is expanded by <b>BOOST_PP_SEQ_FOR_EACH_I</b> with each element in <i>seq</i>.
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It is expanded with the next available <b>BOOST_PP_FOR</b> repetition, the
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auxiliary <i>data</i>, the index of the current element, and the current
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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>seq</dt>
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<dd>
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The <i>seq</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>
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Remarks
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</h4>
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<div>
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This macro is a repetition construct. If <i>seq</i> is (<i>a</i>)(<i>b</i>)(<i>c</i>),
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it expands to the sequence:
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<div>
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<i>macro</i>(<i>r</i>, <i>data</i>, <i>0</i>, <i>a</i>) <i>macro</i>(<i>r</i>, <i>data</i>,
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<i>1</i>, <i>b</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>2</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_FOR_EACH_I_R</a></li>
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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_for_each_i_r.html">BOOST_PP_SEQ_FOR_EACH_I_R</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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<b>Header:</b> <a href="../headers/seq/for_each_i.hpp.html"><boost/preprocessor/seq/for_each_i.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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#include <<a href="../headers/cat.hpp.html">boost/preprocessor/cat.hpp</a>>
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#include <<a href="../headers/seq/for_each_i.hpp.html">boost/preprocessor/seq/for_each_i.hpp</a>>
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#define SEQ (a)(b)(c)(d)
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#define MACRO(r, data, i, elem) <a href="cat.html">BOOST_PP_CAT</a>(elem, <a href="cat.html">BOOST_PP_CAT</a>(data, i))
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2002-11-07 23:39:29 +00:00
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<a href="seq_for_each_i.html">BOOST_PP_SEQ_FOR_EACH_I</a>(MACRO, _, SEQ) // expands to a_0 b_1 c_2 d_3
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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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