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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_FOR_EACH_I</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_SEQ_FOR_EACH_I</b> macro repeats a macro for each element in a <i>seq</i>.
</div>
<h4>
Usage
</h4>
<div class="code">
<b>BOOST_PP_SEQ_FOR_EACH_I</b>(<i>macro</i>, <i>data</i>, <i>seq</i>)
</div>
<h4>
Arguments
</h4>
<dl>
<dt>macro</dt>
<dd>
A macro of the form <i>macro</i>(<i>r</i>, <i>data</i>, <i>i</i>, <i>elem</i>).&nbsp;
This macro is expanded by <b>BOOST_PP_SEQ_FOR_EACH_I</b> with each element in <i>seq</i>.&nbsp;
It is expanded with the next available <b>BOOST_PP_FOR</b> repetition, the
auxiliary <i>data</i>, the index of the current element, and the current
element.
</dd>
<dt>data</dt>
<dd>
Auxiliary data passed to <i>macro</i>.
</dd>
<dt>seq</dt>
<dd>
The <i>seq</i> for which <i>macro</i> will be invoked on each element.
</dd>
</dl>
<h4>
Remarks
</h4>
<div>
This macro is a repetition construct.&nbsp; If <i>seq</i> is (<i>a</i>)(<i>b</i>)(<i>c</i>),
it expands to the sequence:
<div>
<i>macro</i>(<i>r</i>, <i>data</i>, <i>0</i>, <i>a</i>) <i>macro</i>(<i>r</i>, <i>data</i>,
<i>1</i>, <i>b</i>) <i>macro</i>(<i>r</i>, <i>data</i>, <i>2</i>, <i>c</i>)
</div>
</div>
<div>
For maximum efficiency, use <b>BOOST_PP_SEQ_FOR_EACH_I_R</a></li>
</div>
<h4>
See Also
</h4>
<ul>
<li>
<a href="seq_for_each_i_r.html">BOOST_PP_SEQ_FOR_EACH_I_R</a></li>
</ul>
<h4>
Requirements
</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/seq/for_each_i.hpp.html">&lt;boost/preprocessor/seq/for_each_i.hpp&gt;</a>
</div>
<h4>
Sample Code
</h4>
<div>
<pre>
#include &lt;<a href="../headers/cat.hpp.html">boost/preprocessor/cat.hpp</a>&gt;
#include &lt;<a href="../headers/seq/for_each_i.hpp.html">boost/preprocessor/seq/for_each_i.hpp</a>&gt;
#define SEQ (a)(b)(c)(d)
#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))
<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
</pre>
</div>
</body>
</html>