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- <title>BOOST_PP_LIST_FOR_EACH_I</title>
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- The <b>BOOST_PP_LIST_FOR_EACH_I</b> macro repeats a macro for each element in a <i>list</i>.
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- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_LIST_FOR_EACH_I</b>(<i>macro</i>, <i>data</i>, <i>list</i>)
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- <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>).
- This macro is expanded by <b>BOOST_PP_LIST_FOR_EACH_I</b> with each element in <i>list</i>.
- 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>list</dt>
- <dd>
- The <i>list</i> for which <i>macro</i> will be invoked on each element.
- </dd>
- </dl>
- <h4>Remarks</h4>
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- This macro is a repetition construct.
- 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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- <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>)
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- Previously, this macro could not be used inside <b>BOOST_PP_FOR</b>.
- There is no longer any such restriction.
- It is more efficient, however, to use <b>BOOST_PP_LIST_FOR_EACH_I_R</b> in such a situation.
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- <h4>See Also</h4>
- <ul>
- <li><a href="list_for_each_i_r.html">BOOST_PP_LIST_FOR_EACH_I_R</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/list/for_each_i.html"><boost/preprocessor/list/for_each_i.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
- #include <<a href="../headers/list/for_each_i.html">boost/preprocessor/list/for_each_i.hpp</a>>
- #define LIST (w, (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>))))
- #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="list_for_each_i.html">BOOST_PP_LIST_FOR_EACH_I</a>(MACRO, _, LIST) // expands to w_0 x_1 y_2 z_3
- </pre></div>
- <hr size="1">
- <div style="margin-left: 0px;">
- <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
- </br><i>© Copyright Paul Mensonides 2002</i>
- </div>
- <div style="margin-left: 0px;">
- <p><small>Distributed under the Boost Software License, Version 1.0. (See
- accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
- copy at <a href=
- "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
- </div>
- </body>
- </html>
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