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- <title>BOOST_PP_LIST_FOR_EACH_PRODUCT</title>
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- The <b>BOOST_PP_LIST_FOR_EACH_PRODUCT</b> macro repeats a macro for each cartesian product of several <i>lists</i>.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_LIST_FOR_EACH_PRODUCT</b>(<i>macro</i>, <i>size</i>, <i>tuple</i>)
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- <h4>Arguments</h4>
- <dl>
- <dt>macro</dt>
- <dd>
- The binary macro of the form <i>macro</i>(<i>r</i>, <i>product</i>).
- This macro is expanded by <b>BOOST_PP_FOR_EACH_PRODUCT</b> with each cartesian product in <i>tuple</i>.
- It is expanded with the next available <b>BOOST_PP_FOR</b> repetition and a <i>tuple</i> containing a cartesian product.
- This <i>tuple</i> will have <i>size</i> elements.
- </dd>
- <dt>size</dt>
- <dd>
- The size of <i>tuple</i>.
- </dd>
- <dt>tuple</dt>
- <dd>
- A <i>tuple</i> of <i>lists</i> from which cartesian products are obtained.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- This macro is a repetition construct.
- If two <i>lists</i> are (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>))) and (<i>x</i>, (<i>y</i>, (<i>z</i>, <b>BOOST_PP_NIL</b>))),
- this macro will produce the following sequence:
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- <i>macro</i>(<i>r</i>, (<i>a</i>, <i>x</i>))
- <i>macro</i>(<i>r</i>, (<i>a</i>, <i>y</i>))
- <i>macro</i>(<i>r</i>, (<i>a</i>, <i>z</i>))<br>
- <i>macro</i>(<i>r</i>, (<i>b</i>, <i>x</i>))
- <i>macro</i>(<i>r</i>, (<i>b</i>, <i>y</i>))
- <i>macro</i>(<i>r</i>, (<i>b</i>, <i>z</i>))<br>
- <i>macro</i>(<i>r</i>, (<i>c</i>, <i>x</i>))
- <i>macro</i>(<i>r</i>, (<i>c</i>, <i>y</i>))
- <i>macro</i>(<i>r</i>, (<i>c</i>, <i>z</i>))
- </div>
- </div>
- <div>
- 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_PRODUCT_R</b> in such a situation.
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="list_for_each_product_r.html">BOOST_PP_LIST_FOR_EACH_PRODUCT_R</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/list/for_each_product.html"><boost/preprocessor/list/for_each_product.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/list/for_each_product.html">boost/preprocessor/list/for_each_product.hpp</a>>
- #define L1 (a, (b, (c, <a href="nil.html">BOOST_PP_NIL</a>)))
- #define L2 (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>)))
- #define MACRO(r, product) product
- <a href="list_for_each_product.html">BOOST_PP_LIST_FOR_EACH_PRODUCT</a>(MACRO, 2, (L1, L2))
- // expands to (a, x) (a, y) (a, z) (b, x) (b, y) (b, z) (c, x) (c, y) (c, z)
- </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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