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- <head>
- <title>BOOST_PP_LIST_FOR_EACH_PRODUCT_R</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
- </head>
- <body>
- <div style="margin-left: 0px;">
- The <b>BOOST_PP_LIST_FOR_EACH_PRODUCT_R</b> macro repeats a macro for each cartesian product of several <i>lists</i>.
- It reenters <b>BOOST_PP_FOR</b> with maximum efficiency.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_LIST_FOR_EACH_PRODUCT_R</b>(<i>r</i>, <i>macro</i>, <i>size</i>, <i>tuple</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <dt>r</dt>
- <dd>
- The next available <b>BOOST_PP_FOR</b> repetition.
- </dd>
- <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:
- <div>
- <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>
- <h4>See Also</h4>
- <ul>
- <li><a href="list_for_each_product.html">BOOST_PP_LIST_FOR_EACH_PRODUCT</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/arithmetic/dec.html">boost/preprocessor/arithmetic/dec.hpp</a>>
- #include <<a href="../headers/list/for_each_product.html">boost/preprocessor/list/for_each_product.hpp</a>>
- #include <<a href="../headers/repetition/for.html">boost/preprocessor/repetition/for.hpp</a>>
- #include <<a href="../headers/tuple/elem.html">boost/preprocessor/tuple/elem.hpp</a>>
- #define L1 (a, (b, <a href="nil.html">BOOST_PP_NIL</a>))
- #define L2 (x, (y, <a href="nil.html">BOOST_PP_NIL</a>))
- #define PRED(r, state) <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 0, state)
- #define OP(r, state) \
- ( \
- <a href="dec.html">BOOST_PP_DEC</a>( \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 0, state) \
- ), \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 1, state) \
- ) \
- /**/
- #define MACRO(r, state) \
- MACRO_I( \
- r, \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 0, state), \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 1, state) \
- ) \
- /**/
- #define MACRO_I(r, c, t) \
- <a href="list_for_each_product_r.html">BOOST_PP_LIST_FOR_EACH_PRODUCT_R</a>( \
- r, MACRO_P, 2, \
- ( \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, <a href="dec.html">BOOST_PP_DEC</a>(c), t), \
- <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, <a href="dec.html">BOOST_PP_DEC</a>(c), t) \
- ) \
- ) \
- /**/
- #define MACRO_P(r, product) product
- <a href="for.html">BOOST_PP_FOR</a>((2, (L1, L2)), PRED, OP, MACRO)
- // expands to (x, x) (x, y) (y, x) (y, y) (a, a) (a, b) (b, a) (b, b)
- </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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