| <html> |
| <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> |
