<html> <head> <title>BOOST_PP_LIST_FOR_EACH_I_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_I_R</b> macro repeats a macro for each element in a <i>list</i>. It reenters <b>BOOST_PP_FOR</b> with maximum efficiency. </div> <h4>Usage</h4> <div class="code"> <b>BOOST_PP_LIST_FOR_EACH_I_R</b>(<i>r</i>, <i>macro</i>, <i>data</i>, <i>list</i>) </div> <h4>Arguments</h4> <dl> <dt>r</dt> <dd> The next available <b>BOOST_PP_FOR</b> repetition. </dd> <dt>macro</dt> <dd> A macro of the for <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> <div> 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: <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> <h4>See Also</h4> <ul> <li><a href="list_for_each_i.html">BOOST_PP_LIST_FOR_EACH_I</a></li> </ul> <h4>Requirements</h4> <div> <b>Header:</b> <a href="../headers/list/for_each_i.hpp.html"><boost/preprocessor/list/for_each_i.hpp></a> </div> <h4>Sample Code</h4> <div><pre> #include <<a href="../headers/cat.hpp.html">boost/preprocessor/cat.hpp</a>> #include <<a href="../headers/list/adt.hpp.html">boost/preprocessor/list/adt.hpp</a>> #include <<a href="../headers/list/for_each_i.hpp.html">boost/preprocessor/list/for_each_i.hpp</a>> #include <<a href="../headers/repetition/for.hpp.html">boost/preprocessor/repetition/for.hpp</a>> #define LIST (x, (y, (z, <a href="nil.html">BOOST_PP_NIL</a>))) #define MACRO_2(r, data, i, elem) <a href="cat.html">BOOST_PP_CAT</a>(elem, i) #define PRED(r, state) <a href="list_is_cons.html">BOOST_PP_LIST_IS_CONS</a>(state) #define OP(r, state) <a href="list_rest.html">BOOST_PP_LIST_REST</a>(state) #define MACRO(r, state) [ <a href="list_for_each_i_r.html">BOOST_PP_LIST_FOR_EACH_I_R</a>(r, MACRO_2, _, state) ] <a href="for.html">BOOST_PP_FOR</a>(LIST, PRED, OP, MACRO) // expands to [x0 y1 z2] [y0 z1] [z0] </pre></div> </body> </html>
