93 lines
2.8 KiB
HTML
93 lines
2.8 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_SEQ_FOLD_RIGHT</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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</head>
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<body>
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_SEQ_FOLD_RIGHT</b> macro folds (or accumulates) the elements of
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a <i>seq</i> right-to-left.
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</div>
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<h4>
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Usage
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</h4>
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<div class="code">
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<b>BOOST_PP_SEQ_FOLD_RIGHT</b>(<i>op</i>, <i>state</i>, <i>seq</i>)
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</div>
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<h4>
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Arguments
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</h4>
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<dl>
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<dt>op</dt>
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<dd>
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A ternary operation of the form <i>op</i>(<i>s</i>, <i>state</i>, <i>elem</i>).
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This macro is called for each element in <i>seq</i>--each time returning a new <i>state</i>.
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This operation is expanded by <b>BOOST_PP_SEQ_FOLD_RIGHT</b> with the next
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available fold step, the current <i>state</i>, and the current element.
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</dd>
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<dt>state</dt>
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<dd>
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The initial state of the fold.
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</dd>
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<dt>seq</dt>
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<dd>
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The <i>seq</i> to be folded.
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</dd>
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</dl>
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<h4>
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Remarks
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</h4>
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<div>
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For the <i>seq</i>, (<i>0</i>)(<i>1</i>)(<i>2</i>), this macro expands to:
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<div>
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<i>op</i>(<i>s</i>, <i>op</i>(<i>s</i>, <i>op</i>(<i>s</i>, <i>state</i>, <i>2</i>),
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<i>1</i>), <i>0</i>)
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</div>
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</div>
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<div>
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For maximum efficiency, <b>BOOST_PP_SEQ_FOLD_RIGHT</b> can be reentered with <b>BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></b>.
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</div>
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<h4>
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See Also
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</h4>
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<ul>
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<li>
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<a href="seq_fold_right_s.html">BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></a></li>
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</ul>
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<h4>
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Requirements
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</h4>
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<div>
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<b>Header:</b> <a href="../headers/seq/fold_right.html"><boost/preprocessor/seq/fold_right.hpp></a>
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</div>
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<h4>
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Sample Code
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</h4>
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<div>
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<pre>
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#include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
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#include <<a href="../headers/seq/elem.html">boost/preprocessor/seq/elem.hpp</a>>
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#include <<a href="../headers/seq/fold_right.html">boost/preprocessor/seq/fold_right.hpp</a>>
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#include <<a href="../headers/seq/pop_back.html">boost/preprocessor/seq/pop_back.hpp</a>>
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#define SEQ (t)(s)(o)(o)(b)
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#define OP(s, state, x) <a href="cat.html">BOOST_PP_CAT</a>(state, x)
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<a href="seq_fold_right.html">BOOST_PP_SEQ_FOLD_RIGHT</a>(OP, <a href="seq_elem.html">BOOST_PP_SEQ_ELEM</a>(4, SEQ), <a href="seq_pop_back.html">BOOST_PP_SEQ_POP_BACK</a>(SEQ)) // expands to boost
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</pre>
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</div>
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<hr size="1">
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<div style="margin-left: 0px;">
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<i><EFBFBD> Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
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</br><i><EFBFBD> Copyright Paul Mensonides 2002</i>
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</div>
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<div style="margin-left: 0px;">
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<p><small>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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</div>
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</body>
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</html>
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