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- <html>
- <head>
- <title>BOOST_PP_SEQ_FOLD_RIGHT_s</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
- </head>
- <body>
- <div style="margin-left: 0px;">
- The <b>BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></b> macro folds (or accumulates) the
- elements of a <i>seq</i> right-to-left. It reenters <b>BOOST_PP_SEQ_FOLD_RIGHT</b>
- with maximum efficiency.
- </div>
- <h4>
- Usage
- </h4>
- <div class="code">
- <b>BOOST_PP_SEQ_FOLD_RIGHT_</b> ## <i>s</i>(<i>op</i>, <i>state</i>, <i>seq</i>)
- </div>
- <h4>
- Arguments
- </h4>
- <dl>
- <dt>s</dt>
- <dd>
- The next available <b>BOOST_PP_SEQ_FOLD_LEFT</b> fold step.
- </dd>
- <dt>op</dt>
- <dd>
- A ternary operation of the form <i>op</i>(<i>s</i>, <i>state</i>, <i>elem</i>).
- This macro is called for each element in <i>seq</i>--each time returning a new <i>state</i>.
- This operation is expanded by <b>BOOST_PP_SEQ_FOLD_RIGHT</b> with the next
- available fold step, the current <i>state</i>, and the current element.
- </dd>
- <dt>state</dt>
- <dd>
- The initial state of the fold.
- </dd>
- <dt>seq</dt>
- <dd>
- The <i>seq</i> to be folded.
- </dd>
- </dl>
- <h4>
- Remarks
- </h4>
- <div>
- For the <i>seq</i>, (<i>0</i>)(<i>1</i>)(<i>2</i>), this macro expands to:
- <div>
- <i>op</i>(<i>s</i>, <i>op</i>(<i>s</i>, <i>op</i>(<i>s</i>, <i>state</i>, <i>2</i>),
- <i>1</i>), <i>0</i>)
- </div>
- </div>
- <h4>
- See Also
- </h4>
- <ul>
- <li>
- <a href="seq_fold_right.html">BOOST_PP_SEQ_FOLD_RIGHT</a></li>
- </ul>
- <h4>
- Requirements
- </h4>
- <div>
- <b>Header:</b> <a href="../headers/seq/fold_right.html"><boost/preprocessor/seq/fold_right.hpp></a>
- </div>
- <h4>
- Sample Code
- </h4>
- <div>
- <pre>
- #include <<a href="../headers/cat.html">boost/preprocessor/cat.hpp</a>>
- #include <<a href="../headers/seq/fold_left.html">boost/preprocessor/seq/fold_left.hpp</a>>
- #include <<a href="../headers/seq/fold_right.html">boost/preprocessor/seq/fold_right.hpp</a>>
- #include <<a href="../headers/seq/seq.html">boost/preprocessor/seq/seq.hpp</a>>
- #define S1 (a)(b)(c)
- #define S2 (S1)(S1)(S1)
- #define OP(s, state, x) state (<a href="seq_fold_left_s.html">BOOST_PP_SEQ_FOLD_RIGHT_</a> ## s(OP_2, _, x))
- #define OP_2(s, state, x) <a href="cat.html">BOOST_PP_CAT</a>(state, x)
- <a href="seq_fold_left.html">BOOST_PP_SEQ_FOLD_LEFT</a>(OP, <a href="seq_nil.html">BOOST_PP_SEQ_NIL</a>, S2)
- // expands to (_cba)(_cba)(_cba)
- </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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