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[SVN r16152]
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Paul Mensonides
2002-11-08 02:12:35 +00:00
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<html>
<head>
<title>BOOST_PP_SEQ_FOLD_RIGHT</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_SEQ_FOLD_RIGHT</b> macro folds (or accumulates) the elements of
a <i>seq</i> right-to-left.
</div>
<h4>
Usage
</h4>
<div class="code">
<b>BOOST_PP_SEQ_FOLD_RIGHT</b>(<i>op</i>, <i>state</i>, <i>seq</i>)
</div>
<h4>
Arguments
</h4>
<dl>
<dt>op</dt>
<dd>
A ternary operation of the form <i>op</i>(<i>s</i>, <i>state</i>, <i>elem</i>).&nbsp;
This macro is called for each element in <i>seq</i>--each time returning a new <i>state</i>.&nbsp;
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>
<div>
For maximum efficiency, <b>BOOST_PP_SEQ_FOLD_RIGHT</b> can be reentered with <b>BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></b>.
</div>
<h4>
See Also
</h4>
<ul>
<li>
<a href="seq_fold_right_s.html">BOOST_PP_SEQ_FOLD_RIGHT_<i>s</i></a></li>
</ul>
<h4>
Requirements
</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/seq/fold_right.hpp.html">&lt;boost/preprocessor/seq/fold_right.hpp&gt;</a>
</div>
<h4>
Sample Code
</h4>
<div>
<pre>
#include &lt;<a href="../headers/cat.hpp.html">boost/preprocessor/cat.hpp</a>&gt;
#include &lt;<a href="../headers/seq/elem.hpp.html">boost/preprocessor/seq/elem.hpp</a>&gt;
#include &lt;<a href="../headers/seq/fold_right.hpp.html">boost/preprocessor/seq/fold_right.hpp</a>&gt;
#include &lt;<a href="../headers/seq/pop_back.hpp.html">boost/preprocessor/seq/pop_back.hpp</a>&gt;
#define SEQ (t)(s)(o)(o)(b)
#define OP(s, state, x) <a href="cat.html">BOOST_PP_CAT</a>(state, x)
<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
</pre>
</div>
</body>
</html>