forked from boostorg/preprocessor
83 lines
2.8 KiB
HTML
83 lines
2.8 KiB
HTML
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
|
<title>Boost.Preprocessor - Reference</title>
|
|
</head>
|
|
<body bgcolor="#FFFFFF" link="#0000ff" vlink="#800080">
|
|
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
|
"header">
|
|
<tr>
|
|
<td valign="top" width="300">
|
|
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
|
</td>
|
|
<td valign="top">
|
|
<h1 align="center">Boost.Preprocessor</h1>
|
|
<h2 align="center">Reference</h2>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<hr>
|
|
|
|
<a href="list_first_n.htm">Prev</a> <a href="list_fold_left_2nd.htm">Next</a> <a href="index.htm#Macros">Macros</a> <a href="index.htm#Headers">Headers</a>
|
|
<hr>
|
|
|
|
<h1>#include <<a href="../../../../boost/preprocessor/list/fold_left.hpp">boost/preprocessor/list/fold_left.hpp</a>></h1>
|
|
|
|
<hr>
|
|
|
|
<h2><a name="BOOST_PP_LIST_FOLD_LEFT">#define BOOST_PP_LIST_FOLD_LEFT</a>(F,P,L)</h2>
|
|
<p>Iterates <code>F(D,P,X)</code> for each element <code>X</code> of the
|
|
list <code>L</code> (from the left or the start of the list).</p>
|
|
|
|
<p>In other words, expands to:</p>
|
|
|
|
<pre>
|
|
F
|
|
( D
|
|
, ... F(D, F(D,P,<a href="list_at.htm#BOOST_PP_LIST_AT">BOOST_PP_LIST_AT</a>(L,0)), <a href="list_at.htm#BOOST_PP_LIST_AT">BOOST_PP_LIST_AT</a>(L,1)) ...
|
|
, <a href="list_at.htm#BOOST_PP_LIST_AT">BOOST_PP_LIST_AT</a>(L,<a href="dec.htm#BOOST_PP_DEC">BOOST_PP_DEC</a>(<a href="list_size.htm#BOOST_PP_LIST_SIZE">BOOST_PP_LIST_SIZE</a>(L))
|
|
)
|
|
</pre>
|
|
|
|
<h3>Note</h3>
|
|
<ul>
|
|
<li>Folding, or accumulation, is a very general pattern of computation.
|
|
Most list operations can be implemented in terms of folding.</li>
|
|
</ul>
|
|
|
|
<h3>See</h3>
|
|
<ul>
|
|
<li><a href="list_fold_right.htm#BOOST_PP_LIST_FOLD_RIGHT">BOOST_PP_LIST_FOLD_RIGHT</a>()</li>
|
|
</ul>
|
|
|
|
<h3>Uses</h3>
|
|
<ul>
|
|
<li><a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>()</li>
|
|
</ul>
|
|
|
|
<h3>Test</h3>
|
|
<ul>
|
|
<li><a href="../../test/list_test.cpp">list_test.cpp</a></li>
|
|
</ul>
|
|
|
|
<hr>
|
|
|
|
<h2><a name="BOOST_PP_LIST_FOLD_LEFT_D">#define BOOST_PP_LIST_FOLD_LEFT_D</a>(D,F,P,L)</h2>
|
|
<p>Can be used inside <a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>().</p>
|
|
<hr>
|
|
|
|
<a href="list_first_n.htm">Prev</a> <a href="list_fold_left_2nd.htm">Next</a> <a href="index.htm#Macros">Macros</a> <a href="index.htm#Headers">Headers</a>
|
|
<hr>
|
|
|
|
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan --><!--webbot bot="Timestamp" endspan i-checksum="15246" --></p>
|
|
|
|
<p><i>© Copyright <a href="http://www.housemarque.com">Housemarque Oy</a> 2002</i></p>
|
|
|
|
<p><i>Permission to copy, use, modify, sell and distribute this document is granted
|
|
provided this copyright notice appears in all copies. This document is provided
|
|
"as is" without express or implied warranty, and with no claim as to its suitability
|
|
for any purpose.</i></p>
|
|
|
|
</body></html>
|