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<HTML><HEAD><TITLE>Boost PREPROCESSOR library</TITLE><BODY bgcolor="#FFFFFF">
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<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
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<h1 align="center">Boost.Preprocessor</h1>
<h2 align="center">Reference</h2>
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<hr>
<H1>#include &lt;<a href="../../../../boost/preprocessor/list/fold_left.hpp">boost/preprocessor/list/fold_left.hpp</a>&gt;</H1>
<a href="list_first_n.htm">Prev</a> <a href="list_fold_right.htm">Next</a> <a href="index.htm#Macros">Macros</a> <a href="index.htm#Headers">Headers</a>
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<h1>#include &lt;<a href="../../../../boost/preprocessor/list/fold_left.hpp">boost/preprocessor/list/fold_left.hpp</a>&gt;</h1>
<hr>
<H2><a name="BOOST_PP_LIST_FOLD_LEFT">#define BOOST_PP_LIST_FOLD_LEFT</a>(F,P,L)</H2>
<P>Iterates F(D,P,X) for each element X of the list L (from the left or the start of the list).</P>
<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,</P>
<p>In other words, expands to:</p>
<PRE>
<a href="list_fold_left.htm#BOOST_PP_LIST_FOLD_LEFT">BOOST_PP_LIST_FOLD_LEFT</a>(F,P,L)
</PRE>
<P>expands to:</P>
<PRE>
<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>
</pre>
<H3>Note</H3>
<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>
<P>Folding, or accumulation, is a very general pattern of computation.
Most list operations can be implemented in terms of folding.</P>
<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>See</H3>
<UL>
<LI><a href="list_fold_right.htm#BOOST_PP_LIST_FOLD_RIGHT">BOOST_PP_LIST_FOLD_RIGHT</a>()
</UL>
<H3>Uses</H3>
<UL>
<LI><a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>()
</UL>
<h3>Uses</h3>
<ul>
<li><a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>()</li>
</ul>
<hr>
<p>(C) Copyright Housemarque Oy 2002</p>
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<p><i>Permission to copy, use, modify, sell and distribute this document is granted
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