forked from boostorg/preprocessor
56 lines
1.8 KiB
HTML
56 lines
1.8 KiB
HTML
<HTML><HEAD><TITLE>Boost PREPROCESSOR library</TITLE><BODY bgcolor="#FFFFFF">
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<a href="index.htm"><IMG height=86 alt="c++boost.gif (8819 bytes)" src="../../../../c++boost.gif" width=277 align=center></a>
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<H1>#include <<a href="../../../../boost/preprocessor/list/fold_left.hpp">boost/preprocessor/list/fold_left.hpp</a>></H1>
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<H2><a name="BOOST_PP_LIST_FOLD_LEFT">#define BOOST_PP_LIST_FOLD_LEFT</a>(F,P,L)</H2>
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<P>Iterates F(D,P,X) for each element X of the list L (from the left or the start of the list).</P>
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<P>In other words,</P>
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<PRE>
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<a href="list_fold_left.htm#BOOST_PP_LIST_FOLD_LEFT">BOOST_PP_LIST_FOLD_LEFT</a>(F,P,L)
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</PRE>
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<P>expands to:</P>
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<PRE>
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F
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( D
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, ... 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)) ...
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, <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))
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)
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</PRE>
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<H3>Note</H3>
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<P>Folding, or accumulation, is a very general pattern of computation.
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Most list operations can be implemented in terms of folding.</P>
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<H3>See</H3>
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<UL>
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<LI><a href="list_fold_right.htm#BOOST_PP_LIST_FOLD_RIGHT">BOOST_PP_LIST_FOLD_RIGHT</a>()
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</UL>
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<H3>Uses</H3>
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<UL>
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<LI><a href="while.htm#BOOST_PP_WHILE">BOOST_PP_WHILE</a>()
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</UL>
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<hr>
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<p>(C) Copyright Housemarque Oy 2002</p>
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<p>Permission to copy, use, modify, sell and distribute this document is granted
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provided this copyright notice appears in all copies. This document is provided
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"as is" without express or implied warranty, and with no claim as to its suitability
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for any purpose.</p>
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<p>Generated: <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan --><!--webbot bot="Timestamp" endspan i-checksum="15246" --></p>
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