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< a name = "fusion.algorithm.iteration.metafunctions.fold" > < / a > < a href = "fold.html" title = "fold" > fold< / a > < / h5 > < / div > < / div > < / div >
< a name = "fusion.algorithm.iteration.metafunctions.fold.description" > < / a > < h6 >
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< a name = "id584017" > < / a >
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< a href = "fold.html#fusion.algorithm.iteration.metafunctions.fold.description" > Description< / a >
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Returns the result type of < a href = "../functions/fold.html" title = "fold" > < tt class = "computeroutput" > < span class = "identifier" > fold< / span > < / tt > < / a > .
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< a name = "fusion.algorithm.iteration.metafunctions.fold.synopsis" > < / a > < h6 >
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< a name = "id584067" > < / a >
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< a href = "fold.html#fusion.algorithm.iteration.metafunctions.fold.synopsis" > Synopsis< / a >
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< pre class = "programlisting" >
< span class = "keyword" > template< / span > < span class = "special" > < < / span >
< span class = "keyword" > typename< / span > < span class = "identifier" > Sequence< / span > < span class = "special" > ,< / span >
< span class = "keyword" > typename< / span > < span class = "identifier" > State< / span > < span class = "special" > ,< / span >
< span class = "keyword" > typename< / span > < span class = "identifier" > F< / span > < span class = "special" > > < / span >
< span class = "keyword" > struct< / span > < span class = "identifier" > fold< / span >
< span class = "special" > {< / span >
< span class = "keyword" > typedef< / span > < span class = "emphasis" > < em > unspecified< / em > < / span > < span class = "identifier" > type< / span > < span class = "special" > ;< / span >
< span class = "special" > };< / span >
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< a name = "id584202" > < / a > < p class = "title" > < b > Table<EFBFBD> 1.36.<2E> Parameters< / b > < / p >
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< table class = "table" summary = "Parameters" >
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Parameter
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Requirement
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Description
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< tt class = "computeroutput" > < span class = "identifier" > Sequence< / span > < / tt >
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A model of < a href = "../../../sequence/concepts/forward_sequence.html" title = "Forward
Sequence">Forward
Sequence< / a >
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The sequence to iterate
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< tt class = "computeroutput" > < span class = "identifier" > State< / span > < / tt >
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Any type
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The initial state for the first application of < tt class = "computeroutput" > < span class = "identifier" > F< / span > < / tt >
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< tt class = "computeroutput" > < span class = "identifier" > F< / span > < / tt >
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< tt class = "computeroutput" > < a href = "http://www.boost.org/libs/utility/utility.htm#result_of" target = "_top" > < tt class = "computeroutput" > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > result_of< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > F< / span > < span class = "special" > (< / span > < span class = "identifier" > E< / span > < span class = "special" > ,< / span > < span class = "identifier" > S< / span > < span class = "special" > )> ::< / span > < span class = "identifier" > type< / span > < / tt > is the return type of < tt class = "computeroutput" > < span class = "identifier" > f< / span > < span class = "special" > (< / span > < span class = "identifier" > e< / span > < span class = "special" > ,< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / tt >
for each element < tt class = "computeroutput" > < span class = "identifier" > e< / span > < / tt >
of type < tt class = "computeroutput" > < span class = "identifier" > E< / span > < / tt > in < tt class = "computeroutput" > < span class = "identifier" > seq< / span > < / tt > , and current state < tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt > of type < tt class = "computeroutput" > < span class = "identifier" > S< / span > < / tt >
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The operation to be applied on forward traversal
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< a name = "fusion.algorithm.iteration.metafunctions.fold.expression_semantics" > < / a > < h6 >
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< a name = "id584553" > < / a >
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< a href = "fold.html#fusion.algorithm.iteration.metafunctions.fold.expression_semantics" > Expression
Semantics< / a >
< / h6 >
< pre class = "programlisting" >
< a href = "fold.html" title = "fold" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > fold< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > Sequence< / span > < span class = "special" > ,< / span > < span class = "identifier" > State< / span > < span class = "special" > ,< / span > < span class = "identifier" > F< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span >
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< span class = "bold" > < b > Return type< / b > < / span > : Any type
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< span class = "bold" > < b > Semantics< / b > < / span > : Returns the result of applying
< tt class = "computeroutput" > < span class = "identifier" > fold< / span > < / tt > to a sequence of
type < tt class = "computeroutput" > < span class = "identifier" > Sequence< / span > < / tt > , with an
initial state of type < tt class = "computeroutput" > < span class = "identifier" > State< / span > < / tt >
and binary function object or function pointer of type < tt class = "computeroutput" > < span class = "identifier" > F< / span > < / tt > .
< / p >
< a name = "fusion.algorithm.iteration.metafunctions.fold.complexity" > < / a > < h6 >
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< a name = "id584726" > < / a >
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< a href = "fold.html#fusion.algorithm.iteration.metafunctions.fold.complexity" > Complexity< / a >
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< p >
Linear, exactly < tt class = "computeroutput" > < a href = "../../../sequence/intrinsic/metafunctions/size.html" title = "size" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > size< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > Sequence< / span > < span class = "special" > > ::< / span > < span class = "identifier" > value< / span > < / tt > applications of < tt class = "computeroutput" > < span class = "identifier" > F< / span > < / tt > .
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< a name = "fusion.algorithm.iteration.metafunctions.fold.header" > < / a > < h6 >
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< span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > fusion< / span > < span class = "special" > /< / span > < span class = "identifier" > algorithm< / span > < span class = "special" > /< / span > < span class = "identifier" > iteration< / span > < span class = "special" > /< / span > < span class = "identifier" > fold< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
< span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > fusion< / span > < span class = "special" > /< / span > < span class = "identifier" > include< / span > < span class = "special" > /< / span > < span class = "identifier" > fold< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
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< td align = "right" > < div class = "copyright-footer" > Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt< / a > )
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