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< a name = "fusion.algorithm.query.functions.count" > < / a > < a href = "count.html" title = "count" > count< / a > < / h5 > < / div > < / div > < / div >
< a name = "fusion.algorithm.query.functions.count.description" > < / a > < h6 >
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< a name = "id593356" > < / a >
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< a href = "count.html#fusion.algorithm.query.functions.count.description" > Description< / a >
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Returns the number of elements of a given type within a sequence.
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< a name = "fusion.algorithm.query.functions.count.synopsis" > < / a > < h6 >
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< a name = "id593386" > < / a >
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< a href = "count.html#fusion.algorithm.query.functions.count.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" > T< / span >
< span class = "special" > > < / span >
< span class = "keyword" > typename< / span > < a href = "../metafunctions/count.html" title = "count" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > count< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > Sequence< / span > < span class = "special" > ,< / span > < span class = "identifier" > T< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < span class = "identifier" > count< / span > < span class = "special" > (< / span >
< span class = "identifier" > Sequence< / span > < span class = "keyword" > const< / span > < span class = "special" > & < / span > < span class = "identifier" > seq< / span > < span class = "special" > ,< / span > < span class = "identifier" > T< / span > < span class = "keyword" > const< / span > < span class = "special" > & < / span > < span class = "identifier" > t< / span > < span class = "special" > );< / span >
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< a name = "id593590" > < / a > < p class = "title" > < b > Table<EFBFBD> 1.44.<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" > seq< / span > < / tt >
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A model of < a href = "../../../sequence/concepts/forward_sequence.html" title = "Forward
Sequence">Forward
Sequence< / a > , < tt class = "computeroutput" > < span class = "identifier" > e< / span > < span class = "special" > ==< / span > < span class = "identifier" > t< / span > < / tt >
must be a valid expression, convertible to < tt class = "computeroutput" > < span class = "keyword" > bool< / span > < / tt > ,
for each element < tt class = "computeroutput" > < span class = "identifier" > e< / span > < / tt >
in < tt class = "computeroutput" > < span class = "identifier" > seq< / span > < / tt >
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The sequence to search
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< tt class = "computeroutput" > < span class = "identifier" > T< / span > < / tt >
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Any type
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The type to count
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< a name = "fusion.algorithm.query.functions.count.expression_semantics" > < / a > < h6 >
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< a name = "id593782" > < / a >
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< a href = "count.html#fusion.algorithm.query.functions.count.expression_semantics" > Expression
Semantics< / a >
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< pre class = "programlisting" >
< a href = "count.html" title = "count" > < tt class = "computeroutput" > < span class = "identifier" > count< / span > < / tt > < / a > < span class = "special" > (< / span > < span class = "identifier" > seq< / span > < span class = "special" > ,< / span > < span class = "identifier" > t< / span > < span class = "special" > );< / span >
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< span class = "bold" > < b > Return type< / b > < / span > : < tt class = "computeroutput" > < span class = "keyword" > int< / span > < / tt >
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< span class = "bold" > < b > Semantics< / b > < / span > : Returns the number of elements
of type < tt class = "computeroutput" > < span class = "identifier" > T< / span > < / tt > and equal to
< tt class = "computeroutput" > < span class = "identifier" > t< / span > < / tt > in < tt class = "computeroutput" > < span class = "identifier" > seq< / span > < / tt > .
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< a name = "fusion.algorithm.query.functions.count.complexity" > < / a > < h6 >
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< a name = "id593921" > < / a >
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< a href = "count.html#fusion.algorithm.query.functions.count.complexity" > Complexity< / a >
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Linear. At most < 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 > comparisons.
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< a name = "fusion.algorithm.query.functions.count.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" > query< / span > < span class = "special" > /< / span > < span class = "identifier" > count< / 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" > count< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
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< a name = "fusion.algorithm.query.functions.count.example" > < / a > < h6 >
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< a name = "id594168" > < / a >
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< a href = "count.html#fusion.algorithm.query.functions.count.example" > Example< / a >
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< pre class = "programlisting" >
< span class = "keyword" > const< / span > < a href = "../../../container/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "keyword" > double< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > > < / span > < span class = "identifier" > vec< / span > < span class = "special" > (< / span > < span class = "number" > 1.0< / span > < span class = "special" > ,< / span > < span class = "number" > 2< / span > < span class = "special" > ,< / span > < span class = "number" > 3< / span > < span class = "special" > );< / span >
< span class = "identifier" > assert< / span > < span class = "special" > (< / span > < a href = "count.html" title = "count" > < tt class = "computeroutput" > < span class = "identifier" > count< / span > < / tt > < / a > < span class = "special" > (< / span > < span class = "identifier" > vec< / span > < span class = "special" > ,< / span > < span class = "number" > 2< / span > < span class = "special" > )< / span > < span class = "special" > ==< / span > < span class = "number" > 1< / 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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