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< div class = "titlepage" >< div >< div >< h5 class = "title" >
< 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 = "id594274" ></ a >
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< a href = "count.html#fusion.algorithm.query.functions.count.description" > Description</ a >
</ h6 >
< p >
Returns the number of elements of a given type within a sequence.
</ p >
< a name = "fusion.algorithm.query.functions.count.synopsis" ></ a >< h6 >
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< a name = "id594304" ></ a >
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< a href = "count.html#fusion.algorithm.query.functions.count.synopsis" > Synopsis</ a >
</ h6 >
< 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 = "id594508" ></ a >< p class = "title" >< b > Table </ b ></ p >
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< table class = "table" summary = "Parameters" >
< colgroup >
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< p >
Parameter
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< p >
Requirement
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</ th >
< th >
< p >
Description
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< tt class = "computeroutput" >< span class = "identifier" > seq</ span ></ tt >
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< p >
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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< p >
The sequence to search
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< p >
< tt class = "computeroutput" >< span class = "identifier" > T</ span ></ tt >
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< p >
Any type
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< td >
< p >
The type to count
</ p >
</ td >
</ tr >
</ tbody >
</ table >
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< a name = "fusion.algorithm.query.functions.count.expression_semantics" ></ a >< h6 >
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< a name = "id594701" ></ a >
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< a href = "count.html#fusion.algorithm.query.functions.count.expression_semantics" > Expression
Semantics</ a >
</ h6 >
< 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 >
</ pre >
< p >
< span class = "bold" >< b > Return type</ b ></ span > : < tt class = "computeroutput" >< span class = "keyword" > int</ span ></ tt >
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< p >
< 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 > .
</ p >
< a name = "fusion.algorithm.query.functions.count.complexity" ></ a >< h6 >
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< a name = "id594839" ></ a >
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< a href = "count.html#fusion.algorithm.query.functions.count.complexity" > Complexity</ a >
</ h6 >
< p >
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.
</ p >
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< a name = "id594920" ></ a >
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< a href = "count.html#fusion.algorithm.query.functions.count.header" > Header</ a >
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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 = "id595086" ></ a >
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< a href = "count.html#fusion.algorithm.query.functions.count.example" > Example</ a >
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< 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 © 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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