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Returns the number of elements of a given type within a sequence.
template<
    typename Sequence,
    typename T
    >
typename result_of::count<Sequence, T>::type count(
    Sequence const& seq, T const& t);
Table 1.57. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | 
                      A model of Forward
                      Sequence,  | The sequence to search | 
| 
                       | Any type | The type to count | 
count(seq, t);
            Return type: int
          
            Semantics: Returns the number of elements
            of type T and equal to
            t in seq.
          
            Linear. At most result_of::size<Sequence>::value
#include <boost/fusion/algorithm/query/count.hpp> #include <boost/fusion/include/count.hpp>
constvector<double,int,int> vec(1.0,2,3); assert(count(vec,2) == 1);