count_if

A metafunction that returns the result type of count_if given the sequence and predicate types.

template<
    typename Sequence,
    typename Pred
    >
struct count_if
{
    typedef int type;
};

Parameter	Requirement	Description
`Sequence`	A model of Forward Sequence	Operation's argument
`Pred`	A unary function object	Operation's argument

result_of::count_if<Sequence, Pred>::type

Return type: int.

Semantics: Returns the return type of count_if. The return type is always int.

Constant.

#include <boost/fusion/algorithm/query/count_if.hpp>