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            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; };
Table 1.65. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
| 
                       | 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> #include <boost/fusion/include/count_if.hpp>