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            Returns the result type of filter_if given the sequence
            and unary MPL
            Lambda Expression predicate type.
          
template< typename Sequence, typename Pred > struct filter_if { typedef unspecified type; };
Table 1.88. Parameter
| Parameter | Requirement | Description | 
|---|---|---|
| 
                       | A model of Forward Sequence | Operation's argument | 
| 
                       | A unary MPL Lambda Expression | Type to retain | 
result_of::filter_if<Sequence, Pred>::type
Return type:
Sequence
                implements the Associative
                Sequence model.
              
            Semantics: Returns a sequence containing
            the elements of Sequence
            for which Pred evaluates
            to boost::mpl::true_.
          
Constant.
#include <boost/fusion/algorithm/transformation/filter_if.hpp> #include <boost/fusion/include/filter_if.hpp>