Description

Returns the result type of filter given the sequence type and type to retain.

Synopsis

template<
    typename Sequence,
    typename T
    >
struct filter
{
    typedef unspecified type;
};

Expression Semantics

result_of::filter<Sequence, T>::type

Return type: A model of Forward Sequence.

Semantics: Returns a sequence containing the elements of Sequence that are of type T. Equivalent to result_of::filter_if<Sequence, boost::is_same<mpl::_, T> >::type.

Complexity

Constant.

Header

#include <boost/fusion/algorithm/transformation/filter.hpp>