Boost C++ Libraries

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filter
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;
};

Table 1.85. Parameter

Parameter

Requirement

Description

Sequence

A model of Forward Sequence

Operation's argument

T

Any type

Type to retain


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

Return type:

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

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