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Returns the result type of filter given the sequence type
and type to retain.
template< typename Sequence, typename T > struct filter { typedef unspecified type; };
Table 1.87. Parameter
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward Sequence |
Operation's argument |
|
|
Any type |
Type to retain |
result_of::filter<Sequence, T>::type
Return type:
Sequence
implements the Associative
Sequence model.
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
Constant.
#include <boost/fusion/algorithm/transformation/filter.hpp> #include <boost/fusion/include/filter.hpp>