...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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 1.73. Parameter
Parameter |
Requirement |
Description |
---|---|---|
Sequence |
A model of Forward Sequence |
Operation's argument |
T |
Any type |
Type to retain |
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.
Constant.
#include <boost/fusion/algorithm/transformation/filter.hpp> #include <boost/fusion/include/filter.hpp>