#include <range/v3/view/filter.hpp>
 Inheritance diagram for ranges::views::filter_fn:
 Inheritance diagram for ranges::views::filter_fn:| Public Member Functions | |
| template<typename Pred > | |
| constexpr auto | operator() (Pred pred) const | 
| template<typename Pred , typename Proj > requires (!range<Pred>) | |
| constexpr auto | operator() (Pred pred, Proj proj) const | 
|  Public Member Functions inherited from ranges::views::filter_base_fn | |
| template<typename Rng , typename Pred , typename Proj > requires viewable_range<Rng> && input_range<Rng> && indirect_unary_predicate<Pred, projected<iterator_t<Rng>, Proj>> | |
| constexpr filter_view< all_t< Rng >, composed< Pred, Proj > > | operator() (Rng &&rng, Pred pred, Proj proj) const | 
|  Public Member Functions inherited from ranges::views::cpp20_filter_base_fn | |
| template<typename Rng , typename Pred > requires viewable_range<Rng> && input_range<Rng> && indirect_unary_predicate<Pred, iterator_t<Rng>> | |
| constexpr filter_view< all_t< Rng >, Pred > | operator() (Rng &&rng, Pred pred) const | 
| Related Functions | |
| (Note that these are not member functions.) | |
| constexpr filter_fn | filter {} | 
The filter view takes in a predicate function T -> bool and converts an input range of T into an output range of T by keeping all elements for which the predicate returns true.
filter_func
input_range
Toutput_range
forward_range or the concept satisfied by the inputcommon_range if the input is a common_rangesized_range or borrowed_rangeT