Range-v3
Range algorithms, views, and actions for the Standard Library
ranges::count_if_fn Struct Reference

Public Member Functions

template<typename I , typename S , typename R , typename P = identity>
auto operator() (I begin, S end, R pred, P proj=P{}) const -> iter_difference_t< I > requires input_iterator< I > &&sentinel_for< S, I > &&indirect_unary_predicate< R, projected< I, P >>
 
template<typename Rng , typename R , typename P = identity>
auto operator() (Rng &&rng, R pred, P proj=P{}) const -> iter_difference_t< iterator_t< Rng >> requires input_range< Rng > &&indirect_unary_predicate< R, projected< iterator_t< Rng >, P >>