NAME¶

std::indirect_unary_predicate - std::indirect_unary_predicate

Synopsis¶

Defined in header <iterator>
template<class F, class I>

concept indirect_unary_predicate =
std::indirectly_readable<I> &&
std::copy_constructible<F> && (since C++20)
std::predicate<F&, std::iter_value_t<I>&> &&
std::predicate<F&, std::iter_reference_t<I>> &&

std::predicate<F&, std::iter_common_reference_t<I>>;

The concept indirect_unary_predicate specifies requirements for algorithms that call
unary predicates as their arguments. The key difference between this concept and
std::predicate is that it is applied to the type that I references, rather than I
itself.

Semantic requirements

F and I model indirect_unary_predicate only if all concepts it subsumes are modeled.