NAME¶

std::indirect_binary_predicate - std::indirect_binary_predicate

Synopsis¶

Defined in header <iterator>
template< class F, class I1, class I2 >

concept indirect_binary_predicate =
std::indirectly_readable<I1> &&
std::indirectly_readable<I2> &&
std::copy_constructible<F> &&
std::predicate<F&, std::iter_value_t<I1>&, std::iter_value_t<I2>&> &&
std::predicate<F&, std::iter_value_t<I1>&, std::iter_reference_t<I2>> (since C++20)
&&
std::predicate<F&, std::iter_reference_t<I1>, std::iter_value_t<I2>&>
&&
std::predicate<F&, std::iter_reference_t<I1>,
std::iter_reference_t<I2>> &&

std::predicate<F&, std::iter_common_reference_t<I1>,
std::iter_common_reference_t<I2>>;

The concept indirect_binary_predicate specifies requirements for algorithms that
call binary predicates as their arguments. The key difference between this concept
and std::predicate is that it is applied to the types that I1 and I2 references,
rather than I1 and I2 themselves.

Semantic requirements

F, I1, and I2 model indirect_binary_predicate only if all concepts it subsumes are
modeled.