jh::concepts::has_std_hash Concept Reference

Checks whether std::hash<T> is valid and callable. More...

#include <jh/conceptual/hashable.h>

Concept definition

    template<typename T>
    concept has_std_hash = requires(const T& v) {
        { std::hash<T>{}(v) } -> std::convertible_to<size_t>;
    }

Detailed Description

Checks whether std::hash<T> is valid and callable.

Equivalent to:

{ std::hash<T>{}(v) } -> std::convertible_to<size_t>;