jh::concepts::has_adl_hash Concept Reference

Checks whether a free (ADL-discoverable) hash() function exists. More...

#include <jh/conceptual/hashable.h>

Concept definition

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

Detailed Description

Checks whether a free (ADL-discoverable) hash() function exists.

This allows user-defined global hash functions to participate in resolution without specializing std::hash or modifying the type.

size_t hash(const MyType& t);