jh::concepts::extended_hashable Concept Reference

Concept for types that can be hashed through any supported mechanism. More...

#include <jh/conceptual/hashable.h>

Concept definition

    template<typename T>
    concept extended_hashable =
    has_std_hash<T> || has_adl_hash<T> || has_mbr_hash<T>

Detailed Description

Concept for types that can be hashed through any supported mechanism.

A type T satisfies extended_hashable if it supports at least one of the following:

1. std::hash<T> specialization
2. ADL-discoverable hash() free function
3. Member function T::hash()

The precedence follows:

std::hash<T>{}(t) > hash(t) > t.hash()

This ensures that standard hash behavior dominates if explicitly defined, while still enabling semantic extensions and user customization.