Aleph::HashableByADL Concept Reference

Concept: T provides a semantic hash via ADL. More...

#include <hash-fct.H>

Concept definition

template<typename T>
concept Aleph::HashableByADL =  requires(const T & t)
  {
    { aleph_hash_value(t) } -> std::convertible_to<size_t>;
  }

Detailed Description

Concept: T provides a semantic hash via ADL.

To opt in, define in T's own namespace:

inline size_t aleph_hash_value(const MyType & key) noexcept { ... }

This is the preferred way to add hashing for user-defined types.

Definition at line 869 of file hash-fct.H.