cppdraft_translate/cppdraft/variant/hash.md

[variant.hash]

22 General utilities library [utilities]

22.6 Variants [variant]

22.6.12 Hash support [variant.hash]

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template<class... Types> struct hash<variant<Types...>>;

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The specialization hash<variant<Types...>> is enabled ([unord.hash]) if and only if every specialization in hash<remove_const_t>... is enabled.

The member functions are not guaranteed to be noexcept.

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template<> struct hash<monostate>;

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The specialization is enabled ([unord.hash]).