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Showing content from https://timsong-cpp.github.io/cppwp/n4659/variant.hash below:

23 General utilities library [utilities]

23 General utilities library [utilities] 23.7 Variants [variant] 23.7.12 Hash support [variant.hash]

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

1 #

The specialization hash<variant<Types...>> is enabled ([unord.hash]) if and only if every specialization in hash<remove_­const_­t<Types>>... is enabled. The member functions are not guaranteed to be noexcept.

template <> struct hash<monostate>;

2 #

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


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