24 Strings library [strings]

24.4 String view classes [string.view]

24.4.5 Hash support [string.view.hash]

template<> struct hash<string_view>; template<> struct hash<u16string_view>; template<> struct hash<u32string_view>; template<> struct hash<wstring_view>;

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The specialization is enabled ([unord.hash]). [ Note: The hash value of a string view object is equal to the hash value of the corresponding string object ([basic.string.hash]).  — end note ]