# std::hash (std::string_view, std::wstring_view, std::u16string_view, std::u32string_view)

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< cpp‎ | string‎ | basic string view

Defined in header `<string_view>` |  |
template<> struct hash<std::string_view>; |  | (since C++17)
template<> struct hash<std::wstring_view>; |  | (since C++17)
template<> struct hash<std::u8string_view>; |  | (since C++20)
template<> struct hash<std::u16string_view>; |  | (since C++17)
template<> struct hash<std::u32string_view>; |  | (since C++17)

Template specializations of std::hash for the various view classes for hashing views.

These hashes equal the hashes of corresponding std::basic_string classes: If S is one of the standard basic_string types, SV is the corresponding string view type, and s is an object of type S, then std::hash<S>()(s) == std::hash<SV>()(SV(s)).

### See also

hash (C++11) | hash function object (class template)

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