std::hash(std::experimental::string_view,std::experimental::wstring_view, (3) Linux Manual Page

std::hash(std::experimental::string_view,std::experimental::wstring_view, – std::hash(std::experimental::string_view,std::experimental::wstring_view,

Synopsis

Defined in header<experimental / string_view>

    template <>
    struct hash<std::experimental::string_view>;

template<> struct hash<std::experimental::wstring_view>;    (library fundamentals
template<> struct hash<std::experimental::u16string_view>;  TS)

template <>
struct hash<std::experimental::u32string_view>;

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

See also

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