std::hash (std::experimental::string_view, std::experimental::wstring_view, std::experimental::u16string_view, std::experimental::u32string_view)
Min standard notice:
Header: <experimental/string_view>
Template specializations of std::hash for the various view classes for hashing views.
# Declarations
template<> struct hash<std::experimental::string_view>;
template<> struct hash<std::experimental::wstring_view>;
template<> struct hash<std::experimental::u16string_view>;
template<> struct hash<std::experimental::u32string_view>;
(library fundamentals TS)