std::hash (std::experimental::string_view, std::experimental::wstring_view, std::experimental::u16string_view, std::experimental::u32string_view)
From cppreference.com
                    
                                        
                    < cpp | experimental | basic string view
                    
                                                            
                    | Defined in header  <experimental/string_view> | ||
| template<> struct hash<std::experimental::string_view>; template<> struct hash<std::experimental::wstring_view>; | (library fundamentals TS) | |
Template specializations of std::hash for the various view classes for hashing views.
[edit] See also
| (C++11) | hash function object (class template) | 


