namespace std { class type_index { public: type_index(const type_info& rhs) noexcept; bool operator==(const type_index& rhs) const noexcept; bool operator!=(const type_index& rhs) const noexcept; bool operator< (const type_index& rhs) const noexcept; bool operator<= (const type_index& rhs) const noexcept; bool operator> (const type_index& rhs) const noexcept; bool operator>= (const type_index& rhs) const noexcept; size_t hash_code() const noexcept; const char* name() const noexcept; private: const type_info* target; // exposition only // Note that the use of a pointer here, rather than a reference, // means that the default copy/move constructor and assignment // operators will be provided and work as expected. }; }
The class type_index provides a simple wrapper for type_info which can be used as an index type in associative containers ([associative]) and in unordered associative containers ([unord]).