# Standard library header <typeindex>

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< cpp‎ | header

This header is part of the types support library.

### Classes

type_index (C++11) | wrapper around a `type_info` object, that can be used as index in associative and unordered associative containers (class)
std::hash<std::type_index> (C++11) | hash support for std::type_index (class template specialization)

##### Forward declarations

Defined in header `<functional>`
hash (C++11) | hash function object (class template)

### Synopsis

    namespace std {
        class type_index;
        template <class T> struct hash;
        template<> struct hash<type_index>;
    }

#### Class std::type_index

    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;
        const char* name() const;
    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.
    };

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