hash Structure

The template class defines its method as returning val.hash_code(). The method defines a hash function that is used to map values of type type_index to a distribution of index values.

template<>
    struct hash<type_index>
        : public unary_function<type_index, size_t>
    { // hashes a typeinfo object
    size_t operator()(type_index val) const;
    };
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