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The class template 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.
Syntax
template <> struct hash<type_index>
: public unary_function<type_index, size_t>
{ // hashes a typeinfo object
size_t operator()(type_index val) const;
};
Specialized Types
<system_error>
template <class T> struct hash;
template <> struct hash<error_code>;
template <> struct hash<error_condition>;