hash Structure


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The latest version of this topic can be found at 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;