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hash Structure (STL)

Defines a member function that returns a value that's uniquely determined by Val. The member function defines a hash function that's suitable for mapping values of type thread::id to a distribution of index values.

struct hash<thread::id> : 
   public unary_function<thread::id, size_t>
   size_t operator()(thread::id Val) const;

Header: thread

Namespace: std

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