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friend

The keyword friend grants a nonmember function access to the private members of a class. To specify a friend function, include that function’s prototype in the public section of a class declaration and precede the entire prototype with the keyword friend. For example, in the following class, myfunc( ) is a friend, not a member, of myclass:

class myclass {   // ... public:   friend void myfunc(int a, float b);   // ... };

Keep in mind that a friend function does not have a this pointer because it is not a member of the class.