friend function « Class « C++ Tutorial

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9.22.friend function
	9.22.1.	A friend function
	9.22.2.	Friend functions can be shared by two or more classes
	9.22.3.	A function can be a member of one class and a friend of another
	9.22.4.	Share friend function between classes
	9.22.5.	friend square() function for Distance
	9.22.6.	Friend functions and operator overloading
	9.22.7.	Friend functions can access private members of a class

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