A friend function : friend function « Class « C++ Tutorial

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C++ Tutorial » Class » friend function 
9.22.1.A friend function
#include <iostream> 
using namespace std; 
 
class MyClass 
  int a, b; 
public
  MyClass(int i, int j) { a=i; b=j; 
  friend int friendFunction(MyClass x)// a friend function 
}
 
// friendFunction() is a not a member function of any class. 
int friendFunction(MyClass x

  /* Because friendFunction() is a friend of MyClass, it can 
     directly access a and b. */ 
  int max = x.a < x.b ? x.a : x.b; 
 
  return max; 

 
int main() 

  MyClass n(18111)
 
  cout << "friendFunction(n) is " << friendFunction(n<< "\n"
 
  return 0
}
friendFunction(n) is 18
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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