class A {
private:
int key;
// give class B access to class A
friend class B;
};
class B {
// new object from class A
A new_a;
void fn(){
// access private value from class B
new_a.key;
}
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
}// Add members of two different classes using friend functions
#include <iostream>
using namespace std;
// forward declaration
class ClassB;
class ClassA {
public:
// constructor to initialize numA to 12
ClassA() : numA(12) {}
private:
int numA;
// friend function declaration
friend int add(ClassA, ClassB);
};
class ClassB {
public:
// constructor to initialize numB to 1
ClassB() : numB(1) {}
private:
int numB;
// friend function declaration
friend int add(ClassA, ClassB);
};
// access members of both classes
int add(ClassA objectA, ClassB objectB) {
return (objectA.numA + objectB.numB);
}
int main() {
ClassA objectA;
ClassB objectB;
cout << "Sum: " << add(objectA, objectB);
return 0;
}// C++ program to demonstrate the working of friend class
#include <iostream>
using namespace std;
// forward declaration
class ClassB;
class ClassA {
private:
int numA;
// friend class declaration
friend class ClassB;
public:
// constructor to initialize numA to 12
ClassA() : numA(12) {}
};
class ClassB {
private:
int numB;
public:
// constructor to initialize numB to 1
ClassB() : numB(1) {}
// member function to add numA
// from ClassA and numB from ClassB
int add() {
ClassA objectA;
return objectA.numA + numB;
}
};
int main() {
ClassB objectB;
cout << "Sum: " << objectB.add();
return 0;
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
}class ClassB;
class ClassA {
// ClassB is a friend class of ClassA
friend class ClassB;
... .. ...
}
class ClassB {
... .. ...
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