friend Class in C++

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SAMER SAEID answered on September 1, 2021 Popularity 9/10 Helpfulness 2/10

answer friend Class in C++

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friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 2/10 Language cpp

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Contributed on Jun 13 2022

SAMER SAEID

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c++ friend class

Comment

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;
    }
}

Popularity 10/10 Helpfulness 3/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++

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Contributed on Apr 03 2022

ocean

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c++ friend function

Comment

class Rectangle {
public:
  Rectangle(int width, int height) : width_(width), height_(height) {}

  friend int area(const Rectangle& rect);

private:
  int width_, height_;
};

int area(const Rectangle& rect) {
  return rect.width_ * rect.height_;
}

int main() {
  Rectangle rect(3, 4);
  int a = area(rect);
  return 0;
}

The main function creates a Rectangle object and then calls the area function with the object as its argument. Because the area function is a friend function of the Rectangle class, it has access to the private members of the object and can calculate the area of the rectangle.

By using friend functions in C++, you can provide access to the private and protected members of a class to functions that are not members of the class, while still maintaining the encapsulation of the class's data.

Popularity 10/10 Helpfulness 3/10 Language cpp

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Tags: c++

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Contributed on Mar 07 2023

SubZero

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friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Jun 13 2022

SAMER SAEID

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friend function in c++

Comment

class className{
  // Other Declarations
  friend returnType functionName(arg list);
};

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: www.section.io

Tags: c++

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Contributed on Sep 01 2021

Fierce Fish

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Syntax of friend function in c++

Comment

class className {
    ... .. ...
    friend returnType functionName(arguments);
    ... .. ...
}

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: www.mygreatlearning.com

Tags: c++

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Contributed on Feb 24 2023

Sehrish Zarin

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friend function in c++

Comment

// Program to illustrate friend function

#include<iostream>

using namespace std;

class integer
{
  int a, b;
  public:
    void set_value()
    {
    a=50;
    b=30;
    }
  friend int mean(integer s);  //declaration of friend function
};

int mean(integer s)
{
  return int(s.a+s.b)/2.0; //friend function definition
}
int main()
{
  integer c;
  c.set_value();
  cout<< "Mean value:" <<mean(c);
  return 0;
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: www.section.io

Tags: c++

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Contributed on May 19 2022

Shahjahan Ansari

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C++ friend keyword -3 (friend class)

Comment

// 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;
}
//Sum: 13

Popularity 8/10 Helpfulness 2/10 Language cpp

Source: www.programiz.com

Tags: c++ friend

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Contributed on Sep 19 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

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friend Class in C++

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c++ friend class

c++ friend function

friend Class in C++

friend function in c++

Syntax of friend function in c++

friend function in c++

C++ friend keyword -3 (friend class)

friend Class in C++

friend Class in C++

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