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Syntax of friend function in c++

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Sehrish Zarin answered on August 23, 2021 Popularity 10/10 Helpfulness 2/10

answer Syntax of friend function in c++

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Syntax of friend function in c++

Comment

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

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Source: www.mygreatlearning.com

Tags: c++ friend-function syntax whatever

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Contributed on Feb 24 2023

Sehrish Zarin

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c++ friend function

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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

Source: Grepper

Tags: c++

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Contributed on Mar 07 2023

SubZero

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use of friend function

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We require friend functions whenever we have to 
access the private or protected members of a class. This is 
only the case when we do not want to use the objects of that 
class to access these private or protected members.

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Tags: friend-function

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Contributed on Aug 23 2021

Embarrassed Eagle

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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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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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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

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++

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

Syntax of friend function in c++

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Syntax of friend function in c++

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