The keyword “friend” is placed only in the function declaration of the friend function and not in the function definition. When the friend function is called neither the name of the object nor the dot operator
In this C++ tutorial, you will learn what is a Friend Function, how to declare a friend function, and how to access private and protected members from a friend function, with examples. C++ Friend Function C++ Friend Function can access private and protected members (variables and methods) of ...
friendvoiddisplay(demo};//Friend function declaration }; voiddisplay(demo dd1) { cout<
Here is the following code for Function Friend in C++:Open Compiler #include <iostream> using namespace std; class Box { double width; public: friend void printWidth( Box box ); void setWidth( double wid ); }; // Member function definition void Box::setWidth( double wid ) { width =...
The following example shows aPointclass and a friend function,ChangePrivate. Thefriendfunction has access to the private data member of thePointobject it receives as a parameter. Example // friend_functions.cpp // compile with: /EHsc #include <iostream> using namespace std; class Point { frien...
Class member functions can be declared as friends in other classes. Consider the following example: C++ // classes_as_friends1.cpp// compile with: /cclassB;classA{public:intFunc1( B& b );private:intFunc2( B& b ); };classB{private:int_b;// A::Func1 is a friend function to cla...
two.cc: In member function âvoid TWO::print(ONE&)â: two.cc:4: error: invalid use of incomplete type âstruct ONEâ two.h:4: error: forward declaration of âstruct ONEâ two.cc:5: error: invalid use of incomplete type âstruct ONEâ ...
In the main function, an object is created, s1, and showData(s1) is used to print the private data. Example 2: Add Members of Two Different Classes The friend function is used to access and manipulate the data from multiple classes. Cpp 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
//Class Volume to demonstrate the concept of Friend Function in CPP class Volume { //Member variables are declared as private and hence cannot be simply accessed from outside the class private: int liter; //Initializing the value of variable liter to 2 using the default constructor ...
Class member functions can be declared as friends in other classes. Consider the following example: C++ // classes_as_friends1.cpp// compile with: /cclassB;classA{public:intFunc1( B& b );private:intFunc2( B& b ); };classB{private:int_b;// A::Func1 is a friend function to cla...