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Commit 8f3dcc3

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implementing overloading using friend functions
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  • Learn_CPP_Programming_Deep_Dive/Section 12 Operator Overloading/Operator_overloading_through_friend_functions

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#include <iostream>
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using namespace std;
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/* -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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In C++, a friend function is a function that is not a member of a class but is granted special access to the private and protected members of that class.
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Friend functions are often used when you need to allow an external function or another class to access the private data of a class without making those data members public.
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----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- */
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class Complex
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{
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private:
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int real;
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int imaginary;
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public:
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Complex(int r=0, int i=0) : real(r), imaginary(i)
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{
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cout<<"Parameterized constructor for "<<real<<" +i* "<<imaginary<<endl;
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}
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void display()
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{
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cout<<real<<" +i* "<<imaginary<<endl;
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}
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friend Complex operator+(Complex c1, Complex c2); // this friend function is not a member function of the class , but it can access all members of the class, including private or protected without need to change them to public
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};
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Complex operator+(Complex c1, Complex c2)
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{
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Complex temp;
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temp.real = c1.real +c2.real;
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temp.imaginary = c1.imaginary +c2.imaginary;
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temp.display();
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return temp;
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}
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int main(void)
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{
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Complex c1(5,3),c2(5,7),c3,c4;
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c3 = operator+(c1,c2);
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c3.display();
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c4 = c1 + c2;
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c4.display();
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return 0;
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}

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