Return Object
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The program below shows the different implementations how the object is returned from the function by value and by reference.
#include<iostream>
using namespace std;
class Sample
{
int data;
public:
Sample():data(0){cout<<"default constructor"<<endl;}
Sample(int d):data(d){cout<<"one agr constr.."<<endl;}
void Display()
{
cout<<"data= "<<data<<endl;
}
Sample ReturnObjectVal()
{
return *this;
}
Sample& ReturnObjectRef()
{
return *this;
}
Sample(Sample& s)
{
this->data = s.data;
cout<<"in the copy constructor.."<<endl;
}
void operator ++()
{
this->data++;
}
void operator ++( int)
{
cout<<"post increment"<<endl;
this->data++;
}
~Sample(){cout<<"in the destructor"<<endl; }
/* Sample& operator = (Sample& s)
{
this->data = s.data;
cout<<"inside the overloaded assignment operator function.."<<endl;
return *this;
}*/
};
int main()
{
Sample s, s1(100),s2(200);
s1 = s.ReturnObjectVal();
s1.ReturnObjectRef() = s2;
s2++;
s.Display();
s1.Display();
s2.Display();
/* s1 = s2=s;
s++;
s.Display();
s1.Display();*/
}
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