what is the concept of operator overloading

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I have written a program in TC compiler..and getting an error but could not understand

C++

#include<iostream.h>
#include<conio.h>
class aman
{
	int real;
	int imag;
	public : aman(int a,int b)
		{
			real=a;
			imag=b;
		}
	       void showdata()
		{
			cout<<real<<"+i"<<imag<<endl;
		}
		 aman operator+(aman);
};
       aman aman::operator + (aman c)
	      {

		aman temp;

		temp.real=real+ c.real;
		temp.imag=imag+ c.imag;
		return (temp);
	      }
void main()
{
	clrscr();
	aman d,e,f;
       d=aman (5,6);
       e= aman (6,9);
	f=d+e;
	d.showdata();
	cout<<"a is";
	e.showdata();
	cout<<"b is";
	f.showdata();

	cout<<"f=d+e is:"<<endl;
	f.showdata();
	getch();
}

Error: could not find match for ‘aman::aman()’

and it is pointing on

C++

aman aman::operator + (aman c)
	      {

		aman temp;
		temp.real=real+ c.real;
		temp.imag=imag+ c.imag;
		return (temp);
	      }

Thanks in advance

Posted 3-Nov-11 1:19am

shivani 2013

Updated 3-Nov-11 1:24am

André Kraak

v2

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2 solutions

Solution 2

You should also be passing by reference or pointer into the + operator function.
Pass by value is the default, and is what is happening here. This creates a full copy of the variable, then calls the function with this copy, then deletes the copy. Pass by reference and pass by pointer just pass a copy of the memory address. This is quicker, especially for classes which hold lots of data

C++

class aman {
	//other functions here
	aman operator +(const aman&);
};

aman aman::operator +(const aman &c) {
	aman temp;
	temp.real = real + c.real;
	temp.imag = imag + c.imag;
	return (temp);
}

Posted 3-Nov-11 6:12am

Andrew Brock

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TinyDevices · Accepted Answer · 2011-11-03T02:02:00

Solution 1

Once you provide a parameterized constructor, the compiler doesnt provide you the default plain one. You need to define your plain ctor manually.

aman::aman()
{
}

Posted 3-Nov-11 2:02am

TinyDevices

Comments

shivani 2013 3-Nov-11 8:27am

Thank you,the program has been run but I am not getting one thing that why compiler doesn't provide default one.........as i have read that default constructors are automatically called.

ShilpiP 3-Nov-11 8:47am

Compiler automatically created default constructor if you are not creating any constructor else not.