Thread: Class Compilation Problem

Hey all,

I'm trying to compile some example source code from my MCSE coursework, which is supposed to demonstrate the use of operator overloading. Problem is, VC++ 6.0 SP5 dies. Here's the error I get:

D:\MCSE\Book2\Chapter11\5.cpp(48) : fatal error C1001: INTERNAL COMPILER ERROR
(compiler file 'msc1.cpp', line 1794)
Please choose the Technical Support command on the Visual C++
Help menu, or open the Technical Support help file for more information
Error executing cl.exe.

Now here's the code:

Code:

#include <iostream.h>

class Coordinates
{
	protected:
		int xcoord, ycoord;
	public:
		Coordinates(void);
		Coordinates(int x1, int y1);
		Coordinates operator + (Coordinates inCoord);
		Coordinates operator - (Coordinates *inCoord);
		void show(void);
};

int main(void)
{
	Coordinates Coord1(10, 10), Coord2(2, 2);
	Coordinates Coord3, Coord4;

	cout << "Here are the current values of Coord 1 and 2:\n";
	Coord1.show();
	Coord2.show();

	Coord3 = Coord1 + Coord2;
	Coord4 = Coord1 - &Coord2;

	cout << "Coord1 + Coord2:\n";
	Coord3.show();
	cout << "Coord1 - Coord2:\n";
	Coord4.show();

	return 0;
}

Coordinates::Coordinates(void)
{
	xcoord = 0;
	ycoord = 0;
}

Coordinates::Coordinates(int x1, int y1)
{
	xcoord = x1;
	ycoord = y1;
}

Coordinates::Coordinates::operator + (Coordinates inCoord)
{
	Coordinates temp_coord;
	temp_coord.xcoord = xcoord + inCoord.xcoord;
	temp_coord.ycoord = ycoord + inCoord.ycoord;

	return temp_coord;
}

Coordinates::Coordinates::operator - (Coordinates *inCoord)
{
	Coordinates temp_coord;
	temp_coord.xcoord = xcoord - inCoord->xcoord;
	temp_coord.ycoord = ycoord - inCoord->ycoord;

	return temp_coord;
}

void Coordinates::show(void)
{
	cout << "Value of X coordinate: " << xcoord << endl
		 << "Value of Y coordinate: " << ycoord << endl;
}

After some digging around, I managed to find this Microsoft Knowledge Base Article outlining the problem. However, to be perfectly honest, classes are so new to me, that I don't really know exactly how to fix the problem.

I've tried a few different things with the code now, all of which end up with the same error. Does anyone mind taking a quick look through? I'd be very grateful.

Thanks in advance,

John.

The problem is with your operator + and - overloading. You don't need the scope resolution operator between the return type and class name.

I.E. - You had...

Code:

Coordinates::Coordinates::operator - (Coordinates *inCoord)
{
  Coordinates temp_coord;
  temp_coord.xcoord = xcoord - inCoord->xcoord;
  temp_coord.ycoord = ycoord - inCoord->ycoord;

  return temp_coord;
}

The first line should be..

Code:

Coordinates Coordaintes::operator -(.....

Likewise for the opeartor +


Good Luck.

Oh dear, lol, I feel like such an idiot. Can't believe I didn't spot that. Not even class-related, it's a return-type lol. Ugh, been up all night studying. Thank you very much for pointing that out. One of those days I guess.

--John