Static member data inaccessible

Hi, I'm making a little Chess program for my first C++ project. I've done a whole lot of programming before, so don't worry.

OK, I have two static variables of the ChessPiece class:

Code:

static uShort whitePieces;
static uShort blackPieces;

And I'm trying to access them in the constructor:

Code:

   if (side == White)
   {
      whitePieces++;
   }
   else
   {
      blackPieces++;
   }

For some reason, my DJGPP gcc compiler (used through RHIDE, my IDE) returns:

undefined reference to 'ChessPiece::whitePieces'
undefined reference to 'ChessPiece::blackPieces'

Oh, and yes I have tried this:

Code:

   if (side == White)
   {
      ChessPiece::whitePieces++;
   }
   else
   {
      ChessPiece::blackPieces++;
   }

Same problem. Can anyone solve this?

Can post the entire code file, well at least the full implemintation of ChessPiece class?
Do you have the constructor declaired in the class before the vars?

ie
class ChessPiece
{
public:
ChessPiece()
{
whitePiece++;
}

private:

static int whitePiece;

}; //end class ChessPiece

If your code looks like that, put the private/protected section before the public section

"Some C++ compilers originally allowed static member variables to be automatically declared while others required an external declaration, due to conflict the standard now strictly states that any static members must be redeclared outside the class." - C++ Standard Reference

This was a problem for me once, here is an example of how to use statics inside a class

Code:

	
PHP Code:
	

class example{
     private:
         static int i_A, i_B;
         /*Other stuff*/
     public:
         example();
         /*Other Stuff*/
};

/*static?*/ int example::i_A, example::i_B; 

After you close your class definition with }; you need to redeclare the variables as i have done (i forget if the keyword static should be there so i have commented it out, test it both ways and see which one works, i feel like it probably isn't supposed to be there.