static class variable problem..

[strongdrink]

Hey everyone,

I'm having issues with static class variables..

Here is my source..

  class Ground {

	protected:
	
	//Amount of ground blox
	static unsigned int amount;
	
        ...

	public:

	//Constructor/Destructor
	Ground (float newXPos, float newYPos, float newXSize, float newYSize);
	//~Ground();	

        ...

};

Ground::Ground (float newXPos, float newYPos, float newXSize, float newYSize) {

	//Up the amount of thingers
	amount++;

        ...

}
  

I get the error..

undefined reference to `Ground::amount'

Im probably just overlooking something.. but yeah thanks for any help

[3hM2Nwbp]

Outside of your class declaration, you'll need to put in:

unsigned int Ground::amount = 0; // or whatever you want it to be. 

The problem that the linker has with your code is that you've declared the static member, but never defined it.

[strongdrink]

ok sweet thanks