error LNK2001

[maroun]

Hello

I have these 2 classes, all classes are in the same header...

class player
{
	class moveit;
public:

	player():pcolor(-2){};
	~player();

	int pcolor;		// player's color
	 stone p_stone[12];  //didnt mention class 'stone'
	 stone eat_move_p[12];

	static void update_stone(int &i, int &j,int &count, int a);		//updates stone
	moveit *pmove;
	

};

class checker
{
public:
	checker();
	~checker();
	static int board[8][8];
	static player *black;
	static player *white;
	static int player_turn;
	bool check_to_eat(int a[8][8],int player_t);
	void print_board(int board[8][8]);
private:
	
	int static const black_count=12;
	int static const white_count=12;


};

This function is declared in player.h , and i want to use the 'player' objects that are declared in checker.h,but I get:

"error LNK2001: unresolved external symbol "public: static class player * checker::white"

error LNK2001: unresolved external symbol "public: static class player * checker::black"

here is the fucntion:

void player::update_stone(int &i,int& j ,int & count, int a)		// updates arrays of stones
				
{
	if(a==0)
		{
			
			checker::black->p_stone[count].i=i;   //HERE
			checker::black->p_stone[count].j=j;   //HERE
			
		}

	if(a==1)
		{
			checker::white->p_stone[count].i=i;   //HERE
			checker::white->p_stone[count].j=j;   //HERE
		}
	count++;
};

I don't understand what to do and why it's happening...

please help !!
Thank you

[maeriden]

When you declare static class members you have to actually create them in some source file. For example in checker.cpp put

player *checker::black = 0; // Better initializing them too
player *checker::white = 0;

Do that for every static variable you have.
Class declarations don't reserve memory for their members.

[AbstractionAnon]

Where is checker instantiated? In order for black and white to be defined, checker must be instantiated somewhere.

[maroun]

Thank you !!! :D