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os3330

Unresolved external symbol in C++/SDL.

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It's mentioning two files, player.obj and sprite.obj, both classes that "implement" my Locatable class.
player.obj : error LNK2001: unresolved external symbol "public: virtual struct SDL_Rect * __thiscall Locatable::get_offset(void)" (?get_offset@Locatable@@UAEPAUSDL_Rect@@XZ)
sprite.obj : error LNK2001: unresolved external symbol "public: virtual struct SDL_Rect * __thiscall Locatable::get_offset(void)" (?get_offset@Locatable@@UAEPAUSDL_Rect@@XZ)
Here's the Locatable code:
#ifndef LOCATABLE_H
#define LOCATABLE_H

#include "SDL.h"

class Locatable
{
	public:
                // Here, when I put this abstract function in, it creates the                     
                // error in the other classes.
		virtual SDL_Rect* get_offset();
		
		virtual bool check_collision( Locatable*, Locatable* ) =0;
		virtual void draw() =0;
};

#endif // LOCATABLE_H
When I remove that get_offset() function, it runs normally. Is there any link I'm missing?

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