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Use this function to get the number of mouse input devices available.
This API is not limited to mice. Should it say pointing" or similar instead to specify the type of input device (ie: not a keyboard) without being overly specific?"
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information. ??? Source?
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Would it be helpful to mention the types of input devices it would or would not count?