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I am making a robot AI thing...well, the AI is stored in an instruction set...I put a robot is in class Robot, now I have begun making a file for executing the instructions..(using a namespace also)...now, the instruction set has to access a robot all the time..therefor you must basically pass a this pointer, but my Robot class is already pretty big..I feel it may be kind of bloated if I were to add the entire instruction set(and parts of the decoder) into the Robot class though ...

what should I do?

My only other idea is to use friend classes(is that possible?) but even then, wouldn't you still need to pass a pointer to the current Robot class!?

You might have been able to build a base class with the primitive functionality such as a memory and the interpretor, then derive a advanced robot class from that which supports the sensory and what not.