163. Abstraction

Question.2

A developer defines a motor interface:

class IMotor {
public:
   virtual void setSpeed(int speed) = 0;
   virtual void stop() = 0;
   virtual ~IMotor() = default;
};

void emergency_shutdown(IMotor* m) {
   m->stop();
}

Why does emergency_shutdown take IMotor instead of a specific motor type?

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IMotor* is faster than a concrete type
IMotor uses less memory
Concrete types cannot be passed to functions
The function works with ANY motor (DC, stepper, servo) -- it depends on the abstraction (interface), not the implementation; new motor types work without changing this code

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