163. Abstraction

Question.4

A generic Motor interface exposes a stepper-specific method:

class IMotor {
public:
   virtual void setSpeed(int speed) = 0;
   virtual void setMicrosteps(int steps) = 0;  // Stepper-only!
   virtual ~IMotor() = default;
};

A DC motor driver must implement setMicrosteps. What is wrong?

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Nothing -- all motors should support microsteps
Leaky abstraction -- a stepper-specific detail leaked into the generic interface; DC motors have no microsteps, forcing a meaningless empty implementation
The interface is too small -- it needs more methods
setMicrosteps should be protected instead of public

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