169. Encapsulation

Question.6

A Timer class internally switches from a software-based counter to a hardware-based register without altering its public interface.

Version 1 (software timer):

class Timer {
   int counter;
public:
   int getTime() const { return counter; }
};

Version 2 (hardware timer):

class Timer {
   volatile uint32_t* hw_reg;
public:
   int getTime() const { return *hw_reg; }
};

Does the user code need to change?

Need Help? Refer to the Quick Guide below

Select Answer