What is an abstract class?

Question

Bryan · Accepted Answer

Abstract Base Class ("ABC")

Any class where a) cannot be instantiated and b) is comprised of pure virtual functions.

class transport {
   public:
        virtual void turnLeft() == 0;
        virtual void turnRight() == 0;
};

class car :: public transport
{
       public:
           void turnRight() { printf("Wheel right.
");
           void turnLeft() { printf("Wheel left.
");
};

class boat : public transport
{
      public:
          void turnRight() { printf("Rudder right.
"); }
          void turnLeft() { printf("Rudder left.
"); }
}

etc...

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