Inheritance with Counter class - C++ Class

C++ examples for Class:Inheritance

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Description

Inheritance with Counter class

Demo Code

#include <iostream>
using namespace std;
class Counter                            //base class
{
protected:                            //NOTE: not private
  unsigned int count;                //count
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  Counter() : count(0)               //no-arg constructor
  {  }
  Counter(int c) : count(c)          //1-arg constructor
  {  }
  unsigned int get_count() const     //return count
  {
    return count;
  }
  Counter operator ++ ()             //incr count (prefix)
  {
    return Counter(++count);
  }
};
class CountDn : public Counter
{
public:
  Counter operator -- ()             //decr count (prefix)
  {
    return Counter(--count);
  }
};
int main()
{
  CountDn c1;                           //c1 of class CountDn
  cout << "\nc1=" << c1.get_count();
  ++c1; ++c1; ++c1;                     //increment c1, 3 times
  cout << "\nc1=" << c1.get_count();
  --c1; --c1;                           //decrement c1, twice
  cout << "\nc1=" << c1.get_count();
  cout << endl;
  return 0;
}

Result


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