list1018.cpp

teach yourself C++ in 21 days 第五版

// Listing 10.18 - Conversion Operators
#include <iostream>

class Counter
{
  public:
    Counter();
    Counter(int val);
    ~Counter(){}
    int GetItsVal()const { return itsVal; }
    void SetItsVal(int x) {itsVal = x; }
    operator unsigned int();
  private:
    int itsVal;
};

Counter::Counter():
itsVal(0)
{}

Counter::Counter(int val):
itsVal(val)
{}

Counter::operator unsigned int ()
{
   return ( int (itsVal) );
}

int main()
{
   Counter ctr(5);
   int theInt = ctr;
   std::cout << "theInt: " << theInt << std::endl;
   return 0;
}