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LISTING 14.3 PREFIX AND POSTFIX OPERATORS |
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1: // Listing 14.3
2: // Returning the dereferenced this pointer
3:
4: #include <iostream.h>
5:
6: class Counter
7: {
8: public:
9: Counter();
10: ~Counter(){}
11: int GetItsVal()const { return itsVal; }
12: void SetItsVal(int x) {itsVal = x; }
13: const Counter& operator++ (); // prefix
14: const Counter operator++ (int); // postfix
15:
16: private:
17: int itsVal;
18: };
19:
20: Counter::Counter():
21: itsVal(0)
22: {}
23:
24: const Counter& Counter::operator++()
25: {
26: ++itsVal;
27: return *this;
28: }
29:
30: const Counter Counter::operator++(int)
31: {
32: Counter temp(*this);
33: ++itsVal;
34: return temp;
35: }
36:
37: int main()
38: {
39: Counter i;
40: cout << The value of i is << i.GetItsVal() << endl;
41: i++;
42: cout << The value of i is << i.GetItsVal() << endl;
43: ++i;
44: cout << The value of i is << i.GetItsVal() << endl;
45: Counter a = ++i;
46: cout << The value of a: << a.GetItsVal(); |
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continues |
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