Item 6:Distinguish between prefix and postfix forms of increment and decrement o

时间：2011-06-10 来源：Ray Z

1 #include <iostream>
2 using namespace std;
3
4 class MyInt
5 {
6 private:
7     int a;
8 public:
9     MyInt(int n) : a(n){};
10
11     MyInt& operator++()
12     {
13         a += 1;
14         return *this;
15     };
16
17     const MyInt operator++(int)
18     {
19         MyInt old = *this;
20         ++(*this);
21
22         return old;
23     };
24
25     int getValue()
26     {
27         return a;
28     }
29 };
30
31 int main()
32 {
33     MyInt i(4);
34
35     MyInt j = i++;
36     cout << j.getValue() << endl;
37     cout << (++i).getValue() << endl;
38
39     cin.get();
40 }

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