Item 3:Never treat arrays polymorphically.(More Effective C++)

时间：2011-06-07 来源：Ray Z

1 #include <iostream>
2
3 using namespace std;
4
5 class BST
6 {
7 private:
8     int a;
9
10 public:
11     BST(int n) : a(n){};
12     int getData() { return a; }
13     friend ostream& operator<<(ostream &os, BST &bst);
14 };
15
16 ostream& operator<<(ostream &os, BST &bst)
17 {
18     cout <<  bst.getData();
19     return os;
20 }
21
22 class BalancedBST : public BST
23 {
24 private:
25     int number;
26
27 public:
28     BalancedBST(int n1, int n2) : BST(n1), number(n2){}
29 };
30
31 void print(BST b[], int count)
32 {
33     for(int i=0; i<count; i++)
34     {
35         cout << b[i] << endl;
36     }
37 }
38
39 int main()
40 {
41     BalancedBST bb1(1,3);
42     BalancedBST bb2(2,4);
43     BalancedBST a[2] = {bb1, bb2};
44     BST b[2] = {bb1, bb2};
45     print(a, 2);
46     print(b, 2);
47
48     cin.get();
49     return 0;
50 }

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