Effective C++ Placement new 

 1 #include <iostream>
 2 #include <cstdlib>
 3 
 4 using namespace std;
 5 
 6 class Card {
 7     private:
 8         int m_SerialNumber;
 9     public:
10         Card(int id) : m_SerialNumber(id) {}
11         ~Card() {cout<<"~Card"<<endl;}
12         void print() {cout<<m_SerialNumber<<endl;}
13 };
14 
15 int main() {
16     int num = 10;
17     void *rawMemory = operator new[](num * sizeof(Card));
18     Card *cards = static_cast<Card*>(rawMemory);
19     
20     for (int i=0; i<num; i++) {
21         new(&cards[i]) Card(i+1);
22     }
23     
24     for (int i=0; i<num; i++) {
25         cards[i].print();
26     }
27     
28     for (int i=num-1; i>=0; i--) {
29         cards[i].~Card();
30     }
31     operator delete[](rawMemory);
32     system("pause");
33     return 0;
34 }

这么奇葩的操作。

 operator delete[] 只能对由对应 operator new[] 得到的空间指针变量操作，不能直接对cards指针使用

posted @ 2014-04-10 22:27  卖程序的小歪  阅读(138)  评论(0)  编辑  收藏  举报