Effective C++ Placement new

 #include <iostream>
 #include <cstdlib>

 using namespace std;

 class Card {
     private:
         int m_SerialNumber;
     public:
         Card(int id) : m_SerialNumber(id) {}
         ~Card() {cout<<"~Card"<<endl;}
         void print() {cout<<m_SerialNumber<<endl;}
 };

 int main() {
     int num = ;
     void *rawMemory = operator new[](num * sizeof(Card));
     Card *cards = static_cast<Card*>(rawMemory);

     for (int i=; i<num; i++) {
         new(&cards[i]) Card(i+);
     }

     for (int i=; i<num; i++) {
         cards[i].print();
     }

     for (int i=num-; i>=; i--) {
         cards[i].~Card();
     }
     operator delete[](rawMemory);
     system("pause");
     return ;
 }

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