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 = 10;
    void *rawMemory = operator new[](num * sizeof(Card));
    Card *cards = static_cast<Card*>(rawMemory);
    
    for (int i=0; i<num; i++) {
        new(&cards[i]) Card(i+1);
    }
    
    for (int i=0; i<num; i++) {
        cards[i].print();
    }
    
    for (int i=num-1; i>=0; i--) {
        cards[i].~Card();
    }
    operator delete[](rawMemory);
    system("pause");
    return 0;
}

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