C++之new和delete运算符重载

• 通过new创建该类的对象时，将首先调用该操作符函数分配内存(可重载)，然后再调用该类的构造函数
• 通过delete销毁该类的对象时，将首先调用该类的析构函数，然后再调用该操作符函数释放内存（可重载）

#include <iostream>
#include <cstdlib>
using namespace std;
class A{
public:
    A(void){
        cout << "A construct" << endl;
    }
    ~A(void){
        cout << "~A disconstruct" << endl;
    }
    void * operator new(size_t size){
        cout << "A new" << endl;
    return malloc(size);
    }
    void operator delete(void *p){
        cout << "A delete" << endl;
        free(p);
    }
};
int main(void){
    A *p = new A;
    delete p;
    return 0;
}