c++--重载关键字-new、delete、＜＜_c++ 重载delete

• 可以重载的运算符

• 用法

返回类型+operator+运算符+(形参)+{操作}

eg：void* operator new(size_t size){操作}

#define  _CRT_SECURE_NO_WARNINGS
using namespace std;
#include<stdio.h>
#include<stdlib.h>
#include<iostream>
 
class A
{
public:
    A(int i = 0) :m_i(5) { cout << "A" << endl; }//A的构造函数
    friend ostream& operator<<(ostream& os, A& a);//<<的重载
    void* operator new(size_t size)//new的重载
    {
        cout << "new" << endl;
        return malloc(size);
    }
    void operator delete(void * p)//delete的重载
    {
        cout << "delete" << endl;
        return free(p);
    }
private:
    int m_i;
};
ostream& operator<<(ostream& os, A& a)//<<的重载
{
    os << a.m_i;
    return os;
}
void main()
{
    A a;
    cout << a << endl; //<<(cout,a)
    A* p = new A(7);
    delete p;
}

执行结果