29.局部和全局重载new delete

#include <iostream>
#include <Windows.h>
using namespace std;

//全局内存管理,统计释放内存,分配内存

//重载全局的new
void *operator new(size_t size)
{
    cout << "g_new call" << endl;
    void *p = malloc(size);
    return p;
}

//重载全局的delete
void operator delete(void *p)
{
    cout << "g_delete call" << endl;
    free(p);
}

//重载全局的new[]
void *operator new [](size_t size)
{
    cout << size << endl;
    cout << "g_new call []" << endl;
    return operator new(size);//每个元素调用一次new
}

//重载全局的delete
void operator delete [](void *p)
{
    cout << "g_delete [] call" << endl;
    free(p);
}

class myclass
{
public:
    myclass()
    {
        cout << "create call" << endl;
    }
    ~myclass()
    {
        cout << "delete call" << endl;
    }
    //局部重载new
    static void * operator new(size_t size)
    {
        cout << "new call" << endl;
        return malloc(size);
    }
    //局重载delete
    static void operator delete(void *p)
    {
        ::delete p;
    }
};

void main()
{
    //int *p = new int[3]{ 1,2,3 };
    //cout << p[1] << endl;

    //myclass *p = new myclass;
    //delete p;

    //int *pint = new int[10];
    myclass *p1 = new myclass;
    //delete p1;

    cin.get();
}