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();
 }