29.局部和全局重载new delete

Posted 2020-10-27 喵小喵~

 1 #include <iostream>
 2 #include <Windows.h>
 3 using namespace std;
 4 
 5 //全局内存管理,统计释放内存,分配内存
 6 
 7 //重载全局的new
 8 void *operator new(size_t size)
 9 {
10     cout << "g_new call" << endl;
11     void *p = malloc(size);
12     return p;
13 }
14 
15 //重载全局的delete
16 void operator delete(void *p)
17 {
18     cout << "g_delete call" << endl;
19     free(p);
20 }
21 
22 //重载全局的new[]
23 void *operator new [](size_t size)
24 {
25     cout << size << endl;
26     cout << "g_new call []" << endl;
27     return operator new(size);//每个元素调用一次new
28 }
29 
30 //重载全局的delete
31 void operator delete [](void *p)
32 {
33     cout << "g_delete [] call" << endl;
34     free(p);
35 }
36 
37 class myclass
38 {
39 public:
40     myclass()
41     {
42         cout << "create call" << endl;
43     }
44     ~myclass()
45     {
46         cout << "delete call" << endl;
47     }
48     //局部重载new
49     static void * operator new(size_t size)
50     {
51         cout << "new call" << endl;
52         return malloc(size);
53     }
54     //局重载delete
55     static void operator delete(void *p)
56     {
57         ::delete p;
58     }
59 };
60 
61 void main()
62 {
63     //int *p = new int[3]{ 1,2,3 };
64     //cout << p[1] << endl;
65 
66     //myclass *p = new myclass;
67     //delete p;
68 
69     //int *pint = new int[10];
70     myclass *p1 = new myclass;
71     //delete p1;
72 
73     cin.get();
74 }