【C++ Primer | 19】控制内存分配

重载new和delete

1. 测试代码：

 1 #include<iostream>
 2 #include<new>
 3 using namespace std;
 4 class A {
 5 public:
 6     A() { cout << "A constructor" << endl; }
 7 
 8     void* operator new(size_t size) 
 9     {
10         cout << "this is A's new" << endl;
11         return ::operator new(size);
12     }
13 
14     void operator delete(void* ptr) 
15     {
16         cout << "this is A's delete" << endl;
17         return ::operator delete(ptr);
18     }
19 
20     ~A() {  cout << "A destructor" << endl; }
21 };
22 
23 int main()
24 {
25     A *a = new A;
26     delete a;
27     return 0;
28 }

View Code