【51】编写new和delete时需固守常规

 1     void* operator new (std::size_t size) throw()
 2     {
 3         if(size=0)
 4         {
 5             size =1;
 6         }
 7         while (true)
 8         {
 9             if(分配成功)
10             {
11                 return(一个指针，指向分配而来的内存);
12             }
13             new_hanlder global_handler = set_new_handler(0);
14             set_new_handler(global_handler);
15             if(global_handler)
16             {
17                 (*global_handler)();
18             }
19             else
20             {
21                 throw std::bad_alloc();
22             }
23         }
24     }