重载新/删除 [英] overloading new/delete

问题描述

我在我的程序中创建一个小的内存泄漏查找程序，但
我的方式重载新和删除（以及新的[]和删除[]）
似乎没有做任何事情。

I'm making a little memory leak finder in my program, but my way of overloading new and delete (and also new[] and delete[]) doesn't seem to do anything.

void* operator new (unsigned int size, const char* filename, int line)
{
    void* ptr = new void[size];
    memleakfinder.AddTrack(ptr,size,filename,line);
    return ptr;
}

我重载的方式 new 显示在上面的代码段中。我想这是运算符返回void *的东西，但我不知道该怎么做。

The way i overloaded new is shown in the code snippet above. I guess it's something with the operator returning void* but i do not know what to do about it.

推荐答案

void* ptr = new void[size];

不能这样做。修复它。

从不尝试全局重载新的/删除。可以将它们放在基类中，并从此类派生所有对象，或者使用命名空间或模板分配器参数。为什么，你可能会问。因为如果你的程序不止一个文件，并使用STL或其他库，你会拧紧。

Never ever try to overload new/delete globally. Either have them in a base class and derive all your objects from this class or use a namespace or a template allocator parameter. Why, you may ask. Because in case your program is more than a single file and using STL or other libraries you are going to screw up.

这是一个精简版的来自VS2005的新运算符 new.cpp ：

Here's a distilled version of new operator from VS2005 new.cpp:

void * operator new(size_t size) _THROW1(_STD bad_alloc)
{       // try to allocate size bytes
   void *p;
   while ((p = malloc(size)) == 0)
    if (_callnewh(size) == 0)
     {       // report no memory
        static const std::bad_alloc nomem;
        _RAISE(nomem);
     }

     return (p);
}

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