如何确定是否释放了缓冲区 [英] How to determine if a buffer is freed or not

问题描述

我使用new来分配缓冲区，如下所示:

I use new to allocate a buffer, as follows:

    BYTE *p;

    p = new BYTE[20];


    ...

    delete p;

删除p后，如果我不为p分配NULL，是否有办法确定它是否已被释放?

After p is deleted, if I do NOT assign NULL to p, is there a way to determine whether it has already been freed?

推荐答案

您无法确定，这是您通常依赖高级机制来处理内存的主要原因之一，例如智能指针( shared_ptr ，未定义行为登陆的程序中令人讨厌的错误.

You cannot determine that, and that's one of the main reasons you usually rely on higher-level mechanisms to handle memory, such as smart pointers (shared_ptr, unique_ptr and so on), or in your case rather std::vector, to deal with raw memory in a way that guarantee no double delete, forgotten delete, or other nasty mistakes that launch your program in undefined behavior land.

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