在删除之前是否有任何理由检查NULL指针？ [英] Is there any reason to check for a NULL pointer before deleting?

问题描述

在删除指针之前，我常常会看到 NULL 的旧代码检查，类似于

I often see legacy code checking for NULL before deleting a pointer, similar to,

if (NULL != pSomeObject) 
{
    delete pSomeObject;
    pSomeObject = NULL;
}

有任何理由检查 / code>指针之前删除它？

Is there any reason to checking for a NULL pointer before deleting it? What is the reason for setting the pointer to NULL afterwards?

推荐答案

是什么原因将指针设置为 NULL 删除空指针是完全安全的;它实际上相当于没有操作。

It's perfectly "safe" to delete a null pointer; it effectively amounts to a no-op.

在删除之前，您可能想要检查null的原因是试图删除一个空指针可能表示您的程序中的一个错误。

The reason you might want to check for null before you delete is that trying to delete a null pointer could indicate a bug in your program.

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