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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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