查询词典 nil pointer

Internally this just sets compare function pointer to NULL to ensure that

这只是设置内部比较函数指针为NULL，以确保

It's impossible to call a virtual function through a null pointer at runtime because of an uninitialized vtbl.

它不需要用对象指针·它节约了vtbls所需的内存·在运行时不可能发生因为没有初始化vtbl而通过一个空指针调用虚函数。

To ensure that the aName parameter is a pointer, use the macro NS_PRECONDITION to warn if null, follow with a null test in the line below, and return the error result code NS_ERROR_NULL_POINTER.

然后是个判空测试，在指针为空时返回错误码NS_ERROR_NULL_POINTER。

The pointer is not NULL but the object is long gone.

指针不为NULL，但对象已经不存在了。

Each theme has a next pointer, which should either be NULL or point to another theme in t he same file.

usplash 主题库在一个连接的列表里可以容纳多个主题，美国主题有一个 next 指针，它要么为空，要么指向另一个在同一文件中的主题。

Therefore, it is easy to detect the use of a NULL pointer.

因此，很容易去检测NULL指针的使用。

That is usually a null pointer, but it is not guaranteed.

通常是一个空指针，但并不保证总是这样。

First and foremost: it is fine to delete a null pointer.

首先最重要的一点：删除空指标是没有影响的。

What we do is to set that pointer to NULL in the PostNcDestroy.

我们做什么，是集指针 NULL ，在 PostNcDestroy 。

Return 0;} As you can see, what we do here is dereference a NULL pointer.

如你所见，我们在这里做的就是废弃一个NULL指针。

We were supposed to participate in a siege of this unit.

当然我们也参加了围困这支部队的任务。

Sometimes we eat pomelos.

有时我们也会吃柚子。