null pointer

If a pointer pointing to an object not in the graph, then the object is not a reachable object, and then garbage collector sets the slot to null in the short weak reference table.

如果一个指针指向一个不在图中的对象，那么此对象就是一个不可到达的对象，垃圾收集器就将短弱引用表相应的槽置空。

In other words, null pointer values convey the notion of inexistent objects.

换句话说, 空指针值表达的意思是不存在的对象.

The null pointer into the target type of a null pointer.

把空指针转换成目标类型的空指针.

Null pointer might not compare equal with a variable that has the value 0.

这一句是说空指针不同于“值为0的变量”,因为数值上虽相同,但类型不同,我是这么理解的.

Null pointer always compares equal to the constant zero.

空指针不同与任何类型指针,空指针同于“值为0的常量”,空指针不同于“值为0的变量”.

If mem block is NULL, pointer is ignored and free immediately returns.

如果NULL内存块,操作将被忽略并且函数立即返回.

A null reference pointer was passed to the stub.

向占位程序传送了空的索引指针.

If the argument is a null pointer, all open files are flushed.

如果函数的参数是空, 将导致所有的文件被刷新,并且文件的开启属性不变.