POSITION的值究竟是什么？它会随着元素在链表内的位置的变化而变化么？
查看mfc源码发现，POSITION是一个结构体指针；既然是指针，那么它的值是不会随着元素在链表内位置的变化而变化的，而链表中元素的index则会变化。
delete 一个指针之后，要将该指针赋值为NULL。否则，如果该指针所指向的内容已经被其他程序所使用，再次delete这个指针，就会造成错误。
赋值为NULL也表示该指针未被使用，如果使用它之前没有使它指向某处空间 ，编译器会报错。
delete,
mfc,
null,
position,
指针
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