如果您需要修改指针而不是指针指向的对象，您可能希望通过引用传递指针.

You would want to pass a pointer by reference if you have a need to modify the pointer rather than the object that the pointer is pointing to.

这类似于为什么使用双指针；使用对指针的引用比使用指针稍微安全一些.

This is similar to why double pointers are used; using a reference to a pointer is slightly safer than using pointers.