Reason to Pass a Pointer by Reference in C++?

Question

Under which circumstances would you want to use code of this nature in c++?

void foo(type *&in) {...}  void fii() {   type *choochoo;   ...   foo(choochoo); } 

Answer 1

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.

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