Out parameters and pass by reference [closed]

Answer 1

It seems to me that the proper use of const would (mostly) eliminate the need for that tip. The part that still seems useful is when reading caller code, seeing:

Func1(x);

it isn't quite clear what is being done with x (particularly with a nondescript name like Func1). Instead using:

Func2(&x);

with the above convention, indicates to the caller that they should expect x to be modified.