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Why use pointers?
Passing a modifiable parameter to c++ function
Why would I want to have pointer parameters? The only reason I can see is for small functions to attempt to reduce confusion and a smaller memory footprint.
In Passing a modifiable parameter to c++ function I answered when to use a reference instead of a pointer.
Conversely, prefer a pointer to a reference when any of the following are true:
Some people also prefer a pointer when the thing that’s being pointed at should be mutated, saying that the difference between a const reference and a non-const reference isn’t obvious enough to the reader.