C++ problematic code piece

Question

We got practice sheets for a test next week, for studying a little bit of C++ (still a beginner here). I still can\'t figure out a simple question.

That is, why are thes

Answer 1

Both snippets pass a reference (or pointer in the second case) to temporary. Consider for example p(18). Where would 18 actually be stored? So where should p(18) point to?

Side note: If everything would be const, the code would be ok, ie.

int const & p(int const & input) { return input; }

The standard would guarantee it.