The importance of declaring a variable as unsigned

Question

Is it important to declare a variable as unsigned if you know it should never be negative? Does it help prevent anything other than negative numbers being fed into a function th

Answer 1

It doesn't prevent people misusing your interface, but at least they should get a warning unless they add a C-style cast or static_cast to make it go away (in which case you cannot help them further).

Yes, there is value in this as it properly expresses the semantics you wish.