C++ How to check that a function is receiving an unsigned int?

Question

I have a function declared as:

void foo(unsigned int x)

How can I check that foo() is not receiving negative numbers? I'd like that if I call foo(-1) an exception is thrown, but of course since x is converted automatically to unsigned, I can't check for its positivity like:

if not(x>=0){ do_something();};

or similar checks.

Answer 1

There is not really any good way to do it, but you can do it with some tricks:

1) declare an undefined better match:

void foo(unsigned int x) {
  //do something
}

void foo(int x);

2) use typeid to determine the type.