Is there a way of causing a compile error if trying to assign a negative number to an unsigned container?

Question

Is there a way of guarding against the resulting binary from the code in this question? Ideally by way of an error at compile time. Example code from the question:

unsigned int nVal = 0;
nVal = -5;  // no error!

Answer 1

If you are using g++, the switch -Wsign-conversion will warn about the conversion, and -Werror will make that warning an error.