On Fri, 9 Aug 2019 at 21:32, Jonny Grant wrote: > > Hi > Looks like the bool can't be converted to size_t Of course it can. You're using options which enable some noisy warnings and then turn those warnings into errors. But your example doesn't try to conbert bool to size_t anyway, it performs arithmetic on bools, which produces an int, then tries to convert that to size_t. Obviously converting int to size_t changes from signed to unsigned, and that's why you get a -Wsign-conversion diagnostic. Questionable code (like performing arithmetic on bool values) will often trigger noisy warnings that have many false positives. There's a reason -Wsign-conversion isn't included in -Wall or -Wextra. It's easy to avoid the warning if you really need to perform arithmetic on bool: size_t i = size_t(a + b); or: size_t i = size_t(a) + b;
