On 27/08/2019 13:42, Jonathan Wakely wrote:
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;
I see. I had been expected the bool to be treated as an unsigned number,
as it can never be negative. It can never be anything other than zero or
one. That's a language issue though I recall, someone shared a quote
from the spec.
Jonny
