On 2013-03-15 16:43, H Hartley Sweeten wrote:
I guess the real question is, what's the underlying type of a bool? It must be an unsigned "something" or the compiler would complain. And does assigning a bit field to the bool actually save any space? <linux/types.h> typedef _Bool bool; _Bool is a standard type in C99 I found this: http://gcc.gnu.org/ml/gcc-patches/2000-10/msg01127.html But honestly still don't know what a _Bool is... :-)
It's a special unsigned integer type. Converting any scalar value to _Bool should produce 0 or 1 (false or true). Assigning a scalar value to a _Bool involves such a conversion so the value 0 or 1 should be stored no matter what try and store in there. _Bool bit-fields aren't the same as the _Bool type though, and the standard only says what shall happen if you store the value 0 or 1 in there and doesn't say what happens if you store a different value in there.
Search for n869.pdf if interested. That's only a draft of the C99 standard, but is the closest you'll find to the actual standard without shelling out the dosh for the actual standard.
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