On Fri, Jan 25, 2002 at 04:07:50PM +0100, Werner Almesberger wrote:
> H. Peter Anvin wrote:
> > c) The ability to cast to bool and get an unambiguous true or false:
> >
> > b = (bool)a;
> >
> > This replaces the idiomatic but occationally confusing
> >
> > b = !!a;
>
> Careful, though. This example
>
> #include <stdbool.h>
> #include <stdio.h>
>
> int main(void)
> {
> int foo;
>
> foo = (bool) 4;
> printf("%d\n",foo);
> return 0;
> }
>
> e.g. compiled with gcc "2.96" (RH 7.1, 2.96-85), yields 4.
Yeah, _Bool builtin type was added to gcc 2000-11-13, ie. after 2.96-RH was
branched. It yields 1 in gcc 3.0 or 3.1 CVS though.
Jakub
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This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:00:32 EST