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@node stdbool.h
@section @file{stdbool.h}
POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/basedefs/stdbool.h.html}
Gnulib module: stdbool
Portability problems fixed by Gnulib:
@itemize
@item
This header file is missing on some platforms:
AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1.
@item
Some compilers have bugs relating to @samp{bool}.
@item
This header file defines @code{true} incorrectly on some platforms:
OpenBSD 4.7 with gcc 2.95.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
@code{<stdbool.h>} must be #included before @samp{_Bool} can be used.
@item
You cannot assume that @code{_Bool} is a typedef; it might be a macro.
@item
Bit-fields of type @samp{bool} are not supported. Portable code
should use @samp{unsigned int foo : 1;} rather than @samp{bool foo : 1;}.
@item
Casts and automatic conversions to @samp{bool} don't test against the
zero value or the null pointer, as they should. Such casts should only
be used if the casted value is known to be equal to 0 or 1.
@item
You cannot assume that casting a floating point literal to @samp{bool} will
result in a constant expression.
@end itemize
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