STDBOOL(3) |
Library Functions Manual |
STDBOOL(3) |
NAME
stdbool — standard boolean types
DESCRIPTION
The
<stdbool.h> header defines four macros:
-
bool, which expands to _Bool;
-
true, which expands to the integer constant 1;
-
false, which expands to the integer constant 0; and
-
__bool_true_false_are_defined, which expands to the constant 1.
The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature that may be withdrawn in a future version of a standard.
STANDARDS
The
<stdbool.h> header conforms to ISO/IEC 9899:1999 (“ISO C99”) and IEEE Std 1003.1-2001 (“POSIX.1”).
HISTORY
The
<stdbool.h> header was first introduced in
NetBSD 1.6.