NAME

stdbool — standard boolean types

SYNOPSIS

#include <stdbool.h>

DESCRIPTION

The <stdbool.h> header defines four macros:

1. bool, which expands to _Bool;
2. true, which expands to the integer constant 1;
3. false, which expands to the integer constant 0; and
4. __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The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature that may be withdrawn in a future version of a standard.

SEE ALSO

stdint(3)

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.