NAME
stdbool.h —
boolean type and values
SYNOPSIS
#include
<stdbool.h>
DESCRIPTION
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.
The <stdbool.h> header shall define the following macros:
- bool
- Expands to _Bool .
- true
- Expands to the integer constant 1.
- false
- Expands to the integer constant 0.
- __bool_true_false_are_defined
- Expands to the integer constant 1.
An application may undefine and then possibly redefine the macros bool, true, and false.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature and may be withdrawn in a future version.
SEE ALSO
None.
CHANGE HISTORY
First released in Issue 6. Included for alignment with the ISO/IEC 9899:1999 (“ISO C99”) standard.
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