The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2003 Edition
Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.

NAME

stdbool.h - boolean type and values

SYNOPSIS

#include <stdbool.h>

DESCRIPTION

[CX] [Option Start] 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 defers to the ISO C standard. [Option End]

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.

The following sections are informative.

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The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature and may be withdrawn in a future version.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 standard.

End of informative text.
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