The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### 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 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.

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 The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature and may be withdrawn in a future version.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