stdbool.h0p
Boolean type and values
Usage
#include <stdbool.h>
Prolog
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
Overview
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 POSIX.1‐2017 defers to the ISO C standard.
The <stdbool.h> header shall define the following macros:
bool
|
Expands to |
|---|---|
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 removed in a future version.