assert.h(0P)		   POSIX Programmer's Manual		  assert.h(0P)

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.

NAME
       assert.h — verify program assertion

SYNOPSIS
       #include <assert.h>

DESCRIPTION
       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 <assert.h> header shall define the assert() macro. It refers to the
       macro NDEBUG which is not defined in the header. If NDEBUG is defined
       as a macro name before the inclusion of this header, the assert() macro
       shall be defined simply as:


	   #define assert(ignore)((void) 0)

       Otherwise, the macro behaves as described in assert().

       The assert() macro shall be redefined according to the current state of
       NDEBUG each time <assert.h> is included.

       The assert() macro shall be implemented as a macro, not as a function.
       If the macro definition is suppressed in order to access an actual
       function, the behavior is undefined.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of POSIX.1‐2017, assert()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2017			  assert.h(0P)