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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 .