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       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.


       assert.h — verify program assertion


       #include <assert.h>


       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.1‐2008 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.








       The System Interfaces volume of POSIX.1‐2008, assert()


       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2013 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX),  The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical  Corrigendum  1  applied.)  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 .

       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 .