1assert.h(0P)               POSIX Programmer's Manual              assert.h(0P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       assert.h — verify program assertion
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SYNOPSIS

15       #include <assert.h>
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DESCRIPTION

18       The functionality described on this reference page is aligned with  the
19       ISO C  standard.  Any  conflict between the requirements described here
20       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
21       defers to the ISO C standard.
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23       The <assert.h> header shall define the assert() macro. It refers to the
24       macro NDEBUG which is not defined in the header. If NDEBUG  is  defined
25       as a macro name before the inclusion of this header, the assert() macro
26       shall be defined simply as:
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29           #define assert(ignore)((void) 0)
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31       Otherwise, the macro behaves as described in assert().
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33       The assert() macro shall be redefined according to the current state of
34       NDEBUG each time <assert.h> is included.
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36       The  assert() macro shall be implemented as a macro, not as a function.
37       If the macro definition is suppressed in  order  to  access  an  actual
38       function, the behavior is undefined.
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40       The following sections are informative.
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APPLICATION USAGE

43       None.
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RATIONALE

46       None.
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FUTURE DIRECTIONS

49       None.
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SEE ALSO

52       The System Interfaces volume of POSIX.1‐2017, assert()
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55       Portions  of  this text are reprinted and reproduced in electronic form
56       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
57       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
58       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
59       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
60       event of any discrepancy between this version and the original IEEE and
61       The  Open Group Standard, the original IEEE and The Open Group Standard
62       is the referee document. The original Standard can be  obtained  online
63       at http://www.opengroup.org/unix/online.html .
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65       Any  typographical  or  formatting  errors that appear in this page are
66       most likely to have been introduced during the conversion of the source
67       files  to  man page format. To report such errors, see https://www.ker‐
68       nel.org/doc/man-pages/reporting_bugs.html .
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72IEEE/The Open Group                  2017                         assert.h(0P)
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