1assert.h(0P) POSIX Programmer's Manual assert.h(0P)
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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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12 assert.h — verify program assertion
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15 #include <assert.h>
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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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43 None.
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46 None.
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49 None.
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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)