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        assert.h - verify program assertion


        #include <assert.h>


        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 IEEE Std 1003.1-2001, assert()


        Portions  of  this text are reprinted and reproduced in electronic form
        from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
        --  Portable  Operating  System  Interface (POSIX), The Open Group Base
        Specifications Issue 6, Copyright (C) 2001-2003  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
http://www.opengroup.org/unix/online.html .


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