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ASSERT(3)                  Linux Programmer's Manual                 ASSERT(3)

       assert - abort the program if assertion is false

       #include <assert.h>

       void assert(scalar expression);

       If  the  macro  NDEBUG  was  defined  at the moment <assert.h> was last
       included, the macro assert() generates no code, and hence does  nothing
       at all.  Otherwise, the macro assert() prints an error message to stan-
       dard error and terminates the program by calling abort(3) if expression
       is false (i.e., compares equal to zero).

       The  purpose  of  this  macro is to help programmers find bugs in their
       programs.  The  message  "assertion  failed  in  file  foo.c,  function
       do_bar(), line 1287" is of no help at all to a user.

       No value is returned.

       POSIX.1-2001,  C89,  C99.  In C89, expression is required to be of type
       int and undefined behavior results if it is not, but in C99 it may have
       any scalar type.

       assert()  is implemented as a macro; if the expression tested has side-
       effects, program behavior will be different depending on whether NDEBUG
       is defined.  This may create Heisenbugs which go away when debugging is
       turned on.

       abort(3), assert_perror(3), exit(3)

       This page is part of release 3.74 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at

GNU                               2013-09-26                         ASSERT(3)

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