View Source: assert(3) - Waikato Linux Users Group

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!!NAME

assert - Abort the program if assertion is false.

!!SYNOPSIS

 #include <assert.h>
 void assert (int ''expression'');

!!DESCRIPTION

__assert()__ prints an error message to standard output and terminates the program by calling __abort()__ if __expression__ is false (i.e., compares equal to zero). This only happens when the macro __NDEBUG__ was undefined when <assert.h> was last included.

!!RETURN VALUE

No value is returned.

!!CONFORMING TO

ISO9899 (ANSI C). In the 1990 standard, __expression__ is required to be of type __int__ and undefined behavior results if it is not, but in the 1999 standard it may have any scalar type.

!!BUGS

__assert()__ is implemented as a macro; if the expression tested has side-effects, program behaviour will be different depending on whether __NDEBUG__ is defined. This may create [HeisenBug]s which go away when debugging is turned on.

!!SEE ALSO

exit(3), abort(3)

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Last edited on Wednesday, March 24, 2004 11:53:53 pm by AristotlePagaltzis

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