| assert(3) - phpMan
ASSERT(3) Linux Programmer's Manual ASSERT(3)
NAME
assert - abort the program if assertion is false
SYNOPSIS
#include <assert.h>
void assert(scalar expression);
DESCRIPTION
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 standard 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.
RETURN VALUE
No value is returned.
CONFORMING TO
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.
BUGS
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.
SEE ALSO
abort(3), assert_perror(3), exit(3)
COLOPHON
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 http://www.kernel.org/doc/man-pages/.
GNU 2013-09-26 ASSERT(3)
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