ASSERT(3) BSD Library Functions Manual ASSERT(3)NAME
assert -- expression verification macro
SYNOPSIS
#include <assert.h>
assert(expression);
DESCRIPTION
The assert() macro tests the given expression and if it is false, the calling process is terminated. A diagnostic message is written to
stderr and the function abort(3) is called, effectively terminating the program.
If expression is true, the assert() macro does nothing.
The assert() macro may be removed at compile time by defining NDEBUG as a macro (e.g., by using the cc(1) option -DNDEBUG).
EXAMPLES
The assertion:
assert(1 == 0);
generates a diagnostic message similar to the following:
Assertion failed: (1 == 0), function main, file assertion.c, line 100.
SEE ALSO abort(3)STANDARDS
The assert() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').
HISTORY
An assert macro appeared in Version 6 AT&T UNIX.
BSD January 26, 1999 BSD
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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 output and terminates the program by calling abort() if expression
is false (i.e., compares equal to zero).
The purpose of this macro is to help the programmer find bugs in his program. 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
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 Heisenbugs which go away when debugging is turned on.
SEE ALSO exit(3), abort(3), assert_perror(3)C99 2002-08-25 ASSERT(3)
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