NAME
assert() — verify program assertion
SYNOPSIS
#include <assert.h>
void assert(int expression);
DESCRIPTION
This macro is useful for putting diagnostics into programs.
When it is executed, if
expression
is false (zero),
assert()
prints:
Assertion failed: expression, file xyz, line nnn
on the standard error output and aborts.
In the error message,
xyz
is the name of the source file and
nnn
the source line number of the
assert()
statement.
Compiling with the preprocessor option
-DNDEBUG
(see
cpp(1)),
or with the preprocessor control statement
#define NDEBUG
ahead of the
#include <assert.h>
statement, stops assertions from being compiled into the program.
APPLICATION USAGE
assert()
is thread-safe.
It
is not async-cancel-safe.
WARNINGS
The expression argument used by
assert()
in compatibility mode
cannot contain string literals or double quotes without escapes.
STANDARDS CONFORMANCE
assert(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1, ANSI C
