ASSERT(P) POSIX Programmer's Manual ASSERT(P)
assert - insert program diagnostics
void assert(scalar expression);
The assert() macro shall insert diagnostics into programs; it shall expand to a void
expression. When it is executed, if expression (which shall have a scalar type) is false
(that is, compares equal to 0), assert() shall write information about the particular call
that failed on stderr and shall call abort().
The information written about the call that failed shall include the text of the argument,
the name of the source file, the source file line number, and the name of the enclosing
function; the latter are, respectively, the values of the preprocessing macros __FILE__
and __LINE__ and of the identifier __func__.
Forcing a definition of the name NDEBUG, either from the compiler command line or with the
preprocessor control statement #define NDEBUG ahead of the #include <assert.h> statement,
shall stop assertions from being compiled into the program.
The assert() macro shall not return a value.
No errors are defined.
The following sections are informative.
abort() , stderr, the Base Definitions volume of IEEE Std 1003.1-2001, <assert.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ASSERT(P)