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assert(3) [osx man page]

ASSERT(3)						   BSD Library Functions Manual 						 ASSERT(3)

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 abort(3) function is called, effectively terminating the program. If expression is true, the assert() macro does nothing. The assert() macro may be removed at compile time with the cc(1) option -DNDEBUG. DIAGNOSTICS
The following diagnostic message is written to stderr if expression is false: "assertion "%s" failed: file "%s", line %d ", "expression", __FILE__, __LINE__); SEE ALSO
cc(1), abort(3) STANDARDS
The assert() macro conforms to ANSI X3.159-1989 (``ANSI C89''). HISTORY
A assert macro appeared in Version 6 AT&T UNIX. BSD
June 9, 1993 BSD

Check Out this Related Man Page

assert(3)						     Library Functions Manual							 assert(3)

assert - Inserts program diagnostics LIBRARY
Standard C Library (libc.a, SYNOPSIS
#include <assert.h> void assert( int expression) ; STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: assert(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies an expression that is evaluated as TRUE or FALSE. This expression is evaluated in the same manner as a C language if control statement. DESCRIPTION
The assert() macro inserts diagnostics into programs. On execution, when the expression parameter is false (returns FALSE), this macro writes information about the particular call that failed, including the text of the argument, the name of the source file, and the source- file line number (the latter two are respectively the values of preprocessing macros __FILE__ and __LINE__) on stderr. The error message is taken from the standard C library message catalog. The assert() macro then calls the abort() function to (normally) terminate the process. When you compile a program with the -DNDEBUG preprocessor option, or with the #define NDEBUG preprocessor control statement before the #include <assert.h> statement, calls to the assert() macro have no effect. RETURN VALUES
The assert() function returns no value. RELATED INFORMATION
Routines: abort(3) Standards: standards(5) delim off assert(3)
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