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assert(3) [bsd man page]

ASSERT(3)						     Library Functions Manual							 ASSERT(3)

assert - program verification SYNOPSIS
#include <assert.h> assert(expression) DESCRIPTION
Assert is a macro that indicates expression is expected to be true at this point in the program. It causes an exit(2) with a diagnostic comment on the standard output when expression is false (0). Compiling with the cc(1) option -DNDEBUG effectively deletes assert from the program. DIAGNOSTICS
`Assertion failed: file f line n.' F is the source file and n the source line number of the assert statement. 7th Edition May 12, 1986 ASSERT(3)

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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, consisting of the text of the expression, the name of the source file, the line number and the enclosing function, is written to stderr and the abort(3) func- tion 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, function "%s" ", "expression", __FILE__, __LINE__, __func__); SEE ALSO
cc(1), _DIAGASSERT(3), abort(3) STANDARDS
The assert() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
A assert macro appeared in Version 6 AT&T UNIX. Information on the name of the enclosing function appeared in ISO/IEC 9899:1999 (``ISO C99''). BSD
January 22, 2007 BSD
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