assert man page on Cygwin

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ASSERT(3)			    NEWLIB			     ASSERT(3)

NAME
       2.5 `assert'--macro for debugging diagnostics

SYNOPSIS
	    #include <assert.h>
	    void assert(int EXPRESSION);

DESCRIPTION
       Use  this  macro to embed debuggging diagnostic statements in your pro‐
       grams.  The argument EXPRESSION should be an expression which evaluates
       to true (nonzero) when your program is working as you intended.

	  When	EXPRESSION  evaluates to false (zero), `assert' calls `abort',
       after first printing a message showing what failed and where:

	     Assertion failed: EXPRESSION, file FILENAME, line	LINENO,	 func‐
       tion: FUNC

	  If  the name of the current function is not known (for example, when
       using a C89 compiler that does not understand __func__),	 the  function
       location is omitted.

	  The  macro is defined to permit you to turn off all uses of `assert'
       at compile time by defining `NDEBUG' as a preprocessor  variable.    If
       you do this, the `assert' macro expands to

	     (void(0))

RETURNS
       `assert' does not return a value.

PORTABILITY
       The  `assert'  macro is required by ANSI, as is the behavior when `NDE‐
       BUG' is defined.

	  Supporting OS	 subroutines  required	(only  if  enabled):  `close',
       `fstat', `getpid', `isatty', `kill', `lseek', `read', `sbrk', `write'.

SEE ALSO
       assert  is  part	 of  the library.  The full documentation for is main‐
       tained as a Texinfo manual.  If info and are properly installed at your
       site, the command

	      info

       will give you access to the complete manual.

NEWLIB				  April 2010			     ASSERT(3)
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