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From: shopiro@alice.UUCP
Newsgroups: comp.lang.c
Subject: Re: Function prototypes versus open()
Message-ID: <7046@alice.UUCP>
Date: Wed, 1-Jul-87 16:41:20 EDT
Article-I.D.: alice.7046
Posted: Wed Jul  1 16:41:20 1987
Date-Received: Fri, 3-Jul-87 04:24:19 EDT
References: <18346@ucbvax.BERKELEY.EDU> <8042@utzoo.UUCP> <2210@hoptoad.uucp> <657@haddock.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill NJ
Lines: 12
Summary: C++ function prototype with default argument solves the problem

I'd just like to mention that in C++, the prototype for open() would be

	int	open(const char* path, int flags, int mode=0);

This declares a function with three arguments, that can optionally
be called with only two arguments.  In that case, the compiler adds
the third argument using the default value given in the declaration.
Thus old code coexists with new, and type checking is not defeated.
-- 
		Jonathan Shopiro
		AT&T Bell Laboratories, Murray Hill, NJ  07974
		research!shopiro   (201) 582-4179