Date: Tue, 09 Nov 2004 09:58:30 +0100 From: des@des.no (=?iso-8859-1?q?Dag-Erling_Sm=F8rgrav?=) To: Yuval Levy <freebsd-current@sfina.com> Cc: Andre Oppermann <andre@freebsd.org> Subject: Re: FreeBSD 6.0 and onwards Message-ID: <xzpsm7j5rgp.fsf@dwp.des.no> In-Reply-To: <JDEKJNLCGHFCNEBPGLHBMENHFDAA.freebsd-current@sfina.com> (Yuval Levy's message of "Tue, 09 Nov 2004 00:36:40 -0500") References: <JDEKJNLCGHFCNEBPGLHBMENHFDAA.freebsd-current@sfina.com>
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Yuval Levy <freebsd-current@sfina.com> writes: > A currency converter function is part of a web based application plattfor= m: > converted_amount =3D conversion (original_amount, original_currency, > converted_currency). Then we realized we might also need to format the > conversion for display. Introduce a fourth argument, a bolean > (format/non-format). The new function was converted_amount =3D conversion > (original_amount, original_currency, converted_currency, format). By test= ing > if the fourth argument exists and defaulting to the original behaviour if= it > does not we upgraded without breaking the applications. You were using a language (Perl, PHP, Java, whatever) which allows you to do that. C does not (at least not easily). We can and do provide backward compatibility for the kernel-userland interface (system calls), but we can't easily provide it for internal kernel APIs. DES --=20 Dag-Erling Sm=F8rgrav - des@des.no
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