On Tue, Oct 13, 2015 at 5:18 PM, Erik De Rijcke <derijcke.e...@gmail.com> wrote: > > > On Tue, Oct 13, 2015 at 4:35 PM, Nils Chr. Brause <nilschrbra...@gmail.com> > wrote: >> >> Hi, >> >> On Mon, Oct 12, 2015 at 11:08 AM, Pekka Paalanen <ppaala...@gmail.com> >> wrote: >> > On Mon, 12 Oct 2015 10:41:22 +0200 >> > Erik De Rijcke <derijcke.e...@gmail.com> wrote: >> > >> >> Adding enum members is backward compatible for Java. If you compile >> >> against >> >> an enum with 2 members, and later on a new member is added, you can >> >> simply >> >> use the new version of the enum. >> >> >> >> Important however is that the order of old members do not change when >> >> new >> >> members are added. >> > >> > This is important. I don't think anyone has ever mentioned anything >> > like this before. >> > >> > We certainly have not expected the order to matter inside an <enum> >> > tag, since we require the value to be explicitly given. Not when you >> > are coming from C, anyway. >> >> In C++ the order doesn't matter either, since each entry has a defined >> value. >> I wonder why this is different in Java? > > Because Java is not C/C++. In Java, enum values are unique by instance > alone. It does not have user 'defined' value(s) that make it unique. It > *can* have user defined properties (like any object) in addition to > implicit compiler generated enum type specific properties. One of those > properties is it's "ordinal". Change the order of the enums and the ordinal > property will change, which can cause undefined behavior. Now you need to > wonder no more. :)
I'm not a Java developer, I just want to understand and help :) I suppose you couldn't just ignore the ordinal property and solely rely on some user defined propery, which holds the value defined in the XML file? > > > _______________________________________________ > wayland-devel mailing list > wayland-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/wayland-devel > _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel