Re: [libvirt] [libvirt-go PATCH 2/2] Introduce DomainMigrateMaxSpeedFlags constant

On Mon, Feb 11, 2019 at 04:11:55PM +0100, Erik Skultety wrote: FWIW, Erik asked me about this change off-list. Technically changing the flags parameter from uint32 to the named enum type is considered an API incompatible change. In practice though, the flags parameter was unused in the past, so applications should normally have been passing an untyped '0' inline.eg dom.MigrateSetMaxSpeed(1024*1024, 0) Go will happily do type inference there, so with this change it will simply interpret '0' as being a value in the enum type. There should not be any compile breakage in this case. Where it could be a problem is if the app used an intermediate typed variable var flags uint32 flags = 0 dom.MigrateSetMaxSpeed(1024*1024, flags) This could conceivably affect some app, but I think it is fairly unlikely since there's no compelling reason for the app to have used a variable for flags given that it was unused. On balance with previous cases like this I took the view that it is preferrable to change the enum type so we get better type checking over the long term, despite this small risk/ Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|