Agreed. I just meant in the general case.
ScottB On Oct 13, 2011, at 11:30 , David Rowland wrote: > However, if the property is readonly I think you must use direct access to > set an initial value. The setter does not exist. > > > David Rowland > > On Oct 13, 2011, at 10:54 AM, Bayes Scott F wrote: > >> Thank you, David. >> >> Sounds like safety first for my code: always use the setter/getter for >> synthesized properties, even in self. >> >> Or use ivars. >> >> ScottB >> >> On Oct 12, 2011, at 09:21 , Bayes Scott F wrote: >> >>> Someone on Matt's site mentioned the possibility that the synthesized ivar >>> could be implemented indirectly, say as a member of a collection. Since the >>> implementation's opaque, we don't know if that ever can happen. >>> >>> So, is self->mySynthIvar safe (both lvalue and rvalue), or should we be >>> messaging? >>> >>> And does the compiler ever shortcut something like self.mySynthSimpleIntVar >>> to self->mySynthSimpleIntVar, or does it always use the setter/getter? >>> >>> Thanks >>> >>> >>> ScottB >>> >>> On Oct 11, 2011, at 10:12 , David Duncan wrote: >>> >>>> On Oct 11, 2011, at 9:57 AM, Matt Neuburg wrote: >>>> >>>>> I did everything "right" when I named an ivar "firstResponder" (property, >>>>> synthesized ivar, synthesized accessors) and totally broke my app because >>>>> Apple was apparently already using an undocumented ivar called >>>>> "firstResponder". >>>>> >>>>> http://www.cocoabuilder.com/archive/cocoa/296662-assign-property-behaves-differently-from-simple-instance-variable.html >>>> >>>> The problem wasn't an undocumented ivar, it was an undocumented method. >>>> The @synthesize thus overrode the existing method and broke your project >>>> because parts of UIKit were expecting the default implementation and got >>>> your implementation instead. >>>> >>>> As a rule, we strive to avoid this situation, but unfortunately this does >>>> happen on occasion. >>>> >>>>> Also, note that there are circumstances where a synthesized ivar won't >>>>> work; see, for instance, this note: >>>>> >>>>> http://www.cocoabuilder.com/archive/cocoa/298320-inherited-implicitly-created-member-is-no-member.html >>>> >>>> The gist of this is that synthesized ivars are private, and the public >>>> interface (the @property) doesn't tell you about private implementation >>>> details (the ivar). As such, subclasses can't get at synthesized ivars, >>>> precisely because the @synthesize declaration is hidden from them. >>>> -- >>>> David Duncan >>>> >>>> _______________________________________________ >>>> >>>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >>>> >>>> Please do not post admin requests or moderator comments to the list. >>>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >>>> >>>> Help/Unsubscribe/Update your Subscription: >>>> http://lists.apple.com/mailman/options/cocoa-dev/scottbayes-dev%40comcast.net >>>> >>>> This email sent to scottbayes-...@comcast.net >>> >>> _______________________________________________ >>> >>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >>> >>> Please do not post admin requests or moderator comments to the list. >>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >>> >>> Help/Unsubscribe/Update your Subscription: >>> http://lists.apple.com/mailman/options/cocoa-dev/scottbayes-dev%40comcast.net >>> >>> This email sent to scottbayes-...@comcast.net >> >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/cocoa-dev/rowlandd%40sbcglobal.net >> >> This email sent to rowla...@sbcglobal.net > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
