True, but that is not necessary in all subclasses. If we need to do that, we would probably create an internal constructor, rather than a private one. What I'd really like to see one way or the other is the ability to have non-public constructors. Ideally, that would include public, internal, and private.
At 12:32 PM 10/26/2005, you wrote: >You cant call super() when the superclass constructor is not accessible >to you > > >---------- >From: [email protected] [mailto:[EMAIL PROTECTED] On >Behalf Of Jeff Tapper >Sent: Wednesday, October 26, 2005 9:31 AM >To: [email protected] >Subject: RE: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > >Matt - > >Would subclassing really be an issue? presumably, the subclass would have >a different name than the super class, so it wont really be a method >override, or am i looking at it too simplistically? > >At 12:24 PM 10/26/2005, you wrote: > >The Player team is still thinking about it. We all want private > >constructors, but we may not get them for this release and will instead > >need to rely on the kludge like you mentioned. The consequences of the > >private constructor are not obvious but they are there (for example the > >inability to subclass since you cant create another public/protected > >constructor since we dont get overloading; fine for a singleton, maybe > >not fine in the general case) > > > > > >---------- > >From: [email protected] [mailto:[EMAIL PROTECTED] On > >Behalf Of Spike > >Sent: Wednesday, October 26, 2005 8:34 AM > >To: [email protected] > >Subject: Re: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > > > >I agree that it's a bit of a kludge, but it does provide a reliable way to > >implement the Singleton pattern. > > > >With a bit of luck MM will add private constructors to the language before > >the final release and we won't have to worry about it. > > > >My guess is that there are a couple of internal things that rely on there > >being a public constructor and that it will get added later. > > > >Spike > >On 10/26/05, Battershall, Jeff > ><<mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]> wrote: > >Spike, > > > >Thanks! Why should we have to do such a kludgy workaround, though? Why > >can't we have a private constructor if Java does? Suppose that's a > >question for the Flash Player engineering team... > > > >Jeff > >-----Original Message----- > >From: <mailto:[email protected]>[email protected] > >[mailto: [EMAIL PROTECTED] On Behalf Of Spike > >Sent: Wednesday, October 26, 2005 11:16 AM > >To: <mailto:[email protected]>[email protected] > >Subject: Re: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > > > > > >Yeah, my bad, > > > >I wrote that in the email editor and didn't test it, but hopefully it > >demonstrates the idea. > > > >Spike > >On 10/26/05, Battershall, Jeff > ><<mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED] > > wrote: > >Hmmmm....shouldn't the private var 'instance' also be static? > > > >Jeff > >-----Original Message----- > >From: <mailto:[email protected]>[email protected] > >[mailto: [EMAIL PROTECTED] On Behalf Of Spike > >Sent: Wednesday, October 26, 2005 10:50 AM > >To: <mailto:[email protected]>[email protected] > >Subject: Re: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > >package { > > public class MySingleton { > > > > private var instance:MySingleton; > > > > public MySingleton(x:PrivateClass) { > > instance = this; > > } > > > > public static getInstance():MySingleton { > > if (instance == null) { > > instance = new MySingleton(new PrivateClass()); > > } > > return instance; > > } > > } > > > > private class PrivateClass { > > > > } > >} > > > >Something like that. > > > >Spike > > > >On 10/26/05, Battershall, Jeff <<mailto:[EMAIL PROTECTED]> > >[EMAIL PROTECTED] > wrote: > >I've been playing with this a bit and my big, big question is this: How > >the heck can you create a singleton when the contructor evidently must be > >public in AS 3.0? > > > >Jeff Battershall > >Application Architect > >Dow Jones Indexes > ><mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED] > >(609) 520-5637 (p) > >(484) 477-9900 (c) > >-----Original Message----- > >From: <mailto:[email protected]>[email protected] > >[mailto: [EMAIL PROTECTED] On Behalf Of Benoit Hediard > >Sent: Tuesday, October 25, 2005 9:48 AM > >To: <mailto:[email protected]>[email protected] > >Subject: RE: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > >I don't think that bindings works on singleton instance syntax. > > > >TestLocator.as > >--------------------- > >package { > > > > public class TestLocator { > > > > private static var testLocator:TestLocator; > > > > public var someProperty:String; > > > > public static function getInstance():TestLocator { > > if(testLocator == null) > > testLocator = new TestLocator(); > > > > return testLocator; > > } > > > > public function TestLocator() { > > this.someProperty = "Some value"; > > } > > > > } > >} > > > >Test.mxml > >----------------- > ><?xml version="1.0" ?> > ><mx:Application > xmlns:mx="<<http://www.macromedia.com/2005/mxml>http://www.macromedia.com/2005/mxml> > > > ><http://www.macromedia.com/2005/mxml>http://www.macromedia.com/2005/mxml"; > xmlns="*"> > > > ><mx:Script> > > <![CDATA[ > > import TestLocator; > > > > private function onChangeClick():Void { > > TestLocator.getInstance().someProperty = 'Some other value'; > > } > > ]]> > ></mx:Script> > > > ><mx:Label text="{TestLocator.getInstance().someProperty}" /> > > > ><mx:Button label="Change value" click="onChangeClick()" /> > > > ></mx:Application> > > > >Anyway, I'll wait for the release of Cairngorm for Flex2.0 to see how > >Steven and Allistair did this part of their framework. > > > >Thanks. > > > >Benoit Hediard > > > > > >---------- > >De : <mailto:[email protected]>[email protected] > >[mailto: [EMAIL PROTECTED] De la part de Matt Chotin > >Envoyé : lundi 24 octobre 2005 19:39 > >À : <mailto:[email protected]>[email protected] > >Objet : RE: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > > > >I haven't investigated this for real but you may need to turn ModelLocator > >into a singleton so that there's an instance of an object to > >watch. Because we're doing code-gen and not prototype hacking it's > >impossible to make a Class object an EventDispatcher. The singleton > >approach would allow us to use the code-gen and then you'd simply bind to > >ModelLocator.getInstance().myModel instead of ModelLocator.myModel. > > > > > > > >Matt > > > > > > > >---------- > >From: <mailto:[email protected]>[email protected] > >[mailto: [EMAIL PROTECTED] On Behalf Of Clint Modien > >Sent: Friday, October 21, 2005 12:18 PM > >To: <mailto:[email protected]>[email protected] > >Subject: Re: [flexcoders] Implementing ModelLocator pattern in AS3/Flex2 > > > > > > > >Make the objects in the Model Locator typed.... by importing the classes > >you need to ref. > > > >On 10/21/05, Benoit Hediard <<mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED]> > >wrote: > > > >Since it is not possible to create bindings to static properties, how do > >you implement the ModelLocator pattern in AS3? > > > > > > > >Benoit Hediard > > > > > > > >PS: by the way, any information on an alpha release of Cairngorm for > Flex2.0? > > > > > > > >-- > >Flexcoders Mailing List > >FAQ: > ><<http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt>http:/ > /groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt>http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > >Search Archives: > ><<http://www.mail-archive.com/flexcoders%40yahoogroups.com>http://www.mai > l-archive.com/flexcoders%40yahoogroups.com>http://www.mail-archive.com/flexcoders%40yahoogroups.com > > > > > > > >---------- > >YAHOO! 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