Re: [Gambas-user] More on overriding native classes
2012/7/4 Benoît Minisini gam...@users.sourceforge.net Le 04/07/2012 07:55, Fabien Bodard a écrit : why if the class have the same name of an existing one you not just ignore the 'inherit' keyword, Benoit ? Because the compiler does not know that a class with the same name already exists at compile time. ok -- Benoît Minisini -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user -- Fabien Bodard -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
Le 04/07/2012 07:55, Fabien Bodard a écrit : why if the class have the same name of an existing one you not just ignore the 'inherit' keyword, Benoit ? Because the compiler does not know that a class with the same name already exists at compile time. -- Benoît Minisini -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
Le 25/06/2012 10:33, Bruce a écrit : OK, but not the answer I was hoping for. Presumably Application is needed early on in the piece. What I'm trying to work out is, if I override Application then which order does gb.Application._Init() ^ | gb.qt4.Application._Init() ^ | (my) Application.Init() get executed. gb.Application._Init() first, then gb.qt4.Application._Init, then yours. _Init is run when the class is loaded, so the order of execution follows the order of inheritance or overriding. Regards, -- Benoît Minisini -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
On Mon, 2012-06-25 at 00:47 +0200, Benoît Minisini wrote: Le 25/06/2012 00:41, Bruce a écrit : If you export a class with a name that already exists, it automatically implies inheritance with overriding. So you have a multiple inheritance error by using the Inherits keyword. Wow! That simple. Now I can do all those nefarious things I've always wanted :-) Oh, but wait, one question. Class initialisation must occur in some specific order (like constructors and inherited classes), what is it and is there any way to control it? e.g. by the order of the components and libraries in the .startup file? Bruce The only rule if that a class is initialized the first time it is needed. OK, but not the answer I was hoping for. Presumably Application is needed early on in the piece. What I'm trying to work out is, if I override Application then which order does gb.Application._Init() ^ | gb.qt4.Application._Init() ^ | (my) Application.Init() get executed. Why? Because my override is dependent on some of the gb.Application statics. Therefore I need it to execute after the gb.Application._Init, so that I can access these static properties without having to implement a late static StartMeUp method in my project's Main method to set the static Properties I want. What's even worse is that what I really,really want is my.Application._Init to be executed after some gb.db.***._Init()'s have occurred. But I think that is not possible. If you could just clarify the execution order of the inheritance chain _Init()'s I might find a way around the (nefarious) things I'm trying to do? Bruce -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
Le 18/06/2012 15:29, Bruce a écrit : On Mon, 2012-06-18 at 22:39 +0930, Bruce wrote: Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Export Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. Let me rephrase that (sometimes the keyboard is quicker than the mind.) Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see new! screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. What you should see is a very correct error message saying that Hello is an unknown method in Application. That is because it hasn't been exported. But when I go back and export the class, then I get the Multiple Inheritance error. B If you export a class with a name that already exists, it automatically implies inheritance with overriding. So you have a multiple inheritance error by using the Inherits keyword. -- Benoît Minisini -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
On Sun, 2012-06-24 at 22:52 +0200, Benoît Minisini wrote: Le 18/06/2012 15:29, Bruce a écrit : On Mon, 2012-06-18 at 22:39 +0930, Bruce wrote: Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Export Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. Let me rephrase that (sometimes the keyboard is quicker than the mind.) Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see new! screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. What you should see is a very correct error message saying that Hello is an unknown method in Application. That is because it hasn't been exported. But when I go back and export the class, then I get the Multiple Inheritance error. B If you export a class with a name that already exists, it automatically implies inheritance with overriding. So you have a multiple inheritance error by using the Inherits keyword. Wow! That simple. Now I can do all those nefarious things I've always wanted :-) Oh, but wait, one question. Class initialisation must occur in some specific order (like constructors and inherited classes), what is it and is there any way to control it? e.g. by the order of the components and libraries in the .startup file? Bruce -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
Le 25/06/2012 00:41, Bruce a écrit : If you export a class with a name that already exists, it automatically implies inheritance with overriding. So you have a multiple inheritance error by using the Inherits keyword. Wow! That simple. Now I can do all those nefarious things I've always wanted :-) Oh, but wait, one question. Class initialisation must occur in some specific order (like constructors and inherited classes), what is it and is there any way to control it? e.g. by the order of the components and libraries in the .startup file? Bruce The only rule if that a class is initialized the first time it is needed. -- Benoît Minisini -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
[Gambas-user] More on overriding native classes
The previous topic has reminded me of something. Contrary to what is said or implied in section 3.2 of the Object Model help topic, it is not possible to override several if not many native classes. Two particular instances leap to mind, Application and Error. Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Export Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. Similar things happen with Error and Class. Probably more. To keep this one short, why would I want to override Application? So I can get at more of what is in the .project file, sort of more introspection than is currently there. Any thoughts or comments? (This is a discussion post, not a bug. That is unless I've got it totally worng agian. Which given my recent strike rate could be a possibility.) Bruce attachment: shot3.png-- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
Re: [Gambas-user] More on overriding native classes
On Mon, 2012-06-18 at 22:39 +0930, Bruce wrote: Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Export Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. Let me rephrase that (sometimes the keyboard is quicker than the mind.) Try this: Create a new command line project in the IDE. Add a new class Application with the following contents ' Gambas class file Create Static Inherits Application Static Public Hello As String = Hello from South Australia Save and reload the project. In MMain.Main type the following: ?appl[Enter].he ( see new! screenshot appended) Now that, to me, looks like we have successfully overridden the Application class, but look what happens when you run it. What you should see is a very correct error message saying that Hello is an unknown method in Application. That is because it hasn't been exported. But when I go back and export the class, then I get the Multiple Inheritance error. B -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
