Xotcl

xotcl@alice.wu.ac.at

2 participants
653 discussions

instproc vs proc
by Laurent Duperval 13 Dec '00

13 Dec '00

Hi, When do you use instproc vs. proc? I'm looking at the code I've written so far, and it's all instproc, I make no use of proc at all. So I'm wondering if it's because proc isn't used often or because I'm missing out on something really cool. L -- MY EMAIL ADDRESS HAS CHANGED --> UPDATE YOUR ADDRESSBOOK Laurent Duperval "Montreal winters are an intelligence test, Netergy Networks - Java Center and we who are here have failed it." Phone: (514) 282-8484 ext. 228 -Doug Camilli mailto:laurent.duperval@netergynet.com Penguin Power!

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Re: [Xotcl] Object mixin with passing init args ?
by Zoran Vasiljevic 13 Dec '00

13 Dec '00

------Original Message------ From: <uwe.zdun(a)uni-essen.de> To: Gustaf.Neumann(a)wu-wien.ac.at Sent: December 13, 2000 11:33:51 AM GMT Subject: Re: [Xotcl] RE: [Xotcl] Re: [Xotcl] Object mixin with passing init args ? Wow ! After all this, what should be the best way to go ? Patch xotcl.c and fix the mixin args? Rewrite the app and wait until there is a general-elegant-allmighty solution ? What do you think ? Zoran ______________________________________________ FREE Personalized Email at Mail.com Sign up at http://www.mail.com/?sr=signup

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RE: [Xotcl] Re: [Xotcl] Object mixin with passing init args ?
by Zoran Vasiljevic 13 Dec '00

13 Dec '00

------Original Message------ From: <uwe.zdun(a)uni-essen.de> To: Zoran Vasiljevic <zoran(a)munich.com> Sent: December 13, 2000 9:55:56 AM GMT > 2. However, in the "mixin" case we could enable argument passing, > because "mixin" has just one argument? The rest could be passed > to "init". any objections? obj mixin Foo arg1 arg2 arg3 would pass arg1-arg3 to init of Foo. Right? obj mixin [list Foo Bar] arg1 arg2 arg3 would pass arg1-arg3 to init of Foo AND of Bar. Right again? Is so, then I think it should be done, if possible. 0.85 ? 0.9 ? Cheer's, Zoran ______________________________________________ FREE Personalized Email at Mail.com Sign up at http://www.mail.com/?sr=signup

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Re: [Xotcl] Object mixin with passing init args ?
by Zoran Vasiljevic 13 Dec '00

13 Dec '00

------Original Message------ From: Gustaf Neumann <Gustaf.Neumann(a)wu-wien.ac.at> To: Zoran Vasiljevic <zoran(a)munich.com> Sent: December 13, 2000 10:41:01 AM GMT Subject: [Xotcl] RE: [Xotcl] Re: [Xotcl] Object mixin with passing init args ? > from the implementation point of view this is not a big issue. >however, from my experience, i should note that i switched from a >style of "passing arguments to init" to the "-parameter style of >configuring objects", which is in almost all cases the more elegant >solution. <snip> Yes. I must admit that your reasoning is correct. One gets wierd constructs if thinking about all possible situations. But, let me explain my issue. There may be another solution. I have couple of classes impementing tree-like operations on XML files and regular filesystems. Both classes share the same abstract class, Tree (when I think of the Storage implementation in XOTcl distro, then this case would be very similar). Now, each of (Xml/Ufs) classes are mixed-in the general Tree object. Each of them needs a different argument pointing to a xml-file/file-directory where to hook on. Consider ... Class Tree ;# has abstract methods mostly Class XmlTree -superclass Tree ;# implements above methods Class UfsTree -superclass Tree ;# ... XmlTree instproc init {xmlFile} {....} UfsTree instproc init {rootDir} {....} Tree t t mixin XmlTree /path/to/xmlfile.xml ;# use the Xml driver t mixin UfsTree /some/dir ;# switch to filesystem driver Dang ! Showstopper, since I cannot pass arg to XmlTree/UfsTree. Any suggestions ? ______________________________________________ FREE Personalized Email at Mail.com Sign up at http://www.mail.com/?sr=signup

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Object mixin with passing init args ?
by Zoran Vasiljevic 13 Dec '00

13 Dec '00

Hi XOTcl gurus! Consider this: % Class Foo % Foo instproc init {dir} {puts hallo} % Class Bar % Bar bar % bar mixin Foo no value given for parameter "dir" to "init" After snooping arround I've found out that mixin's does not allow any argument passing to the mixin class initializer. Is this something normal ? If one needs such functionality are there any workarounds ? Cheer's Zoran ______________________________________________ FREE Personalized Email at Mail.com Sign up at http://www.mail.com/?sr=signup

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Thanks!
by Laurent Duperval 11 Dec '00

11 Dec '00

Hi, Thanks for all the answers to my questions. I'll read and digest them and take it from there. L -- MY EMAIL ADDRESS HAS CHANGED --> UPDATE YOUR ADDRESSBOOK Laurent Duperval "Montreal winters are an intelligence test, Netergy Networks - Java Center and we who are here have failed it." Phone: (514) 282-8484 ext. 228 -Doug Camilli mailto:laurent.duperval@netergynet.com Penguin Power!

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Packaging question
by Laurent Duperval 11 Dec '00

11 Dec '00

Hi, What is the equivalent of building a tclIndex file for xotcl classes? I want to build an app which is comprised of a whole bunch of modules. I'd like the modules to be automatically loaded when I call one of the classes defined in them. The way I do it now is: source "module1.tcl" source "module2.tcl" . . . There is most likely a better way but I'm not sure what it is. Thanks, L -- MY EMAIL ADDRESS HAS CHANGED --> UPDATE YOUR ADDRESSBOOK Laurent Duperval "Montreal winters are an intelligence test, Netergy Networks - Java Center and we who are here have failed it." Phone: (514) 282-8484 ext. 228 -Doug Camilli mailto:laurent.duperval@netergynet.com Penguin Power!

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Abstract class question
by Laurent Duperval 11 Dec '00

11 Dec '00

Hi, How do you enforce abstract methods? For example: Class Foo Foo abstract instproc procdef args Class Bar -superclass Bar instproc proc2 Bar barObj I would like an error to be thrown at the "Bar barObj" line because the Bar object doesn't define the procdef instproc. Is this rule enforceable? Is my only way at it to use assertions? Thanks, L -- MY EMAIL ADDRESS HAS CHANGED --> UPDATE YOUR ADDRESSBOOK Laurent Duperval "Montreal winters are an intelligence test, Netergy Networks - Java Center and we who are here have failed it." Phone: (514) 282-8484 ext. 228 -Doug Camilli mailto:laurent.duperval@netergynet.com Penguin Power!

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More usage questions
by Laurent Duperval 11 Dec '00

11 Dec '00

Hi, How do I do aggregation of objects? For example, in Java I have class Foo { Class1 c1; Class2 c2; } where Class1 and Class2 are two other classes. How do I create the same effect in XOTcl? I've tried a few variations but I don't get the effect I want so I guess I'm doing wrong. Also, how do you create and use private data? By this I mean data (and possibly methods) which are only accessible by the class or the object. Thanks, L -- MY EMAIL ADDRESS HAS CHANGED --> UPDATE YOUR ADDRESSBOOK Laurent Duperval "Montreal winters are an intelligence test, Netergy Networks - Java Center and we who are here have failed it." Phone: (514) 282-8484 ext. 228 -Doug Camilli mailto:laurent.duperval@netergynet.com Penguin Power!

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abstract methods again
by Laurent Duperval 11 Dec '00

11 Dec '00

Hi, TO follow up on my previous message, I'd like the following not tothrow an error: Class Abstract abstract instproc foo args Class NotAbstract -superclass Abstract NotAbstract instproc foo {arg1 arg2} {} NotAbstract obj . . . L -- MY EMAIL ADDRESS HAS CHANGED --> UPDATE YOUR ADDRESSBOOK Laurent Duperval "Montreal winters are an intelligence test, Netergy Networks - Java Center and we who are here have failed it." Phone: (514) 282-8484 ext. 228 -Doug Camilli mailto:laurent.duperval@netergynet.com Penguin Power!

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