BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Delphi OO design question          BorlandTalk.com Forum Index -> Delphi Non-Technical View previous topic :: View next topic   Author Message Borland Guest Posted: Wed Jul 28, 2004 10:30 pm    Post subject: Delphi OO design question Hi, For several times I faced the following OO design problem, but never could find out a solution in Delphi. I have a class that work as a container for several smaller objets. Each of the objects should have a reference to the container class. type TContainer = class; TA = class refCont: TContainer; end; TB = class refCont: TContainer; end; TContainer = class refA: TA; refB: TB; end; As each of the classes has a lot of code, I would like to keep each of them in separate files. But I cant imagine how to write it in Delphi as separate files. Thanks in advance, Daniel Back to top Joanna Carter (TeamB) Guest Posted: Wed Jul 28, 2004 10:58 pm    Post subject: Re: Delphi OO design question "Borland" <daniel4321 (AT) terra (DOT) com.br> a écrit dans le message de news: [email]41082908 (AT) newsgroups (DOT) borland.com[/email]... Quote: For several times I faced the following OO design problem, but never could find out a solution in Delphi. 1. try using abstract classes or interfaces in a common unit to establish the links and then derive from them into your concrete classes. 2. b.p.d.oodesign is the best group for OO questions. 3. Please change your From name as I doubt you really are Borland. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Phil Shrimpton Guest Posted: Wed Jul 28, 2004 11:10 pm    Post subject: Re: Delphi OO design question Borland wrote: Hi, Quote: For several times I faced the following OO design problem, but never could find out a solution in Delphi. Change you name from Borland and take your self over to the oodesign newsgroup, as thats where the people who know hang out. Phil Back to top Daniel Felix Guest Posted: Thu Jul 29, 2004 1:51 am    Post subject: Re: Delphi OO design question First, I would like to apologize for the wrong 'from name'. I didn't notice (and understand why) that the newsgroup software assumed the server name as my own name... And thanks for the advice about the interfaces. It seems it will create an overhead of new declarations, but I think it will surely be better than a bunch of 15K lines in a sigle file as the program was written before. Back to top Daniel Becroft Guest Posted: Thu Jul 29, 2004 2:08 am    Post subject: Re: Delphi OO design question Borland wrote: Quote: Hi, For several times I faced the following OO design problem, but never could find out a solution in Delphi. I have a class that work as a container for several smaller objets. Each of the objects should have a reference to the container class. type TContainer = class; TA = class refCont: TContainer; end; TB = class refCont: TContainer; end; TContainer = class refA: TA; refB: TB; end; As each of the classes has a lot of code, I would like to keep each of them in separate files. But I cant imagine how to write it in Delphi as separate files. Just create a separate unit for each of the classes (A.pas, B.pas, Container.pas), and add a reference in the uses clause of each unit to the other. For example, unit Container; interface uses A, B; and unit A; interface uses Container; Hope that helps, -- Daniel Becroft ; ================================= "Real computer scientists don't comment their code. The identifiers are so long they can't afford the disk space." "Blue sparks and white smoke, the two most expensive components of any electrical system, and once used up will cost a fortune to replace." Back to top Joanna Carter (TeamB) Guest Posted: Thu Jul 29, 2004 6:51 am    Post subject: Re: Delphi OO design question "Daniel Becroft" <djcbecroft (AT) hotmail (DOT) com> a écrit dans le message de news: [email]xn0dlc9v83rx3h000 (AT) newsgroups (DOT) borland.com[/email]... Quote: Just create a separate unit for each of the classes (A.pas, B.pas, Container.pas), and add a reference in the uses clause of each unit to the other. Have you even tried your solution before posting? This will cause a circular reference which cannot be compiled in Delphi. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Daniel Becroft Guest Posted: Thu Jul 29, 2004 6:59 am    Post subject: Re: Delphi OO design question Joanna Carter (TeamB) wrote: Quote: "Daniel Becroft" <djcbecroft (AT) hotmail (DOT) com> a icrit dans le message de news: [email]xn0dlc9v83rx3h000 (AT) newsgroups (DOT) borland.com[/email]... Just create a separate unit for each of the classes (A.pas, B.pas, Container.pas), and add a reference in the uses clause of each unit to the other. Have you even tried your solution before posting? This will cause a circular reference which cannot be compiled in Delphi. Hmm, I have a similar solution in code that I use, and it compiles fine with D6 Personal. Go figure ... -- Daniel Becroft ; ================================= "Real computer scientists don't comment their code. The identifiers are so long they can't afford the disk space." "Blue sparks and white smoke, the two most expensive components of any electrical system, and once used up will cost a fortune to replace." Back to top Joanna Carter (TeamB) Guest Posted: Thu Jul 29, 2004 7:06 am    Post subject: Re: Delphi OO design question "Daniel Becroft" <djcbecroft (AT) hotmail (DOT) com> a écrit dans le message de news: [email]xn0dlcmz6lgep8000 (AT) newsgroups (DOT) borland.com[/email]... Quote: Hmm, I have a similar solution in code that I use, and it compiles fine with D6 Personal. Then I suggest you set up a new project in D6, ensure that the mutual references in the uses clauses are in the interface sections of each unit, as in your post, and try compiling it. Please post the result of your test. Joanna -- Joanna Carter (TeamB) Consultant Software Engineer TeamBUG support for UK-BUG TeamMM support for ModelMaker Back to top Jim Cooper Guest Posted: Thu Jul 29, 2004 8:56 am    Post subject: Re: Delphi OO design question Quote: Hmm, I have a similar solution in code that I use, and it compiles fine with D6 Personal. In that case, one of your uses clauses is in the implementation section, not the interface section Cheers, Jim Cooper _______________________________________________ Jim Cooper [email]jim (AT) falafelsoft (DOT) com[/email] Falafel Software http://www.falafelsoft.co.uk _______________________________________________ Back to top Kirk Halgren Guest Posted: Thu Jul 29, 2004 10:59 am    Post subject: Re: Delphi OO design question "Daniel Becroft" <djcbecroft (AT) hotmail (DOT) com> wrote <snip> Quote: "Blue sparks and white smoke, the two most expensive components of any electrical system, and once used up will cost a fortune to replace." Once you open the case and let out the smoke, they stop working. ;-) Kirk Halgren "I find television very educating. Every time somebody turns on the set, I go into the other room and read a book." -- Groucho Marx, 1890-1977 Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Non-Technical All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.