BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Warning : xxx hides virtual function '_fastcall xxxxx          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message JD Guest Posted: Mon Feb 02, 2004 10:21 am    Post subject: Warning : xxx hides virtual function '_fastcall xxxxx I have derived from TStringGrid and what I'm trying to do is to have my new grid take advantage of the OnSelectCell event. How I want to use it is to have the component execute the user defined OnSelectCell and based on the value of CanSelect, have the component internally execute some code: protected: DYNAMIC void __fastcall SelectCell(int ACol, int ARow, bool &CanSelect); //-------------------------------------------------------------- void __fastcall TFormulasGrid::SelectCell(int ACol, int ARow, bool &CanSelect) { inherited::SelectCell(ACol, ARow, CanSelect); if( CanSelect ) { // stuff } else { // other stuff } } //-------------------------------------------------------------- The problem is that I get two warnings and one error: [C++ Warning] TMGrid.h(63): W8022 '_fastcall TFormulasGrid::SelectCell(int,int,bool &)' hides virtual function '_fastcall TCustomDrawGrid::SelectCell(int,int)' [C++ Warning] TMGrid.h(63): W8022 '_fastcall TFormulasGrid::SelectCell(int,int,bool &)' hides virtual function '_fastcall TCustomGrid::SelectCell(int,int)' [C++ Error] TMGrid.cpp(273): E2227 Extra parameter in call to _fastcall TCustomDrawGrid::SelectCell(int,int) The error points to the line: inherited::SelectCell(ACol, ARow, CanSelect); Can I do what I want? If so, how do I go about doing it? ~ JD Back to top Michel Leunen Guest Posted: Mon Feb 02, 2004 11:05 am    Post subject: Re: Warning : xxx hides virtual function '_fastcall xxxxx JD wrote: Quote: DYNAMIC void __fastcall SelectCell(int ACol, int ARow, bool &CanSelect); [C++ Warning] TMGrid.h(63): W8022 '_fastcall TFormulasGrid::SelectCell(int,int,bool &)' hides virtual function '_fastcall TCustomDrawGrid::SelectCell(int,int)' [C++ Warning] TMGrid.h(63): W8022 '_fastcall TFormulasGrid::SelectCell(int,int,bool &)' hides virtual function '_fastcall TCustomGrid::SelectCell(int,int)' [C++ Error] TMGrid.cpp(273): E2227 Extra parameter in call to _fastcall TCustomDrawGrid::SelectCell(int,int) The virtual function SelectCell is declared as virtual bool __fastcall SelectCell(int ACol, int ARow); in TCustomGrid. Your function doesn't match this declaration. You've added an extra parameter so the compiler warns you that your function hides the SelectCell from the base class. The error you get is coming from the fact that there is no SelectCell(int,int,bool) in the base class so you can't call it. Michel -- ---------------------------------------- Michel Leunen mailto:michel (AT) leunen (DOT) com C++Builder, C++BuilderX, BCC5.5.1 Web site: http://www.leunen.com/ ---------------------------------------- Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 02, 2004 7:11 pm    Post subject: Re: Warning : xxx hides virtual function '_fastcall xxxxx "Michel Leunen" <mleu (AT) STOPSPAMskynet (DOT) be> wrote Quote: Your function doesn't match this declaration. You've added an extra parameter You've also declared the method as DYNAMIC instead of 'virtual'. They are not the same thing. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 02, 2004 7:13 pm    Post subject: Re: Warning : xxx hides virtual function '_fastcall xxxxx "JD" <nospam (AT) nospam (DOT) com> wrote Quote: How I want to use it is to have the component execute the user defined OnSelectCell and based on the value of CanSelect, have the component internally execute some code: Use this code instead: protected: virtual bool __fastcall SelectCell(int ACol, int ARow); bool __fastcall TFormulasGrid::SelectCell(int ACol, int ARow) { bool CanSelect = inherited::SelectCell(ACol, ARow); if( CanSelect ) { // stuff } else { // other stuff } return CanSelect; } Gambit Back to top JD Guest Posted: Mon Feb 02, 2004 8:21 pm    Post subject: Re: Warning : xxx hides virtual function '_fastcall xxxxx "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote: Quote: Use this code instead: Perfect - Thank you. ~ JD Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) 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.