BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Wrong overloaded function called - Cpp Builder 5          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message Hopeton Guest Posted: Fri Aug 15, 2003 6:39 pm    Post subject: Wrong overloaded function called - Cpp Builder 5 I have a Delphi component that I want to convert to C++ builder 5. I am creating a new package in c++ builder 5 where the source files are the .pas files. Everthing compiles fine and I can install the package, etc. However, the C++ builder version calls the wrong overloaded functions. It always seems to call the first declared function, regardless of the arguments that are passed. Does anyone knows why this happens? Is there some compiler directive that I might be missing on the Delphi or C++ end? Back to top Remy Lebeau (TeamB) Guest Posted: Fri Aug 15, 2003 7:34 pm    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 "Hopeton" <hopeton (AT) palmsoft (DOT) com> wrote Quote: I have a Delphi component that I want to convert to C++ builder 5. I am creating a new package in c++ builder 5 where the source files are the .pas files. Everthing compiles fine and I can install the package, etc. However, the C++ builder version calls the wrong overloaded functions. It always seems to call the first declared function, regardless of the arguments that are passed. Please provide a sample of actual code that shows what it happening. What do the original Pascal declarations look like? What does the generated C++ header file(s) look like? What does the calling C++ code look like? Gambit Back to top Hopeton Guest Posted: Fri Aug 15, 2003 11:19 pm    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 It actually happens from inside the delphi unit, but runs fine under delphi. Example: Function SetDates(StartDate,EndDate: TDateTime): boolean; overload; Function SetDates(StartDate: TDateTime; Duration: Integer): boolean; overeload; Procedure SomeOtherMethod; begin if SetDates(Now, 20) then showmessage('EndDate calculated and set'); end; When SomeOtherMethod executes in Delphi, the second SetDates method is correctly called as the second argument is an integer. However, running the same code, compiled under C++ builder 5 (using the exact pas files) executes incorrectly. The first SetDates method is called, even though the second argument is clearly an integer, not a TDateTime. "Remy Lebeau (TeamB)" <gambit47 (AT) yahoo (DOT) com> wrote Quote: "Hopeton" <hopeton (AT) palmsoft (DOT) com> wrote in message news:3f3d28e6$1 (AT) newsgroups (DOT) borland.com... I have a Delphi component that I want to convert to C++ builder 5. I am creating a new package in c++ builder 5 where the source files are the .pas files. Everthing compiles fine and I can install the package, etc. However, the C++ builder version calls the wrong overloaded functions. It always seems to call the first declared function, regardless of the arguments that are passed. Please provide a sample of actual code that shows what it happening. What do the original Pascal declarations look like? What does the generated C++ header file(s) look like? What does the calling C++ code look like? Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sat Aug 16, 2003 3:29 am    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 "Hopeton" <hopeton (AT) palmsoft (DOT) com> wrote Quote: Function SetDates(StartDate,EndDate: TDateTime): boolean; overload; Function SetDates(StartDate: TDateTime; Duration: Integer): boolean; overeload; I would expect those functions to produce an ambiquity error. I'm surprised the compile even allowed the code to finish compiling, let alone to run. You are passing a value as '20' as the second parameter. '20' can be converted to both an 'int' and a 'TDateTime' (TDateTime has an int contructor), but you're not telling the compiler what it should be. You should cast your value to the appropriate type in order to tell the compiler which actual function to call, ie: SetDates(Now, Integer(20)) SetDates(Now, TDateTime(20)) Gambit Back to top Torsten Franz (TeamBeer) Guest Posted: Mon Aug 18, 2003 11:42 am    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 Quote: Function SetDates(StartDate,EndDate: TDateTime): boolean; overload; Function SetDates(StartDate: TDateTime; Duration: Integer): boolean; overeload; I would expect those functions to produce an ambiquity error. I'm Why? 20 -> int , no conversion needed 20 ->TDateTime conversion needed (via ctor) so best match is the version taking an int, no ambiquity. Torsten Back to top Remy Lebeau (TeamB) Guest Posted: Mon Aug 18, 2003 6:02 pm    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 "Torsten Franz (TeamBeer)" <Torsten_Franz (AT) REMOVE (DOT) agilent.com> wrote in message news:3f40bb94$1 (AT) newsgroups (DOT) borland.com... Quote: 20 -> int , no conversion needed 20 ->TDateTime conversion needed (via ctor) It doesn't matter whether a conversion is needed or not. The fact that a conversion *can* occur should be ambiquious enough. 20 can be passed to TDateTime directly. So what is there to tell the compiler which one to call if it can go both ways to begin with? Gambit --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system ([url]http://www.grisoft.com)[/url]. Version: 6.0.510 / Virus Database: 307 - Release Date: 8/14/03 Back to top Torsten Franz (TeamBeer) Guest Posted: Tue Aug 19, 2003 6:39 am    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 Quote: 20 -> int , no conversion needed 20 ->TDateTime conversion needed (via ctor) It doesn't matter whether a conversion is needed or not. The fact The fact is, it should matter. Quote: that a conversion *can* occur should be ambiquious enough. 20 can be passed to TDateTime directly. So what is there to tell the compiler which one to call if it can go both ways to begin with? Of course one can specify the intended type, but this doesn't help one to understand the reasons why the compiler chooses to call the wrong funtion in the first place. Torsten Back to top Torsten Franz (TeamBeer) Guest Posted: Tue Aug 19, 2003 6:55 am    Post subject: Re: Wrong overloaded function called - Cpp Builder 5 Quote: It doesn't matter whether a conversion is needed or not. The fact that a conversion *can* occur should be ambiquious enough. 20 can be passed to TDateTime directly. So what is there to tell the compiler which one to call if it can go both ways to begin with? What about this void Func(int n){}; void Func(double d){}; .... Func(1.0d); Which function should be called here? Should the compiler flag the call ambiguous because a conversion from double to int is possible? No. The compiler needs to call the double version. Always. The same for Func(1); Now the int version call is needed. No ambiguity If the observation of the OP is right then I would call this a compiler bug. 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