BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  SIL and "ambiguous overload call (...)" error          BorlandTalk.com Forum Index -> Delphi OO design View previous topic :: View next topic   Author Message Jim McKay Guest Posted: Wed Jan 21, 2004 3:54 pm    Post subject: SIL and "ambiguous overload call (...)" error Hi: Is anyone using SIL (Standard Interface Library)? in unit: SilSmDataRowset, I'm getting compiler error (subject) in implementation of overloaded: Add methods in (pasted below) class. (this error new one for me! Never seen it before) On borland site, only reference I could find was (D4): http://info.borland.com/devsupport/delphi/fixes/delphi4/compiler.html which indicates to me that indeed snipped SIL code should bomb. It seems that others have got it to work, however. I get same error in D5/7. (from above borland article) Quote: Area: compilerdelphilanguageoverloadingmethod Reference Number: 345 (Published: 11/13/9 Status: Deferred to Next Rel Date Reported: 2/23/98 Severity: Commonly Encountered Type: Unknown Problem: tighten up overloading rules, and introduce a new compiler error with the message: "Method < identifier > with ambiguous parameters already exists)" Replaceing "Ambiguous overload call to ..." Steps: You should define very clearly what parameter types are considered unique with respect to define new signatures for overloaded methods. These rules should be based on single, simple goal: "There should be no possible ambiguity when calling overloaded methods with constant expressiosn". With this in mind, there should be only a few groups of parameter types that will be considered unique. For instance all integer-types would map to the same group, so that even declaring two methods with integer-type parameter at the same position would be illegal. For instance, currently this compiles: type TFoo = class public procedure Bar(A: integer); overload; procedure Bar(A: byte); overload; end; Calling Bar with a constant expression, as in : Foo.Bar(1); is clearly ambiguous, so these declaration should be disallowed altogether. Introduce a new compiler error with the message: "Method < identifier > with ambiguous parameters already exists)" This message should apply to by aliasing the following types: All string/char types: char, string, AnsiString, shortstring, type TString10=string[10], array of char, PChar All integer numeric types: byte, shortint, smallint, integer, word, cardinal, longint, int64... and declaration of offending class: Quote: TRowsetFind = class (TSilObject, IDataRowsetFind) private FRowset: IDataRowset; FIndex: IDataIndexInternal; FIdxFld: Integer; FPacket: IPacket; protected procedure DoFindEnd; virtual; protected // IDataRowsetFind procedure Add(const Value: String); overload; procedure Add(Value: Integer); overload; procedure Add(Value: Longword); overload; procedure Add(const Value: TGuid); overload; procedure Add(const Value: Double); overload; procedure Add(Value: Char); overload; procedure Add(Value: Byte); overload; procedure Add(Value: Word); overload; procedure Add(const Value: Variant); overload; function Find(First: Boolean): Boolean; virtual; public constructor Create(const Rowset: IDataRowset); destructor Destroy; override; end; According to Borland article, seems that proc(s): Add (Value: <Integer/LongWord/Byte> ) should fail, as they do. However, I'm told this is working for others. Any ideas? Thanks. -- Regards: Jim McKay Posted with: XanaNews 1.15.8.5 Back to top Jim McKay Guest Posted: Wed Jan 21, 2004 8:25 pm    Post subject: Re: SIL and "ambiguous overload call (...)" error Jim McKay wrote: Quote: Hi: Is anyone using SIL (Standard Interface Library)? in unit: SilSmDataRowset, I'm getting compiler error (subject) in implementation of overloaded: Add methods in (pasted below) class. if anyone interested, I have solution for d5/6. Additionally, author has told me they have one as well (posted on their help forum on SourceForge). -- Regards: Jim McKay " I was provided with additional input that was radically different from the truth. I assisted in furthering that version. 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