E2251 Ambiguous overloaded call to ....
- by Eric M
I inherited some Delphi components/code that currently compiles with C++ Builder 2007. I'm simply now trying to compile the components with C++ Builder RAD XE. I don't know Delphi (object pascal).
Here are the versions of the 'Supports' functions that appear to be in conflict. Is there a compiler switch I can use to make RAD XE backward compatible? Or is there something I can do to these function calls to correct the ambiguous nature?
{$IFNDEF DELPHI5}
procedure FreeAndNil(var Obj);
var
Temp: TObject;
begin
Temp := TObject(Obj);
Pointer(Obj) := nil;
Temp.Free;
end;
function Supports(const Instance: IUnknown; const Intf: TGUID; out Inst): Boolean; overload;
begin
Result := (Instance <> nil) and (Instance.QueryInterface(Intf, Inst) = 0);
end;
function Supports(Instance: TObject; const Intf: TGUID; out Inst): Boolean; overload;
var
Unk: IUnknown;
begin
Result := (Instance <> nil) and Instance.GetInterface(IUnknown, Unk) and
Supports(Unk, Intf, Inst);
end;
{$ENDIF}
{$IFNDEF DELPHI6}
function Supports(const Instance: TObject; const IID: TGUID): Boolean;
var
Temp: IUnknown;
begin
Result := Supports(Instance, IID, Temp);
end;
{$ENDIF}
