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program project1;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes
{ you can add units after this };
type
IIntf1 = interface
['{87776F0F-8CE0-4881-B969-C76F5A9CA517}']
procedure M1;
end;
IIntf2 = interface
['{923C47DF-0A7E-4698-98B8-45175306CDF2}']
procedure M2;
end;
{ TObjIntf2 }
TObjIntf2 = class(TInterfacedObject, IIntf2)
procedure M2;
end;
{ TObj }
TObj = class(TInterfacedObject, IIntf1, IIntf2)
private
FObjIntf2:IIntf2;
public
constructor Create;
procedure M1;
//when implementing IIntf2 using delegation,
//TObj1.M1 is called instead of TObjIntf2
property I2:IIntf2 read FObjIntf2 implements IIntf2;
//when implementing M2 directly it works right.
//procedure M2;
end;
{ TObjIntf2 }
procedure TObjIntf2.M2;
begin
Writeln('TObjIntf2.M2 called');
end;
{ TObj }
constructor TObj.Create;
begin
FObjIntf2:=TObjIntf2.Create;
end;
procedure TObj.M1;
begin
Writeln('TObj.M1 called');
halt(1);
end;
{
procedure TObj.M2;
begin
Writeln('TObj.M2 called');
end;
}
var O:TObj;
i1:IIntf1;
i2:IIntf2;
begin
O:=TObj.Create;
i1:=O;
//all tries are unsuccessful
//i2:=O as IIntf2;
//(O as IIntf1).QueryInterface(IIntf2, i2);
i1.QueryInterface(IIntf2, i2);
//still calls TObj1.M1
i2.M2;
end.
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