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{$mode delphi}
type
IIntf = interface
function Foo(const S: string): string;
end;
IIntf2 = interface(IIntf)
function Foo(const S: string): Integer;
end;
TIntf = class(TInterfacedObject, IIntf)
protected
{ IIntf }
function Foo(const S: string): string;
end;
TIntf2 = class(TIntf, IIntf2)
public
{ IIntf2 }
function Foo(const S: string): Integer; overload;
end;
var
erridx : longint;
{ TIntf }
function TIntf.Foo(const S: string): string;
begin
writeln('TIntf.Foo: ',S);
if erridx=0 then
erridx:=1;
result:=S;
end;
{ TIntf2 }
function TIntf2.Foo(const S: string): Integer;
begin
writeln('TIntf2.Foo: ',S);
if erridx=1 then
erridx:=2;
result:=0;
end;
var
i1 : IIntf;
i2 : IIntf2;
begin
erridx:=0;
i1:=TIntf2.Create;
i1.Foo('1234');
i2:=TIntf2.Create;
i2.Foo('1234');
if erridx<>2 then
begin
writeln('Error');
halt(1);
end;
end.
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