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{$ifdef fpc}
{$mode objfpc}
{$endif fpc}
uses
classes;
type
to1 = class(TObject,IInterface)
fi : IInterface;
function getfi : IInterface;virtual;
property i : IInterface read getfi implements IInterface;
end;
function to1.getfi : IInterface;
begin
result:=fi;
end;
var
o1 : to1;
i1,i2 : IInterface;
begin
o1:=to1.create;
o1.fi:=TInterfacedObject.Create;
i1:=o1;
i1.QueryInterface(IInterface,i2);
if i2=nil then
halt(1);
o1.fi:=nil;
i1.QueryInterface(IInterface,i2);
if i2=nil then
halt(1);
o1.free;
i1.QueryInterface(IInterface,i2);
if i2=nil then
halt(1);
writeln('ok');
end.
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