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