Am 24.11.2011 17:10, schrieb Juha Manninen:
Now, if I do:
myV := TMyDerived.Create(False);
if myV is TFPGObjectList then
...
it gives:
unit1.pas(67,10) Error: Class or Object types "TMyDerived" and
"TFPGObjectList" are not related
In my opinion they are related.
Maybe generics are good only for situations where you don't need to
derive classes or test their inheritance.
They are not related. You should not think about generics as full
classes. They are merely "templates". If you do a "specialize
TFPGObjectList<SomeType>" the compiler will use the recorded declaration
and implementation of the "TFPGObjectList", replace all occurences of
the type "T" by "SomeType" and will parse the specialization as if you
had written it like that yourself.
You'd need to check against your specialized "TMyGen" instead of
"TFPGObjectList" then it would work.
In mode Delphi and my generic branch (I hope ^^) you are able to do it
like this as well:
myV := TMyDerived.Create(False);
if myV is TFPGObjectList<TMyGen> then
...
Under the condition that "TMyDerived" is declared like in your previous
mail.
Regards,
Sven
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