On 24/11/2011 19:34, Jonas Maebe wrote:
In that case, you did not hit the same problem as the original poster (your "I also
hit this problem recently" is what triggered my response). His problem was that if
you call a non-virtual constructor on a class reference variable, that the constructor is
determined based on the static type of the class reference rather than on the dynamic
type.
It does not matter much but i hit the same problem. Just replace class
of TObj by class of TObject (TClass)
I stored a class (TMyClass) in a class variable (AClass: TClass). I was
expecting that calling AClass.Create would call TMyClass.Create. Just
like him i found that is not the case.
To be clear: i'm not saying that is a bug or asking for changing the
behavior
The task is accomplished by other means
See
http://code.google.com/p/emballo/source/browse/trunk/Src/Emballo.DI.Instantiator.pas#152
That's indeed a completely different technique to dynamically instantiate
classes (and if you don't really need that kind of flexibility, I would
recommend virtual constructors instead since they're much simpler and faster).
I will do in a third way, that keeps flexibility (and is also fast) but
requires more typing.
Luiz
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