OOP_(re)
Tue, 27 May 1997 16:46:48 -0400 (EDT)
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On Tue, 27 May 1997, Peter Gerwinski wrote:
> > If the VMT offset given is the same as the called constructor, then it is
> > the first constructor called and the object is initialized. If the VMT
> > parameter isn't the same as the called constructor, it is because it is
> > being called from within another constructor and hence the object is
> > already initialized. This is actually easy! ;-)
>
> Sorry, but I don't understand this (perhaps it's too easy for me;).
> How can the VMT offset be the same as a constructor? AFAIK, BP passes a
> VMT offset of zero to constructors which shall *not* initialize an object.
Hmm... Maybe you're right, it's been a few months since I booted DOS to
check this out... ;-) As far as I remember, it works like this:
o The code generated by New(TThatObject, Init) calls TThatObject.Init with
TThatObject's VMT link and nil as the Self parameter.
o TThatObject.Init does a "inherited Init", and since it is descended from
TObject, it calls TObject.Init, with TThatObject's VMT link again and
the correct Self parameter. TObject's Init constructor knows it doesn't
need to allocate memory since there Self isn't nil and doesn't
initialize the VMT of the instance since the VMT link parameter passed
is TThatObject's VMT link, not his own.
But you could very well be right regarding the VMT offset passed, it would
achieve the very same thing, and passing zero would indeed be simpler.
> > This doesn't give much information about the object apart from its size
> > and the number of methods and where they are... What we'd need is
> > something like from which class is another class derived from, its name,
> > and so on...
>
> So we should extend the VMT. Okay, why not ...
>
> BTW, somebody knows a reasonable way how to implement multiple inheritance?
I strongly advises *agains't* multiple inheritance. It is the OOP 'goto'
equivalent. Everything MI can do, you can do without MI if you design
well. C++ is the bloated monster we know today in part because of that
pseudo-feature. Neither Modula-3 or Oberon has multiple inheritance and
both have been used in programming operating systems and huges projects.
> > Hmm... Is it possible to have a function automatically generated by the
> > compiler before going to the optimizing stage? It would contain a table
> > translating VMT pointers into strings of the classes name
>
> No problem.
>
> > and would be
> > optimized out of the program by the optimizer if unused, right?
>
> True for a Program, false for a Unit. While the GPC compiler is *much*
> smarter than BP and would remove unused code and variables, the GNU linker
> is not able to remove dead code, it only does so if a whole Unit is unused.
Could this compiler generated function be generated in the program? Then
it would be optimized out if unused? On the other hand, maybe we should do
differently. In BP, there is a switch to have object symbols in for the
object browser. It is separate from the debugging symbol switch. Maybe we
could have a switch to have the object names and parent/childs
informations included, which the ClassName() and others functions would
consult. If the information isn't there, the ClassName() function would
return "Unknown", an empty string or something similar... This information
could be included in the VMT? This is more for you to decide... :-)
> > What I mean is (for example) a NewObject() function that would work just
> > like New(), but instead of a typed pointer or an object type itself, it
> > would take a VMT pointer as the first parameter. It would make the
> > construction of an object from a stream as simple as calling
> > "Get:=NewObject(TStreamRec.VMTLink, Load(@Self));" at the end of the
> > TStream.Get method.
>
> It should not be difficult to implement this using `GetMem' and an explicit
> assignment to `TypeOf'.
I think you are right, and anyway, thinking more about this, NewObject()
would be very difficult to implement correctly. And whatever we do, we'll
have to know the address of the Load constructor anyway (just like with
the BP registration system). Unless it is virtual. I think *my* object
library will have a virtual Load method (which won't be a constructor).
Ok, can you give me an example of how to create an instance of a type
specified by TypeOf? Would probably look like this:
function TStream.Get: PObject;
var
ObjID: word;
VMTLink: pointer;
LoadPtr: pointer;
P: PObject;
begin
{ here some code to read the ObjID and fetch the
corresponding VMTLink. }
GetMem(P, word(VMTLink^));
TypeOf(P):=VMTLink;
{ call the LoadPtr constructor, how do I do this correctly? }
{ With @Self as the 'normal' parameter of course... }
end;
Hmm... One thing I think isn't very clean is the way TypeOf() works "in
reverse"... It is *very* peculiar IMHO to set a value to a function! Maybe
more something like SetTypeOf(P, VMTLink)? ;-) Attached to this message is
the OBJECTS.PAS that goes with FPK-Pascal... Take a look at TObject and
TStream.Get implementations...
> > BTW, how does New() work when it is passed an object type (say, PObject)
> > as the first parameter?
>
> The compiler picks up the (constant) size of the object, calls `GetMem',
> initializes the VMT field and finally calls the constructor. (In BP, the
> value for the VMT field is passed to the constructor which does the
> assignment, but I see no reason for that.)
So a constructor does *NOTHING* more than a normal procedure? Umm... What
is the interest in a constructor then? :-)
Pierre Phaneuf
"The use of COBOL cripples the mind; its teaching should, therefore, be
regarded as a criminal offense." - Edsger W. Dijkstra.
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---305287625-1281818584-864766008=:11773--
Pierre Phaneuf (pp@dilu.ml.org)
HTML conversion by Lluís de Yzaguirre i Maura
Institut de Lingüística Aplicada -
Universitat "Pompeu Fabra"
e-mail: de_yza@upf.es