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binding and generics
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| Smallfernandes 2005-03-16, 8:58 pm |
| does Smalltalk support generic programing ??
it does early or late binding ???
what about type variance e object dynamic allocation ???
thanks...(I'm starting with smalltalk and I'm looking for the differences
bettwen this and JAVA :) )
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| Smallfernandes 2005-03-17, 8:58 am |
| Thanks for the answer...
could you tell me the structures used to do generic programing in
Smalltalk?
And the structures to do dynamic allocation (like new in JAVA) ?
can I do early binding in Smalltalk too ??
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| Syver Enstad 2005-03-17, 8:58 am |
| "Smallfernandes" <cafernandes@gmail.com> writes:
> Thanks for the answer...
> could you tell me the structures used to do generic programing in
> Smalltalk?
You can *ONLY* do generic programming in Smalltalk. You don't do
anything else. The types are only checked at runtime (late binding).
> And the structures to do dynamic allocation (like new in JAVA) ?
Send the message new to the class or use a custom instance creation
method.
Like this:
variable := MyFavouriteClass new.
Or (if you wrote another instance creation method).
variable := MyFavouriteClass
with: bread
and: onions.
>
> can I do early binding in Smalltalk too ??
No.
You come from a C++ background yes? Smalltalk is like other dynamic
languages such as Javascript, Python in that all programming is
generic. Templates/Generics had to be invented in C++, ADA and Eiffel
to work around the static typesystem, which is not neccesary in
dynamically typed languages such as Smalltalk.
Basically Smalltalk won't stop you from:
1 + '3' "adding a string to an integer"
It generates an exception when you run it though.
So in Smalltalk you have to check the types yourself. I find that in
practice this is much less of a problem than I thought it would be (I
have a C++ background), especially when you have good automated tests
for the project you are working on.
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| Smallfernandes 2005-03-17, 8:58 pm |
| Thanks everybody....
All my doubts are OK.
and Syver....yes I started programing with C++ and now i'm programing in
JAVA(J2SE 1.5)that has some "peculiarities", like generics that we didn't
have before.Our study group is making this research to know some
differences bettwen C++, JAVA and Smalltalk(that's new to me).
thank you again.
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