On 18/05/2012, at 3:47 AM, Raoul Duke wrote:
> otherwise known as structural typing?
Well we could say
interface Fred {
getx: 1 -> int;
};
interface Joe extends Fred {
gety: 1 -> int;
}
and it looks like Java ... :)
But it's actually just a typedef for a record type :)
And we might have
object X implements Fred {
ctor (x:int, y:int) {}
method fun getx () => x;
method fun gety() => X;
}
which is just
fun X(xint, y:int):Fred = {
fun get x() => x;
fun get y() => y;
return { getx = getx, gety=gety);
}
With that idea, we could implement Java in Felix entirely
in the grammar using Scheme as a macro processor.
The resulting objects:
(a) would dispatch faster than Java of C++
(b) would use more storage.
(a) is because they're already bound to the object.
(b) is because instead of a single vtable pointer, each object
has a pointer to *every* function, which has a pointer to the object.
So instead of space 1, it has space > 2N.
The upside is, you can make objects and declare interfaces
*after* the objects are created, saving 2^N interfaces.
If you did that in Java or C++ the compiler would die and
you'd use a LOT more memory at run time.
Note this technology also gives you "multi-methods" for free.
No one said using a function was the only way to create a record
of functions, that is, no one said all the methods had to bind
to a single piece of data (such as a function stack frame).
Also quite fun, a dynamic version of it with a string dictionary..
(JudySL) and then we have Python :)
--
john skaller
skal...@users.sourceforge.net
http://felix-lang.org
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