On Sunday, September 29, 2002, at 03:27 pm, Ruslan Zasukhin wrote:
> Man, this is THIRD MODEL that Valentina can support --
> Pure Object Orineted database.
>
> This is when
> 1) some classes marked as persistent
> 2) for each row in fact user get instance of that class.
>
> Here we have 2 branches:
> A) totally own implementation
> B) following by ODMG standard
>
> Agree?
Do you mean that this is the third model that Valentina will support in
2.0? I don't see it anywhere at the moment.
> I just try discuss a little with you language itself:
> Objective-C against C++ ?
>
> We can start other thread on this ?
> May be you know some URL that answer on this ?
> What can I do with Objective C more easier and effectively than in C++
> ?
Well, for example, there is a generic object type, "id". You can see if
an object responds to a selector (a selector is basically a method
name) at runtime, and if it does, make it perform that selector. You
can pass selectors as arguments to methods. etc, etc. Basically, a lot
more happens at runtime which would happen at compile time in C++. For
example, you could do something like this:
id anObject; // assume this exists and points somewhere
if ([anObject respondsToSelector:@selector(stringValue)]) {
NSString *myString = [anObject stringValue];
NSLog(@"myString: % at ", myString);
}
Perhaps not the best example, but it should give you the general idea D.O.T
I'm sure this has been discussed at length before on macosx-dev and
cocoa-dev :-)
>> I did have some code for VBitSet, VBitSetIterator, etc but I removed
>> it
>> since I didn't see it present in any of the other APIs :-)
>
> As I have mention, I think in future versions this classes must be
> added to
> ALL products that has OO support: VJDK, V4RB, VCOM, V4Cocoa.
OK, agreed.
-- Finlay
©2002 Finlay Dobbie |
