--- Zeev Suraski <[EMAIL PROTECTED]> wrote:
> At 00:55 09/04/2002, brad lafountain wrote:
> > Well i would have totally agreed with you yesterday.. but i have convinced
> >myself that there is use for aggregation. Me personally i would never use
> it.
> >But i can see somepeople using it.
>
> It doesn't mean it's a good idea to add it. I used both, and yes,
> aggregation makes sense in some cases, but having them both in the language
> is like a supermarket of everything, and that's never good.
>
> >But giving the user a way to "MI" without having "MI" support(aggregation)
> >will
> >create alot of messy code. It wont even give the user a change to write
> >good OO
> >code.
> >
> >Can you explain why you can't see room for both of them?
>
> Aggregation is typically supported in userland, in the rare cases where
> it's really required (through wrapper methods that relay calls to a member
> object). Having them both will confuse people. Even people with some OO
> experience won't find it trivial to decide which they should use.
But do you see my point that having ONLY aggregate means that in 90% of the
case where people will use it its probally a bad idea. They are only using it
becuase of the lack of MI. How does aggregation solve overwriting methods.
class a
{
function blah()
{
echo "in a";
}
}
class b
{
function blah()
{
echo "in b";
}
}
class c
{
function blah()
{
echo "in c";
}
}
class d extends a,b,c
{
function blah()
{
echo a::blah() . b::blah() . c::blah();
}
}
how do you do that with aggregation? MI really is way different than
aggregation.
I see aggregation used for adding methods to an existing class.
class a
{
function do_a()
{
}
}
class b
{
function do_b()
{
}
}
$c = new stdclass;
aggregate($c, "a");
aggregate($c, "b");
$c->do_a();
$c->do_b();
but i still don't like this... there are cleaner ways around that by using
members and/or MI.
- Brad
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