On Tue, Dec 2, 2008 at 11:07 AM, Jorge Ortiz <[EMAIL PROTECTED]> wrote:
> I agree. Fields should be perfectly functional by just overriding members.
> But it should be mentioned in docs, etc as Lift "best practices" to not add
> methods or fields inside of Fields.
I'm not sure I would call this a best practice. The cost of making the
reflective calls is trivial.
>
>
> --j
>
>
> On Tue, Dec 2, 2008 at 1:01 PM, Marius <[EMAIL PROTECTED]> wrote:
>
>>
>> Quite right ... still I don't quite see why someone would use a Field
>> as structural type (.. or as anonymous instance) and define new -
>> overridden functions and invoke them later. Field should only override
>> functions to adapt the behavior for the needed situation.
>>
>> Nevertheless it is a very good observation !
>>
>> Br's,
>> Marius
>>
>> On Dec 2, 8:51 pm, "Jorge Ortiz" <[EMAIL PROTECTED]> wrote:
>> > class Foo
>> >
>> > // type is singleton type Bar.type
>> > object Bar extends Foo {
>> > def exc = (new Exception).printStackTrace
>> > }
>> >
>> > // type is structural type Foo{def exc: Unit}
>> > val Baz = new Foo {
>> > def exc = (new Exception).printStackTrace
>> > }
>> >
>> > // compare:
>> > Bar.exc
>> > Baz.exc
>> >
>> > Singleton types get their own .class file. Structural types use
>> reflection.
>> >
>> > --j
>> >
>> > On Tue, Dec 2, 2008 at 12:33 PM, Alex Boisvert <[EMAIL PROTECTED]>
>> wrote:
>> > > On Tue, Dec 2, 2008 at 10:24 AM, Jorge Ortiz <[EMAIL PROTECTED]
>> >wrote:
>> >
>> > >> If you add (non-overriden) fields to a val, they'll always be invoked
>> via
>> > >> reflection, which takes a performance hit. Objects, on the other
>> hand,
>> > >> define their own class so reflection isn't necessary.
>> >
>> > > Can you give an example? I can't picture this from your description.
>> >
>> > > alex
>>
>>
>
> >
>
--
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