For various practical reasons it's usually better to not define fields in
Scala traits, but Scala does allow it
scala> trait Foo { var x = 42 }
defined trait Foo
scala> class Bar extends Foo
defined class Bar
scala> val b = new Bar
b: Bar = b...@8be1c9
scala> b.x
res2: Int = 42
scala> b.x = 13
scala> b.x
res3: Int = 13
The main difference between Scala traits and true blue multiple class
inheritance in C++ and Python is that Scala traits can only have a default
no-arg constructor. If you need constructor arguments then you must use a
class.
On Fri, Aug 28, 2009 at 7:10 AM, Reinier Zwitserloot <[email protected]>wrote:
>
>
> automatically pick up on unless you override them. It's very similar
> to multiple inheritance, except that there's no sharing of state: A
> trait's fields aren't inherited by any classes that implement the
> trait. Just the methods.
>
>
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