Simple Scala syntax - trying to define "==" operator - what am I missing?
- by Alex R
While experimenting with some stuff on the REPL, I got to a point where I needed something like this:
scala class A(x:Int) { println(x); def ==(a:A) : Boolean = { this.x == a.x; } }
Just a simple class with an "==" operator.
Why doesn't it work???
Here's the result:
:10: error: type mismatch;
found : A
required: ?{val x: ?}
Note that implicit conversions are not applicable because they are ambiguous:
both method any2ArrowAssoc in object Predef of type [A](x: A)ArrowAssoc[A]
and method any2Ensuring in object Predef of type [A](x: A)Ensuring[A]
are possible conversion functions from A to ?{val x: ?}
class A(x:Int) { println(x); def ==(a:A) : Boolean = { this.x == a.x; } }
^
This is scala 2.8 RC1.
Thanks
