Yes Ross, I did mean () => processForm. Thanks for the clarification.
The one thing in moving from Java to Scala is that there are a lot of
things that look similar that aren't, as you've pointed out. Newbie
error caught ;)
Thanks Marius, I made that assumption, but it still bugs me that the
scala interpreter evaluates both the "value" and the "function" when I
use:
scala> def testFunc() : Int = 3
scala> testFunc
Int = 3
scala>testFunc()
Int = 3
Strom
On Oct 27, 7:19 am, Ross Mellgren <dri...@gmail.com> wrote:
> Did you mean () => processForm by chance? () -> processForm is a pair
> of () and processForm's result.
>
> -Ross
>
> On Oct 27, 2009, at 2:52 AM, Strom wrote:
>
>
>
> > I'm not sure if this is a scala or a lift related question, but when I
> > try to bind a submit button, I'm having some confusion on using zero
> > parameter functions as the "() -> Any" parameter in the submit
> > signature.
>
> > The signature for the method in question is
> > SHtml.submit(value : String, func : () => Any, attrs : (String,
> > String)
> > *)
>
> > 1. My first question is about the following method definitions
> > def processForm () : Unit = {...}
> > vs
> > def processForm = {...} //no parentheses after method declaration
>
> > Why can I call "processForm" as well as "processForm()" for the first
> > example, but only "processForm" for the second example. If there is
> > scala/lift documentation on this simple question?
>
> > 2. Why do I get a compiler error when I use the following code:
> > bind( ...
> > "submit" -> SHtml.submit( "Process Form", processForm() ) /*type
> > mismatch error*/
> > )
> > vs
> > bind( ...
> > "submit" -> SHtml.submit( "Process Form", processForm ) /*compiles
> > successfully*/
> > )
>
> > It's my impression that the above bind calls are equivalent given the
> > way the scala compiler behaves when I call "processForm" or
> > "processForm()".
>
> > Also, I wasn't even sure the method itself would allow the code to
> > compile. I thought I'd have to do "() -> processForm" or "() ->
> > processForm()".
>
> > The error I was getting was this:
> > error type mismatch
> > found : Unit
> > required : () -> Any
>
> > Can someone please clarify? Thanks so much.
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