Re: Problem compiling using scala.swing from Maven plugin

Great, that does it.  Thank you - I hadn't thought that it might not be part
of the standard library.

Dan

David Bernard-3 wrote:
> 
> scala.swing is not part of the scala-library.
> add to your pom.xml
> 
>    <dependency>
>      <groupId>org.scala-lang</groupId>
>      <artifactId>scala-swing</artifactId>
>      <version>${scala.version}</version>
>    </dependency>
> 
> 

--

-- 
View this message in context: http://www.nabble.com/Problem-compiling-using-scala.swing-from-Maven-plugin-tp22267415p22268947.html
Sent from the Scala - User mailing list archive at Nabble.com.

Re: any explanation for scala implementation of iterable concatenation?

Re: any explanation for scala implementation of iterable concatenation?

Re: issue with implicit conversion

Hi Raphael,

Raphael Jolly wrote:
> I would like to know if this is by design, or if not, if there is a
> chance that it might be corrected in the future.

Interesting.

So the issue is that whilst

   val z = x*y
   x + z

is fine,

   x + (x*y)

is not.

The reason is that the compiler logic which decides whether an implicit
conversion is applicable or not isn't considering the types of things
given that other implicits might be applied.  If you apply either
implicit explicitly, i.e. replace either x with coef2poly(x), it copes fine.

Implicits aren't transitive by design, but this isn't quite
transitivity, and you've clearly provided a case which seems like it
ought to be permitted, though I say that without having considered the
complete ramifications of such a change...

Maybe someone else has an opinion?

Jon

--

-- 
Jon Pretty | Sygneca Ltd.

scala specs & progress bar

He,

I have the following scala specs:

mypackage.test.specific

class ATest extends JUnit4(ASpec)
object ASpec extends Specification { ... }

class BTest extends JUnit4(ASpec)
object BSpec extends Specification { ... }

mypackge.test

class AllTest extends JUnit4(
  mypackage.test.specific.ASpec,
  mypackage.test.specific.BSpec)

Both tests, ATest and BTest, are taking quite some time.  So my question is, if it is possible to display a
progress bar in eclipse's JUnit view similar to running Java JUnit tests.  For example, running similar
Java JUnit test displays the progress of each individual test and one can see the gree/ red bar increasing. 
Otherwise one always has to wait till the end of all scala specs to see the entire green/ red bar.

This is not an urgent issue, just for convenience.

Cheers,
--

-- 
Normen Müller

Re: issue with implicit conversion

Hello,

Thanks for all the responses,

Jon Pretty wrote:
> Hi Raphael,
> 
> Raphael Jolly wrote:
>> I would like to know if this is by design, or if not, if there is a
>> chance that it might be corrected in the future.
> 
> Interesting.
> 
> So the issue is that whilst
> 
>    val z = x*y
>    x + z
> 
> is fine,
> 
>    x + (x*y)
> 
> is not.
> 
> The reason is that the compiler logic which decides whether an implicit
> conversion is applicable or not isn't considering the types of things
> given that other implicits might be applied.

Then how comes this simpler example is working:

class A

class B {
  def +(that: B) = new B
}

implicit def a2b(a: A) = new B

val a = new A

a+a // works

?

> If you apply either
> implicit explicitly, i.e. replace either x with coef2poly(x), it copes fine.

yes, but coef2poly(x) + (x*y) is not a satisfying mathematical
expression. I am seeking something similar to how the computer algebra
system Sage is working.

> Implicits aren't transitive by design, but this isn't quite
> transitivity, and you've clearly provided a case which seems like it
> ought to be permitted, though I say that without having considered the
> complete ramifications of such a change...

This would be fantastic.

Raphael

Re: Re: issue with implicit conversion

Hi Raphael,

Raphael Jolly wrote:
> Then how comes this simpler example is working:
> 
> [...]

I'd guess because the '+' defined isn't overloaded by the existence of 
'+' defined on the object, but I'm only speculating...

> yes, but coef2poly(x) + (x*y) is not a satisfying mathematical
> expression. I am seeking something similar to how the computer algebra
> system Sage is working.

Oh, I wasn't seriously suggesting you did that... 

> This would be fantastic.

If nobody else has anything else to say about it in the near future, 
maybe post it as a bug report on the Scala bug tracker, and then it will 
either get fixed or rejected.

Cheers,
Jon

--

-- 
Jon Pretty | Sygneca Ltd.

Re: Re: issue with implicit conversion

>>>>> "Raphael" == Raphael Jolly <raphael.jolly@...> writes:

 Raphael> Then how comes this simpler example is working: [...]

Maybe the recursive nature of the Poly[Poly] type is what is confusing
the compiler.

I think it's a compiler bug and you should file a report.

--

-- 
Seth Tisue / http://tisue.net
lead developer, NetLogo: http://ccl.northwestern.edu/netlogo/

Re: issue with implicit conversion

Seth Tisue wrote:
>>>>>> "Raphael" == Raphael Jolly <raphael.jolly@...> writes:
> 
>  Raphael> Then how comes this simpler example is working: [...]
> 
> Maybe the recursive nature of the Poly[Poly] type is what is confusing
> the compiler.
> 
> I think it's a compiler bug and you should file a report.

done:

Issue with implicit conversion
http://lampsvn.epfl.ch/trac/scala/ticket/1756

Raphael

John Nilsson <john@...>

Re: Can Scala be compiled and run without Java?

Is that really true? GCJ can compile bytecode to machine code ahead of
time. Would there be any special reason why this wouldn't work for
bytecode generated by the scala compiler?

BR,
John

On Thu, Feb 26, 2009 at 5:18 PM, Landei <Daniel.Gronau@...> wrote:
>
>
>
> Poperecinii Timur wrote:
>>
>> Hi,
>> the nature of my question is: can Scala exist on a machine without Java?
>> Because it seems that ideologically Scala was designed with Java in mind,
>> so you can really take the best from Scala re-using the libs from Java. An
>> example could be the GUI applications in Scala, which use Swing.
>>
>> Another question can I run and compile my Scala apps without Java
>> installed on the same machine?
>> Or is it something just really build on top of Java Framework?
>>
>
> Scala needs a VM, currently either the Java VM or .NET
>
> --
> View this message in context: http://www.nabble.com/Can-Scala-be-compiled-and-run-without-Java--tp22225009p22227617.html
> Sent from the Scala - User mailing list archive at Nabble.com.
>
>