Complex Number in Groovy

Here's a quick note of making Groovy to support complex numbers:

1. override number operations via metaclass:
Number.metaClass.plus = { n ->
  if(n instanceof Imaginary) {
    return new Complex(r:delegate, i:n.v)
  }
}

2. define class Complex to hold real, r, and imaginary, i, parts
class Complex {
  def r
  def i
  String toString() {
    "$r + ${i}i"
  }
}

3. create class Imaginary to be a wrapper class (I borrow this idea from Scala's implicit converter).
class Imaginary {
  def v
}

4. define i as a global closure. It would be in DefaultGroovyMethods, actually.
def i = { v ->
  new Imaginary(v:v)
}

Then when you write:
def b = 2 + i(2.4)
println b
println b.class

This prints "2 + 2.4i" and the type of b is class Complex.

Fortress - Hello World

Here's my early experiment of running Fortress Hello world program, which is listed below (taken from the tutorial at MIT by the Fortress team):

component hello
export Executable

run() = println("Hello, World !")

end

I'm a bit surprised that its compilation time is "really" slow. I may be guessing that it's caused by type inference in the Fortress compiler. JVM 1.6.0_12 was used in the experiment. One of my quick conclusion is that Fortress is not suitable for scripting. But I think its compiled program will not be slow (as I mentioned that I am suspecting its type inference engine that makes scripting slow).

Here's 5 times of running:

chanwit@lb /cygdrive/c/fortress/fortress_3625
$ time `bin/fortress chanwit/hello.fss`
bash: Hello,: command not found

real    0m11.393s
user    0m0.244s
sys     0m0.199s

chanwit@lb /cygdrive/c/fortress/fortress_3625
$ time `bin/fortress chanwit/hello.fss`
bash: Hello,: command not found

real    0m11.486s
user    0m0.181s
sys     0m0.214s

chanwit@lb /cygdrive/c/fortress/fortress_3625
$ time `bin/fortress chanwit/hello.fss`
bash: Hello,: command not found

real    0m11.412s
user    0m0.213s
sys     0m0.215s

chanwit@lb /cygdrive/c/fortress/fortress_3625
$ time `bin/fortress chanwit/hello.fss`
bash: Hello,: command not found

real    0m11.377s
user    0m0.197s
sys     0m0.198s

chanwit@lb /cygdrive/c/fortress/fortress_3625
$ time `bin/fortress chanwit/hello.fss`
bash: Hello,: command not found

real    0m11.432s
user    0m0.229s
sys     0m0.198s