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  Anyone read the x10 specification yet?  (Read 1292 times)
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Offline i30817

Junior Devvie

« Posted 2009-09-16 13:56:57 »

Seems like a sweet, sweet language. I am especially impressed by array invariants (do disable bounds checking), immutable types, the forkjoin exception threading model and of course, closures (class invariants aka design by contract is not something i appreciate).
Offline Abuse

JGO Knight

Medals: 15

falling into the abyss of reality

« Reply #1 - Posted 2009-09-16 17:14:07 »

1st Paragraph, 3rd Sentence.
It is becoming increasingly difficult to mange chip power and

Page 85 (I'm skimming  persecutioncomplex)
Example 11.13.1 The following statement checks if an index is in range
and throws an exception if not.
if (i < 0 || i > x.length)
throw new IndexOutOfBoundsException();

They should get someone to proof read  Roll Eyes

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Offline i30817

Junior Devvie

« Reply #2 - Posted 2009-09-16 20:57:10 »

Holy shit.

Invariant based overloading (pattern matching).
class Point(i: Int, j: Int) {...}
class Line(s: Point, e: Point{self != i}) {
  // m1: Both points lie in the right half of the plane
  def draw(){s.i>= 0 && e.i >= 0} = {...}
  // m2: Both points lie on the y-axis
  def draw(){s.i== 0 && e.i == 0} = {...}
  // m3: Both points lie in the top half of the plane
  def draw(){s.j>= 0 && e.j >= 0} = {...}
  // m4: The general method
  def draw() = {...}

Three different implementations are given for the draw method, one for
the case in which the line lies in the right half of the plane, one for the case
that the line lies on the y-axis and the third for the case that the line lies in
the top half of the plane.
Consider the invocation
     m: Line{s.i < 0} = ...
This generates a compile time error because there is no applicable method definition.
Consider the invocation
     m: Line{s.i>=0 && s.j>=0 && e.i>=0 && e.j>=0} = ...
This generates a compile time error because both m1 and m3 are applicable.
Consider the invocation
     m: Line{s.i>=0 && s.j>=0 && e.i>=0} = ...
This does not generate any compile-time error since only m1 is applicable.
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Offline swpalmer

JGO Coder

Exp: 12 years

Where's the Kaboom?

« Reply #3 - Posted 2009-09-27 02:06:01 »

Wow!  That "Line" thing is a perfect example of over-complicating things when you are trying to do the opposite.

Online princec

« JGO Spiffy Duke »

Medals: 455
Projects: 3
Exp: 16 years

Eh? Who? What? ... Me?

« Reply #4 - Posted 2009-09-27 12:05:40 »

I want BASIC. With classes. And global functions. And no public/private/protected modifiers. I think that should do the trick.

Cas Smiley

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