Typdef compilation to C#

1

Hello,

Regarding to THIS

I have a question. I have

typedef Point = Array<Float>;

which is implemented in GitHub - pboyer/verb: Open-source, cross-platform NURBS

And I try to compile to c#, but all Points are changed to object .
How can i fix it?

I can change it to for example.:

class Point extends SerializableBase {

   public var x: float;
   public var y: float;

   public function new(x, y){
        this.x= x;
        this.y= y;
   }
}

But then all places where simple array of floats is used (almost 800 places in whole lib) will be incompatible.

Any help?

2

Haxe Array is not the best structure for exposure in a cross-target library.
Because of its semantics it’s usually not mapped to native array on a target platform.
An since point is a fixed structure of two values your best bet is changing it into a class Point.
Another option is to declare Point as an abstract on top of native arrays:

private typedef Native = 
  #if cs cs.NativeArray<Float> 
  #elseif java java.NativeArray<Float>
  <...>
  #end

abstract Point(Native) {
  public var x(get,set):Float;
  inline function get_x() return this[0];
  inline function set_x(v:Float) return this[0] = v;

  public var y(get,set):Float;
  inline function get_y() return this[1];
  inline function set_y(v:Float) return this[1] = v;

  <...>
}
3

That abstract could also be iterable and offer array access instead of .x and .y to mimic Array<Float> API. That would allow to reduce required effort for adapting existing code to a new type.

4

Thank you for fast reply!!!
I’m totally new to Haxe, and I just wanted to use ready-made lib in c# but it seams problematic.

After application of your suggestion I have we:

src/verb/eval/Intersect.hx:67: characters 46-83 : error: verb.core.Point should be Array<Float>
src/verb/eval/Intersect.hx:67: characters 46-83 :  have: Array<verb.core.Point>
src/verb/eval/Intersect.hx:67: characters 46-83 :  want: Array<Array<...>>
src/verb/eval/Intersect.hx:67: characters 46-83 : For function argument 'points'

Applying Iterator maybe help me with that.
I should just follow this: Iterators - Haxe - The Cross-platform Toolkit

5

Hello,

I’ve try somethink like this:

abstract Point(Array<Float>){
    inline public function new(i:Array<Float>) {
        this = i;
      }
    @:arrayAccess
    public inline function get(k:Int) {
      return this.get(k);
    }
    @:arrayAccess
    public inline function set(k:Int, v:Float) {
        this.set(k, v);
    }
}

But still same error…

6

If you just want to use an existing library from C# and you’re new to Haxe, then it’s probably easier for you to create a test project using that lib from Haxe, build that project to Haxe/C# target and look into generated C# to get an idea how to use the library from C# without changing it.