[MLton] FFI: C void *

[Vesa A Norrman]

> I have tried both a Pointer type:
>
> ========================================================================
> C Side:
> Pointer mlton_glut_stroke_roman(void)
> {
>   return ((Pointer) GLUT_STROKE_ROMAN);
> }
>
> SML side:
>   type glutfont = Word32.word array

Where is this array coming from? why not Pointer.t?

>   val GLUT_STROKE_ROMAN = _import "mlton_glut_stroke_roman" : glutfont;

Shouldn't this have type unit -> glutfont?

>   val c_glutStrokeCharacter =
>        _import  "glutStrokeCharacter" stdcall: glutfont * int -> unit;
>   fun glutStrokeCharacter (a:glutfont) (b:int) =
>        c_glutStrokeCharacter (a,b)
> ========================================================================
>
> and a Word32.word type:
>
> ========================================================================
> C Side:
> Word32 mlton_glut_stroke_roman(void)
> {
>   return ((Word32) GLUT_STROKE_ROMAN);
> }

Is this safe? Why cast to Word32 at all? I like the first code more.

> SML Side:
>   type glutfont = Word32.word
>   val GLUT_STROKE_ROMAN = _import "mlton_glut_stroke_roman" : glutfont;

Again not arrow type?

>   val c_glutStrokeCharacter =
>        _import  "glutStrokeCharacter" stdcall: glutfont * int -> unit;
>   fun glutStrokeCharacter (a:glutfont) (b:int) =
>        c_glutStrokeCharacter
> (a,b)=======================================================================
> =

Maybe the latter is is better...
Vesa