This is how I get around the issue:
typedef Foo = @{
f = (&int) -> void
}
abstflt foo = Foo
extern castfn reveal ( foo ) : Foo
extern castfn conceal ( Foo ) : foo
impltmp
do_something<foo>( x ) =
let
val xx = reveal ( x )
var z : int = 0
in xx.f( z )
end
implfun main0 ()
= println!("Hello world")
where {
var ff : Foo = (@{
f = lam(x) => println!(x)
}) : Foo
val _ = do_something<foo>( conceal( ff ) )
}
I did a little bit more testing, using the following definitions for "foo".
// Case 1
absprop FOO
typedef foo = @{
f = (FOO | int) -> void
}
// Case 2
absview FOO
typedef foo = @{
f = ( FOO | int ) -> void
}
// Case 3
typedef foo = @{
f = {l:addr}( !(int @ l) | ptr l ) -> void
}
The first two cases worked as expected, but the last one failed in the same
way. Maybe the issue is with at-views and template dispatch, specifically.
On Wednesday, June 26, 2019 at 8:13:41 AM UTC-4, Richard wrote:
>
> On Tuesday, June 25, 2019 at 9:47:50 AM UTC-4, M88 wrote:
> > I noticed this a while ago in ATS2 (just verified in Temptory).
> >
> >
> >
> > It seems that call-by-reference functions in record definitions cause
> issues with template dispatch.
> >
>
> From what I can tell after some testing, a type defined as a function with
> call-by-reference seems to cause the same issue (even outside records).
>
> >
> > The following will fail to compile ( no match for `do_something` ) --
> changing the signature of `foo.f` to `(int) -> void` will compile
> successfully.
> >
> >
> >
> >
> >
> >
> > #include "share/HATS/temptory_staload_bucs320.hats"
> >
> > typedef foo = @{
> > f = (&int) -> void
> > }
> >
> > extern
> > fun {a:vtflt} do_something( a ) : void
> >
> > impltmp
> > do_something<foo>( x ) =
> > let
> > var z : int = 0
> > in x.f(z)
> > end
> >
> > implfun main0()
> > = println!("Hello [test0]")
> > where {
> > var ff : foo = (@{
> > f = lam(x) => println!(x)
> > }): foo
> >
> > val () = do_something<foo>(ff)
> > }
> >
> >
> >
> >
> > I've been using abstract types / casting as a work-around.
>
> Could you share how you use abstract type / casting in this example to get
> it to work?
>
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