Transformation of Unit
to void
is baked into the compiler. There's a FuncConvert
class in F# Core for converting between FSharpFunc
and Converter
. What about defining a similar class to convert Action<T>
to Func<T, Unit>
?
static class ActionConvert {
private static readonly Unit Unit = MakeUnit();
public static Func<T, Unit> ToFunc<T>(Action<T> action) {
return new Func<T, Unit>(x => { action(x); return Unit; });
}
private static Unit MakeUnit() {
//using reflection because ctor is internal
return (Unit)Activator.CreateInstance(typeof(Unit), true);
}
}
Then you could do
var foo = new Foo<int>();
var func = ActionConvert.ToFunc<int>(foo.DoStuff);
You could probably even forego the Unit
instance and return null
instead.