Thank you for the pointers: I had not seen these issues.
S.
On Tuesday, 2 February 2016 09:11:32 UTC, Mauro wrote:
>
> > For the purposes of readability, is there any syntax by which I can
> avoid
> > explicit parameterisation of the function? I am thinking of something
> like
> > this:
> >
> > function fun(arr::Array{<:Type3, 1})
> > end
>
> No, there is none but it has been discussed
> https://github.com/JuliaLang/julia/issues/6984. But function signatures
> may change quite a bit in the near future anyway, see for instance:
> https://github.com/JuliaLang/julia/issues/11310#issuecomment-170421099
>
> > S.
> >
> > On Tuesday, 2 February 2016 06:27:10 UTC, Mauro wrote:
> >>
> >> On Mon, 2016-02-01 at 18:29, Samuel Powell <[email protected]
> >> <javascript:>> wrote:
> >> > Hi,
> >> >
> >> > Consider the following:
> >> >
> >> > abstract TypeA
> >> >
> >> > type Type1 <: TypeA
> >> > end
> >> >
> >> > type Type2 <: TypeA
> >> > end
> >> >
> >> > type Type3{T<:TypeA}
> >> > prof::T
> >> > end
> >> >
> >> > function fun(arr::Array{Type3, 1})
> >> > end
> >> >
> >> > t1 = Type1()
> >> > t2 = Type2()
> >> >
> >> > t3_1 = Type3(t1)
> >> > t3_2 = Type3(t2)
> >> >
> >> > fun([t3_1; t3_2]) # This is fine
> >> > fun([t3_1; t3_1]) # This fails with a no method error
> >> > fun([t3_2; t3_2]) # This fails with a no method error
> >>
> >> This is because of invariance (search the doc or julia-users for it):
> >>
> >> julia> Array{Type3{Type1}}<:Array{Type3}
> >> false
> >>
> >> This works:
> >>
> >> julia> function fun{T<:Type3}(arr::Array{T, 1})
> >> end
> >> fun (generic function with 2 methods)
> >>
> >> julia> fun([t3_1; t3_1])
> >>
>
