That's https://github.com/JuliaLang/julia/pull/11242. Another common
workaround is a generated function (but the wrapper function is better if
you don't need other generated functionality):
@generated function f(x...)
N = length(x)
:(Array{Int, $N})
end
On Tuesday, April 19, 2016 at 8:52:17 AM UTC-4, Milan Bouchet-Valat wrote:
>
> Hi!
>
> I'm looking for the recommended way of getting type inference to
> determine the number of elements passed via varargs.
>
> I guess a code snippet is better than a thousand words: in the
> following function, the type of a isn't inferred correctly.
>
> function f(x...)
> N = length(x)
> a = Array{Int, N}()
> # ...
> end
>
> Using a wrapper function fixes the type instability:
>
> g(x...) = g(x)
> function g{N}(x::NTuple{N})
> a = Array{Int, N}()
> #
> ...
> end
>
> Is there a better solution than this workaround?
>
>
> Regards
>
