You can make an empty array of your type with
julia> MyType[]
0-element Array{MyType,1}
Would that work for you?
2014-03-08 20:44 GMT+01:00 Madeleine Udell <[email protected]>:
>
> Hi,
>
> I'd like to allow a function to take arguments that consist of arrays of
a type I've defined, or empty arrays. In many languages, one can do this
using option types; is there an analogue in julia?
>
> Concretely, I'd like to define T so that the last typeassert here will be
true:
>
> julia> type MyType
> value
> end
>
> julia> T=Union(MyType,None)
> MyType (constructor with 1 method)
>
> julia> [MyType(4)]::Array{T}
> 1-element Array{MyType,1}:
> MyType(4)
>
> julia> []::Array{T}
> ERROR: type: typeassert: expected Array{MyType,N}, got Array{None,1}
>
> Thanks!
> Madeleine
--
Med venlig hilsen
Andreas Noack Jensen
