[julia-users] Dispatch on Vector{AbstractString} as an optional parameter

[Dominique Orban]

I (think I) understand the issue in this 
thread: 
https://groups.google.com/forum/#!searchin/julia-users/AbstractString/julia-users/HBMDbnRTH9g/cuqa6hB8AQAJ
but I have the same problem with a keyword argument:

function g(s :: AbstractString; v :: Vector{AbstractString}=AbstractString
[])
   println(s)
   for e in v
       println(v)
   end
end


I need to dispatch on the optional argument `v`, so:

g{S <: AbstractString}(s :: AbstractString; v :: Vector{S}=Vector{S}[]) = g(
s, v=convert(Vector{AbstractString}, v))



but unfortunately:

julia> g("bla", ["foo", "bar"])
ERROR: MethodError: `g` has no method matching g(::ASCIIString, ::Array{
ASCIIString,1})
Closest candidates are:
  g(::AbstractString)


Moreover,

julia> g("boo")
ERROR: UndefVarError: S not defined


Any ideas?