[julia-users] Re: Formatting function definition to accept ASCIIString AND UTF8String

[NotSoRecentConvert]

I looked at the joinpath code but couldn't tell why it had no problem using 
AbstractString to accept UFT8String or ASCIIString.

joinpath(a::AbstractString) = a
joinpath(a::AbstractString, b::AbstractString, c::AbstractString...) = 
joinpath(joinpath(a,b), c...)

function joinpath(a::AbstractString, b::AbstractString)
    isabspath(b) && return b
    A, a = splitdrive(a)
    B, b = splitdrive(b)
    !isempty(B) && A != B && throw(ArgumentError("drive mismatch: $A$a $B$b"
))
    C = isempty(B) ? A : B
    isempty(a)                             ? string(C,b) :
    ismatch(path_separator_re, a[end:end]) ? string(C,a,b) :
                                             string(C,a,pathsep(a,b),b)
end