See https://github.com/JuliaLang/julia/issues/5533
On Aug 2, 2014 9:51 PM, <[email protected]> wrote:
> Dear Julia Colleagues,
>
> I'm writing a balanced-tree library in Julia. Balanced trees can be used
> to implement a sort-order dictionary, which is a particular implementation
> of the "Associative" abstract type, so I write:
>
> type SortOrderDict{K,V} <: Associative{K,V}
>
> where SortOrderDict is my own project.
>
> They can also be used to implement multimaps (like Dict except with
> repeated keys) and sorted sets. For sorted sets I'd like to say:
>
> type SortedSet{K} <: AbstractSet{K}
>
> where AbstractSet{K} would also include Set{K} and IntSet as subtypes.
> However, there is no such abstract type in Julia, and I'm wondering why it
> was omitted.
>
> Thanks,
> Steve Vavasis
>
> P.S. Something unexpected and very helpful happened with these types:
> When I created a SortOrderDict and assigned it to x, and then I typed just
> 'x' into the shell, I got a really nice printout of my SortOrderDict (it
> printed out like a Dict, except in the sorted order of the keys). This
> happened even though I never wrote a single line of code for printing out
> SortOrderDicts! I suppose this happened because Julia has a default way to
> print out any Associate{K,V} type.
>
>
