The Queue constructor (like all collection constructors) takes a collection which it iterates over and converts each value it gets to the expected element type – in this case ByteString. If you iterate over "1234" you get '1' then '2' then '3' then '4' – each of which is converted to a string and then inserted into your queue.
On Thu, Feb 4, 2016 at 4:29 PM, Michael Landis <[email protected]> wrote: > DataStructures.Queue is doing strange things for me. > > Can someone please post proper syntax for forward declarations of an empty > Queue{ByteString} and maybe an in-line instantiation (if different) so I > can be sure that I am getting the declarations right? > > When I do: > using DataStructures; > qbs = Queue{ByteString}() # --> convert errors > qbs = Queue{ByteString}(0) # --> convert errors > qbs = Queue{ByteString}("") # --> no errors, so ok? > typeof(qbs) # --> > DataStructures.Queue{ByteString} (so far, so good) > length(qbs) # --> 0 (hmmm) > # which seems ok, but ... > qbs = Queue{ByteString}("1234") # ok > typeof(qbs) # --> > DataStructures.Queue{ByteString} > length(qbs) # --> 4 ??? why not 1? > enqueue!(qbs, "xyz") # --> MethodError: `push!` has > no method matching push!(::ASCIIString, ::ASCIIString ) in queue.jl:17 > x = dequeue!( qbs ) # --> MethodError: `shift!` > has no method matching shift!(::ASCIIString) in ... dequeue! at queue.jl:21 > > so... I am growing increasingly mystified. How can the type be right when > you ask for it, but wrong when you use it? Maybe I'm declaring it wrong? > Any insight or suggestions would be appreciated. >
