Try pretending it with @which
On Wednesday, January 13, 2016, Tamas Papp <[email protected]> wrote:
> Can someone please explain me what happens when I call eg
>
> Dates.Year("100")
>
> ? From the constructor, only ::Number arguments should be accepted, yet
> this "just works" --- I am not sure it is intended though (I recall the
> manual saying somewhere that Julia does not treat strings as numbers).
>
> I reread certain parts of the manual, but I can't figure this out.
>
> Best,
>
> Tamas
>
> On Wed, Jan 13 2016, Stefan Karpinski wrote:
>
> > I suspect it's because Jacob originally wrote this code for 0.3 which
> > provided much less permissive default constructors which only worked with
> > exactly matching argument types.
> >
> > On Wednesday, January 13, 2016, Tamas Papp <[email protected]
> <javascript:;>> wrote:
> >
> >> Hi,
> >>
> >> I am reading the code of Base libraries to improve my understanding and
> >> style. In base/dates/types.jl, I noticed
> >>
> >> for T in (:Year,:Month,:Week,:Day)
> >> @eval immutable $T <: DatePeriod
> >> value::Int64
> >> $T(v::Number) = new(v)
> >> end
> >> end
> >>
> >> which expands to code like
> >>
> >> immutable Year <: DatePeriod
> >> value::Int64
> >> Year(v::Number) = new(v)
> >> end
> >>
> >> I have a simple question: what is the reason for defining the inner
> >> constructor? Wouldn't
> >>
> >> immutable Year <: DatePeriod
> >> value::Int64
> >> end
> >>
> >> automatically define one, except for restricting to ::Number? If that is
> >> the reason, I would like to understand why.
> >>
> >> Best,
> >>
> >> Tamas
> >>
>
