Thanks Erik. Much appreciated...
On Mon, Feb 8, 2016 at 7:11 PM, Erik Schnetter <[email protected]> wrote:
> You need to write
>
> LeapDay(yr) = isLeapYr(yr) ? Nullable(Date(yr,2,29)) : Nullable{Date}()
>
> so that the return value is always a Nullable{Date}.
>
> -erik
>
> On Mon, Feb 8, 2016 at 10:08 PM, Michael Landis
> <[email protected]> wrote:
> > I'm so confused....
> >
> > I thought this would be cool:
> > isLeapYr(yr::Int64) = yr % 400 == 0 || (yr % 4 == 0 && yr % 100 != 0)
> > LeapDay(yr) = isLeapYr(yr) ? Date(yr,2,29) : Nullable{Date}()
> >
> > lp15 = LeapDay(2015) --> Nullable{Date}()
> > lp16 = LeapDay(2016) --> 2016-02-29
> >
> > no surprises there, but when I test the return values ...
> >
> > isnull( lp15 ) --> true
> > isnull( lp16 ) --> MethodError: `isnull` has no method matching isnull(
> > ::Date )
> >
> > What IS the secret Nullable{Date} formulation?
>
>
>
> --
> Erik Schnetter <[email protected]>
> http://www.perimeterinstitute.ca/personal/eschnetter/
>
