On Saturday, February 15, 2014 8:49:01 PM UTC+2, Kevin Squire wrote:
>
> You might have figured this out by now, if you have a parameterized family
> of types Degree{T}, there is no unparameterized version available, so you
> either have to
>
> 1) provide a default constructor which creates the proper parameterized
> type
>
> Degree{T<:Number}(d::T) = Degree{T}(d)
>
> This is a parameterized *function* taking a parameter d, from which the
> type T is inferred, and calls the constructor for *type* Degree{T} (the T is
> part of the type). The function can then be called with Degree(num).
>
I thought such a constructor was provided by default.
Actually, my mistake was simpler than that. 150° is parsed as 150 * ° to
make writing mathematical formulas easier, but i° is simply parsed as a
variable named i°. My constructor trick only work with numeric literals. :(
It does leave the question of why
[undefine_variable for i in 1:10]
throws and error while
for i in 1:10
undefined_variable
end
doesn't.
