I'm wondering about the best practices for Union types. In particular,
let's say that I have a Union type
typealias RowsType Union(Int, Vector{Int}, Ranges{Int})
I have some functions which takes a parameter with one of these types, say
Base.sub(D::DataFrame, rs::RowsType) = SubDataFrame(D, rs)
My question is, is it better to parameterize this function, as
Base.sub{R<:RowsType}(D::DataFrame, rs::R) = SubDataFrame(D, rs)
Why or why not?
One rule of thumb Jeff has previously mentioned is that it's generally
unnecessary to parameterize if the type is not used in the function body.
Does that apply to Union types as well? What if the rs variable were used
more frequently in the body of the function? (e.g., if there were something
like
for x in rs
# do something
end
Looking for some clarification...
Cheers!
Kevin
