How to add class information to a "view" of array?

New to Julia
2

Use macros for operations that just pass through, eg see the code in SaferIntegers.jl and many other libraries. But I guess you would need to do something more complex for the polar points.

Incidentally, it is more idiomatic to generalize with a parametric type, eg

struct CartesianPoint{T} <: AbstractPoint{T}
    x::T
    y::T
    z::T
end

Use Mmap.mmap and/or reinterpret.

I am not sure what you want here.