Composite Types of Arrays

General Usage Performance
1

I would like to do something like:

type Vecs{V,T}
      A::V{T}
      B::V{T}
end

where V could be Vector or SharedVector or some other specified AbstractVector and T is some sort of bits-type. I understand that I could type this in the following way:

type Vecs{T}
      A::AbstractVector{T}
      B::AbstractVector{T}
end

However, I suspect that this loses some efficiency by specifying only AbstractVector rather than SharedVector or Vector.

Alternatively, I could use:

type Vecs{T}
      A::T
      B::T
end

where T could take on things like Vector{Int64} or SharedVector{Float64}, etc., however this seems extremely inelegant.

Any suggestions? Is there something obvious Iā€™m missing? Thank you!

2

This looks elegant to me! Another option, if you want the array type as well as their element type as parameters you can use

struct Vect{T,V<:AbstractArray{T}}
    A::V
    B::V
end
5 Likes
3

Thank you for your suggestion! I have implemented your suggested solution. Though verbose, it seems superior to either of the methods I proposed. Still, it would have been nice if syntax like the following worked, as it would lead to (what I feel to be) more intuitive code:

struct Vect{T,V<:AbstractArray}
    A::V{T}
    B::V{T}
end