Set array dimensions in composite type

General Usage
7

You could try with meta programming


abstract type AbstractCompound{N} end

for N = 1:4
    name = Symbol("Compound$N")
    @eval begin
        struct $name <: AbstractCompound{$(N)} # N is the number of spatial dimensions of the field
            scalar_field :: Array{Float64,$(N)}
            vector_field :: Array{Float64,$(N+1)}
            tensor_field :: Array{Float64,$(N+2)}
        end
    end
end

julia> c = Compound1(zeros(1),zeros(1,1),zeros(1,1,1))
Compound1([0.0], [0.0], [0.0])

julia> c.tensor_field
1×1×1 Array{Float64, 3}:
[:, :, 1] =
 0.0
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