Creating many large arrays within structs

New to Julia
2

Would named tuples work for you?

julia> ab = (a=zeros(2, 2), b=zeros(2, 2))
(a = [0.0 0.0; 0.0 0.0], b = [0.0 0.0; 0.0 0.0])

julia> cd = (c=zeros(2, 2), d=zeros(1, 1))
(c = [0.0 0.0; 0.0 0.0], d = [0.0;;])

julia> abcd = (; ab..., cd...)
(a = [0.0 0.0; 0.0 0.0], b = [0.0 0.0; 0.0 0.0], c = [0.0 0.0; 0.0 0.0], d = [0.0;;])

Here, the splatting allocates a new tuple, but does not allocate the arrays inside the fields

julia> ab.a[1, 2] = 1
1

julia> abcd
(a = [0.0 1.0; 0.0 0.0], b = [0.0 0.0; 0.0 0.0], c = [0.0 0.0; 0.0 0.0], d = [0.0;;])

and can be easily passed to your struct as well:

julia> mystruct(; ab...)
mystruct
  a: Array{Float64}((2, 2)) [0.0 1.0; 0.0 0.0]
  b: Array{Float64}((2, 2)) [0.0 0.0; 0.0 0.0]
  c: Nothing nothing
  d: Nothing nothing
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