Mixing GPU/CPU in struct definition

Specific Domains GPU
6

Yes, that is probably best, as too many type parameters are bad (e.g. really annoying in error messages). You can use something like this to avoid repetition:

julia> for (n,V) in zip([:CPUstuct, :GPUstruct], [:Vector, :CuVector])
       eval(quote
       struct $n
       a::$V{StaticArrays.SVector{3,Float64}}
       c::$V{StaticArrays.SVector{20,Float64}}
       end
       end
       )
       end

(untested)

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