How to make a vector of parametric composite types?

New to Julia
6

So I am not sure exactly what you want. Maybe instead you are looking for something like this?

@enum Material Sic Al Vac

immutable Layer
   material::Material
   thickness::Float64
end

permittivity(l::Layer) = permittivity(Val{l.material})

function permittivity(::Type{Val{Al}})
   println("The permittivity of Aluminum is grand indeed")
end

function permittivity(::Type{Val{Sic}})
   println("But even grander is Silicium")
end

#Then
l = Layer(Al, 4)
permittivity(l)
l2 = Layer(Sic, 4)
permittivity(l2)

@time ml = [Layer(Al,0.0) ; Layer(Vac,0.0)]
  0.000008 seconds (7 allocations: 336 bytes)
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