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Bootstrapped algebraic data types for Elixir

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algae lib algae free functor.ex
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lib/algae/free/functor.ex 

alias Algae.Free.{Pure, Roll}

alias Witchcraft.Functor



import TypeClass



definst Witchcraft.Functor, for: Algae.Free.Pure do

  def map(%Pure{pure: data}, fun), do: %Pure{pure: fun.(data)}

end



definst Witchcraft.Functor, for: Algae.Free.Roll do

  def map(%Roll{roll: data}, fun) do

    data

    |> Functor.map(&Functor.map(&1, fun))

    |> Roll.new()

  end

end