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Functional programming abstractions for Elixir (Beta release: APIs may change before 1.0)

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funx lib monoid max.ex
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lib/monoid/max.ex 

defmodule Funx.Monoid.Max do

  @moduledoc """

  A Monoid implementation for maximum values.

  """



  defstruct value: nil, ord: Funx.Ord

end



defimpl Funx.Monoid, for: Funx.Monoid.Max do

  alias Funx.Monoid.Max

  alias Funx.Ord.Utils



  def empty(%Max{value: min_value, ord: ord}) do

    %Max{value: min_value, ord: ord}

  end



  def append(%Max{value: a, ord: ord}, %Max{value: b}) do

    %Max{value: Utils.max(a, b, ord), ord: ord}

  end



  def wrap(%Max{ord: ord}, value) do

    %Max{value: value, ord: Utils.to_ord_map(ord)}

  end



  def unwrap(%Max{value: value}), do: value

end