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17 lines
388 B
Elixir
17 lines
388 B
Elixir
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unless Code.ensure_loaded?(Comparable) do
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defprotocol Comparable do
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@moduledoc """
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Protocol which describes ordering relation for pair of types
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"""
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@type t :: Comparable.t()
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@type ord :: :gt | :lt | :eq
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@doc """
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Accepts struct with fields :left and :right and returns ord value
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"""
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@spec compare(t) :: ord
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def compare(left_and_right)
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end
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end
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