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moar

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A dependency-free utility library containing 100+ useful functions.

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moar lib protocol.ex
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lib/protocol.ex 

defmodule Moar.Protocol do

  # @related [test](/test/protocol_test.exs)



  @doc "Returns `x` or raises if `x` does not implment `protocol`"

  @spec implements!(any(), module()) :: any()

  def implements!(x, protocol) do

    if protocol.impl_for(x) == nil,

      do: raise("Expected #{inspect(x)} to implement protocol #{inspect(protocol)}"),

      else: x

  end

end