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BinStruct is a library which provides you rich set of tools for parsing/encoding binaries

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bin_struct lib bin_struct macro optional_nil_check_expr.ex
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lib/bin_struct/macro/optional_nil_check_expr.ex 

defmodule BinStruct.Macro.OptionalNilCheckExpression do



  @moduledoc false



  def maybe_wrap_optional(output, input, is_optional) do



    if is_optional do

      wrap_optional(output, input)

    else

      output

    end



  end



  def wrap_optional(output, input) do



    quote do



      case unquote(input) do

        nil -> nil

        unquote(input) -> unquote(output)

      end



    end



  end





end