lib/calc.ex


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defmodule Thulani.Calc do
  use Rustler, otp_app: :thulani, crate: "thulani_calc"

  @spec eval(String.t()) :: {:ok, number | :inf | :ninf | :nan} | {:error, String.t()}
  def eval(_expr), do: :erlang.nif_error(:nif_not_loaded)
end