advent-of-code/2021/lib/advent_of_code/puzzle_solver.ex

defmodule AdventOfCode.PuzzleSolver do
  @moduledoc """
  Behaviour for a puzzle solution.
  """

  @doc """
  Given the input as a stream, return the solution as a string
  """
  @callback solve(Enumerable.t()) :: any()

  def solve(mod, stream), do: apply(mod, :solve, [stream])

  defmacro __using__(_) do
    quote do
      @behaviour AdventOfCode.PuzzleSolver
    end
  end
end