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code.exs

defmodule M do
  defmacro __using__(_args) do
    quote do
      @count 0
      import unquote(__MODULE__), only: :macros
    end
  end
  
  defmacro p do
    quote do
      @count @count + 1
      
      def p_unquote(@count), do: @count
    end
  end
end

defmodule A do
  use M
  
  p()
  p()
  p()
end

IO.puts A.p_1()