Dynamically add module functions in __using__ macro

Questions & Help Questions
3

Kernel — Elixir v1.20.2 has an example similar to what you want:

defmodule A do
  defmacro __using__(_opts) do
    quote do
      def foo, do: "Foo"

      defoverridable [foo: 0]
    end
  end
end

defmodule B do
  use A

  def foo do
    super() <> "Bar"
  end
end

And then in the shell

iex(1)> B.foo()
"FooBar"