madeinussr
Hi, all,
Mb it’s silly question
, but: is there any possibility to define a behaviour in a function’s spec?
for example we have:
defmodule SomeBehaviour do
@callback do_it() :: any()
end
defmodule Adopter1 do
@behaviour SomeBehaviour
def do_it(), do: :done
end
defmodule Adopter2 do
@behaviour SomeBehaviour
def do_it(), do: :not_done
end
defmodule SomeModule do
# So, what's the right @spec for this function, if I'd like to specify SomeBehaviour adopters usage?
# The first thought is to use just SomeBehaviour.t with @type t :: __MODULE__ in SomeBehaviour definition,
# but as for me it seems too strict and any adopter will not pass the check
def do_it_with(adopter), do: adopter.do_it()
end
Thanks.
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michalmuskala
Probably the best you can do is to spec it as
module- the type system is not powerful enough to express something more advanced.The idea to add
@type t :: modulein the behaviour is probably a good one. While it’s still the same when checked with dialyzer, it expresses much more when treating type specs as documentation.madeinussr
Unfortunately
well, let it be
@type t :: module+@spec(SomeBehaviour.t)will check just for any module, not a behaviour adopter.