Behaviours in Elixir, which macro to use ? ( use VS behaviour? )

[NobbZ]

@Fl4m3Ph03n1x

Why do I have to use use with GenServer instead of @behaviour ?

You do not have to.

use GenServer actually injects code that contains @behaviour GenServer as well with some boilerplate code (eg. child_spec/1).

The module attribute (not macro) @behaviour does only associate a behaviour to the module, while use injects code at the place it is used, which may or may not add a behaviour to the module.