Erlang Language Behaviours Using a behaviour
Example
Add a -behaviour directive to your module to indicate that it follows a behaviour:
-behaviour(gen_server).
The American spelling is also accepted:
-behavior(gen_server).
Now the compiler will give a warning if you've forgotten to implement and export any of the functions required by the behaviour, e.g.:
foo.erl:2: Warning: undefined callback function init/1 (behaviour 'gen_server')
