问题
I am new to Erlang. Found the following -module attribute declaration in an existing Erlang project:
-module(mod_name, [Name, Path, Version]).
What does mean the second parameter (list [Name, Path, Version]) here?
I haven't found any information in the Erlang reference on it.
回答1:
This defines a parameterised erlang module - one you can "instantiate" with new and then access the parameters passed by that new when executing code in your module.
A very brief overview is here:
http://myotherpants.com/2009/04/parameterized-modules-in-erlang/
回答2:
This is a parametrized module. Here is the original paper on it. Basically you can create instances of the module binding specific values to those variables. You can initialize one as:
> Mod = mod_name:new("MyName", "/path", '0.1').
and then call its functions as:
> Mod:function(...)
where the module parameters are also available in the function body.
来源：https://stackoverflow.com/questions/1358230/erlang-module-attribute