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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.
200
Erlang code is divided into modules. A module consists of a sequence of attributes and function declarations, each terminated by period (.). For a description of function declarations, see Function Declaration Syntax.
A module is a Python object with arbitrarily named attributes that you can bind and reference. Simply, a module is a file consisting of Python code. A module can define functions, classes and variables. A module can also include runnable code.
Erlang programs must be compiled to object code. The compiler can generate a new file that contains the object code. The current abstract machine, which runs the object code, is called BEAM, therefore the object files get the suffix .
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/
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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.
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