[erlang-questions] parameterized modules and OO
Wed May 30 15:20:54 CEST 2007
Torbjorn Tornkvist wrote:
> So I was thinking, would it be possible for a parameterized module
> to modify its own module attributes ?
> So would this be possible to add without too much hassle ?
> Cheers, Tobbe
> (NB: I'm not saying this is good or bad, I'm not even proposing
> this, I'm just curious to hear if it would be easy/hard/impossible to
> add this functionality.)
- The current runtime system does not support runtime changes to the
attributes (the module_info stuff) of a module.
- The attributes are per-loaded-module ("class members" in OO
terminology), and what you probably want is a table of attributes per
module instance. That table should thus be created when you call 'new'.
There are at least two possible ways of hiding the table creation:
1: Specify the abstract module with N parameters, the last one being
the per-instance table, and insert a hand-written function new/M
where M=N-1, which calls the autogenerated new/N with a freshly
2: Separate the actual abstract module implementation and its
interface: give the abstract module some other name, and let the
interface module have a new/M function which calls the new/N
function of the abstract module with the extra parameters.
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