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[QUOTE="Stefano Zacchiroli, post: 4545349"]
Is there a way to define per-module global variables? My best
approximation is the following

module Foo
@@x = 0
def do_something_on_x
@@x = ...
end
def x
@@x
end
end

The drawbacks are that I haven't found anything similar to
attr_reader/writer/... for instance variables.

If interested in the real use case here it is: I've defined a module
which include a set of common functionalities which need to deliver
messages with a given verbosity. I want to avoid to pass the verbosity
configuration to all the involved class and methods but I want to avoid
to use a global $verbosity variable since the setting should be limited
to all the functionalities implemented by my module.

Here is how I'm using the verbosity setting:

module Foo
@@verbosity = 0
def incr_verbosity
@@verbosity += 1
end
def verbosity
@@verbosity
end
end

I would love to write something like

module Foo
@@verbosity = 0
module_attr_reader :verbosity
def incr_verbosity
@@verbosity += 1
end
end

Am I using the wrong tool for my end?

Many thanks in advance,
Cheers.
[/QUOTE]

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