From: eastcoastcoder@...
Date: 2006-02-13T06:18:25+09:00
Subject: Equivalent of const modifier

Very often, I'd like to ensure (and document) that a method will not
change any of its parameters:

# This looks at, but doesn't modify, a and b
def mymethod(a, b)
end

In C++ I can do this with the const modifier.

Is there anyway to do this in Ruby?

I'd call freeze, except that would freeze the original a as well.
I'd call dup/clone and then freeze, but those aren't deep copies, from
what I understand.

So, I guess my question boils down to:
Is there a way to make a frozen, full (ie deep) copy of an object?