From: Dave Bass <davebass@...>
Date: 2008-05-24T01:29:24+09:00
Subject: Re: Prevent ruby constant variables from changing?

Pe単a, Botp wrote:
> i too had this problem, and the closest i can get is to wrap the 
> constants in a module and then freeze the module.

I was inspired by Perl's use of subroutines as wrappers for constants to 
come up with the following technique. It doesn't involve modules or 
freezing:

irb(main):001:0> def self.Const
irb(main):002:1>   1
irb(main):003:1> end
=> nil
irb(main):004:0> self.Const
=> 1
irb(main):005:0> self.Const = 2
NoMethodError: undefined method `Const=' for main:Object
        from (irb):5
irb(main):006:0> self.Const
=> 1

Anyone see problems? It at least avoids accidental modification of a 
constant, and it's simple.
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