From: Nat Pryce <nat.pryce@...13media.com>
Date: 2001-11-02T04:41:16+09:00
Subject: [ruby-talk:24107] Re: C-like enum

Very neat!  I would suggest renaming enum2 to set (as the keyword is used in
Pascal languages).

E.g.

set :READ, :WRITE, :EXECUTE

Cheers,
            Nat.

----- Original Message -----
From: "Jason Voegele" <jason@jvoegele.com>
Newsgroups: comp.lang.ruby
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>; <undisclosed-recipients: ;>
Sent: Thursday, November 01, 2001 4:18 PM
Subject: [ruby-talk:24095] C-like enum


> For those of you who want a simple "enum" feature for Ruby (a-la C), try
this:
>
> module Kernel
>     # simple (sequential) enumerated values
>     def enum(*symbols, &init_val)
>         i = 0
>         if block_given?
>             i = init_val.call
>         end
>         symbols.each do |symbol|
>             module_eval("#{symbol} = i")
>             i += 1
>         end
>     end
>
>     # enumerated values suitable for bitwise OR-ing
>     def enum2(*symbols)
>         i = 1
>         count = 0
>         symbols.each do |symbol|
>             module_eval("#{symbol} = i")
>             count += 1
>             i = 2**count
>         end
>     end
> end
>
> class EnumTest
>
>     enum(:ONE, :TWO, :THREE) {1}
>
>     enum2 :READ, :WRITE, :EXECUTE
>
>     def initialize
>         puts ONE
>         puts TWO
>         puts THREE
>         puts READ
>         puts WRITE
>         puts EXECUTE
>     end
> end
>
> EnumTest.new
>
> Hope you find this useful.
>
> Jason Voegele
>