From: Jim Weirich <jim@...>
Date: 2004-07-01T05:45:31+09:00
Subject: Re: [ANN] arrayfields-3.0.0


Mauricio Fern�ndez said:
> Yours has got stronger semantics than RubyGems' (which basically provides
> the methods but sets no policy), so it will work just fine if users do
>
>  require_gem "arrayfields", ">=3.1", "<4.0"

Or ...

   require_gem "arrayfields", "~> 3.1"

You can think of the ~> operator as "approximately greater than/equal to".
  It will allow any version from 3.1 upto (but not including) 4.0.  The
theory is that changes in major version number break backwards
compatibility.  I call this a pessimistic version request (you expect
things to break), where "> 3.1" is an optomistic version request (you hope
thinkgs won't break).

See http://rubygems.rubyforge.org/wiki/wiki.pl?UserGuide#operators for
details.

-- 
-- Jim Weirich     jim@weirichhouse.org    http://onestepback.org
-----------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct,
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)