From: "Ara.T.Howard" <ahoward@...>
Date: 2004-07-01T06:12:51+09:00
Subject: Re: [ANN] arrayfields-3.0.0

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On Thu, 1 Jul 2004, Jim Weirich wrote:

>
> Mauricio Fern=E1ndez said:
>> Yours has got stronger semantics than RubyGems' (which basically provide=
s
>> the methods but sets no policy), so it will work just fine if users do
>>
>>  require_gem "arrayfields", ">=3D3.1", "<4.0"
>
> Or ...
>
>   require_gem "arrayfields", "~> 3.1"
>
> You can think of the ~> operator as "approximately greater than/equal to"=
=2E
>  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 hop=
e
> thinkgs won't break).
>
> See http://rubygems.rubyforge.org/wiki/wiki.pl?UserGuide#operators for
> details.

so the gem versioning concept is similar to the libtool concept

   interface.implementation.age

minus the age bit - and a change in interface is expected to break code
whereas a change in impl, in theory, should not?

-a
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| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
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