From: "Ara.T.Howard" <ahoward@...>
Date: 2003-11-28T01:52:14+09:00
Subject: Re: raise unless RUBY_VERSION[%r/^\s*\d+\.\d+/o].to_f >= 1.8

On Thu, 27 Nov 2003, T. Onoma wrote:

> Date: Thu, 27 Nov 2003 14:59:58 +0900
> From: T. Onoma <transami@runbox.com>
> Newsgroups: comp.lang.ruby
> Subject: Re: raise unless RUBY_VERSION[%r/^\s*\d+\.\d+/o].to_f >= 1.8
> 
> On Thursday 27 November 2003 12:12 am, Ara.T.Howard wrote:
> > On Thu, 27 Nov 2003, Paul Brannan wrote:
> > > Date: Thu, 27 Nov 2003 06:40:52 +0900
> > > From: Paul Brannan <pbrannan@atdesk.com>
> > > Newsgroups: comp.lang.ruby
> > > Subject: Re: raise unless RUBY_VERSION[%r/^\s*\d+\.\d+/o].to_f >= 1.8
> > >
> > > On Tue, Nov 25, 2003 at 08:32:14AM +0900, Ara.T.Howard wrote:
> > > > any better methods of require a specific version/set of versions?
> > >
> > > require 'rbconfig'
> > >
> > > major = Config::CONFIG['MAJOR'].to_i
> > > minor = Config::CONFIG['MINOR'].to_i
> > > teeny = Config::CONFIG['TEENY'].to_i
> > > if major < 1 or (major == 1 and minor < 8) then
> > >   raise "wrong version"
> > > end
> > >
> > > Of course, this can be wrapped into a nice version class.  I wrote one
> > > of these a long time ago and never released it, but there are plenty of
> > > others already out there.
> > >
> > > Paul
> >
> > nice!  you win paul!
> 
> not knocking paul's solution or anything, but you prefer this to using a 
> tuple?

yes.  one thing i had not yet mentioned is that i also may want to incorporate
the semantics of version.  for instance, with libtool type versioning, the
following are compatible versions:

  7.6.10
  2.0.7

this is because, with libtool, the revision's meaning is

  revision.age.impl

(see the libtool docs for more)

because revision 7 spans 6 ages, it is compatible with all versions 1 - 7.

i don't know what ruby's major, minor, teeny numbers mean but would like to do
something similar if possible. and using them in paul's way would make the
intent very clear.

-a
-- 

ATTN: please update your address books with address below!

===============================================================================
| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE   :: 303.497.6469
| ADDRESS :: E/GC2 325 Broadway, Boulder, CO 80305-3328
| STP     :: http://www.ngdc.noaa.gov/stp/
| NGDC    :: http://www.ngdc.noaa.gov/
| NESDIS  :: http://www.nesdis.noaa.gov/
| NOAA    :: http://www.noaa.gov/
| US DOC  :: http://www.commerce.gov/
|
| The difference between art and science is that science is what we
| understand well enough to explain to a computer.  
| Art is everything else.  
|   -- Donald Knuth, "Discover"
|
| /bin/sh -c 'for l in ruby perl;do $l -e "print \"\x3a\x2d\x29\x0a\"";done' 
===============================================================================