Re: [Module-build-general] use only The::Finest => 1.23;

[Ken W. <ke...@ma...>]

On Wednesday, February 19, 2003, at 12:46  AM, Brian Ingerson wrote:
> I've just released a module called 'only.pm' that allows people to
> install multiple versions of various modules. It also lets them 'use'
> specific versions.

I saw that flash by on the CPAN-recent list.  Looks good to me.  Glad 
it cooperates with M::B, and a patch for more explicit support would be 
welcome.  I'm not in an environment where I'd use it much, but I know 
those environments do exist when tight controls are necessary.

The only reservation I have is that it introduces a new syntax for 
version number specs, and M::B already has something similar but 
different.  It's not really essential to use the same syntax, but maybe 
some cooperation would be good.  Hopefully someone will have some good 
ideas about it in response to my "mini-language" post from yesterday.

>           # Only use MyModule if version is between 0.30 and 0.50
>           # but not 0.36; or if version is >= to 0.55.
>           use only MyModule => '0.30-0.50 !0.36 0.55-', qw(:all);

I'm not sure I understand when the parts are and-ed together and when 
they're or-ed together.  The above seems to mean

          (0.30-0.50 and !0.36) or 0.55-

or maybe actually

          (0.30-0.50 or 0.55-) and !0.36

but that's not obvious from the syntax.

  -Ken