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Postings from January 2004
davidnico@cpan.org (via RT) wrote:
> nobody knows about the VERSION method except people who
> have thoroughly read perldoc -f use. I believe that it
> would be a good thing if h2xs added a default VERSION
> method to the code it creates, and commented it out. This
> commented-out code would have an obvious way to edit it in
> order to create a VERSION method that knows what lower version
> numbers the current version is incompatbile with.
As the "official" VERSION maven, I'd appreciate it if this was _not_ the case.
I don't have any problem with any developer desiring a finer control overriding
the UNIVERSAL::VERSION with their own, but the thought of leading developers to
believe that they could safely do it on their own would be just dangerous.
>
> Let's say the current version is 2.3.4 and the current version
> supports the same interface as everything from 1.0.0 to 2.2.3
> but then an incompatibility was introduced in 2.2.4 which was
> taken out in 2.3.1. We would want to describe this situation
> by uncommenting the VERSION code and editing a configuration
> structure something like this:
>
> {
> my %VERSION_INCOMPATIBILITY;
>
> $VERSION_INCOMPATIBILITY{'[0.0.0,1.0.0)'} =
> "constructor syntax has changed";
> $VERSION_INCOMPATIBILITY{'[2.2.4,2.3.1)'} =
> "frobniz method croaks without second argument";
>
> sub VERSION{
> ... not sure exactly what goes here,
> but it parses (keys %VERSION_INCOMPATIBILITY)
> comparing each to the provided parameter;
> `perldoc -f use` is not clear on whether the
> desired version arrives in $_[0] or $_[1] ...
>
> }
> }
>
I think this is eminently doable with a version::Incompatible module (obviously
based on my version module ;). This would have the additional benefit that it
would act a compatibility module between multiple versions of Perl. I'm not
done with the base "version.pm" module yet (some nagging leaks), but I have a
working plan for the future.
Contact me offline...
John
--
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4720 Boston Way
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5747
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