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Postings from January 2004
I tried to send this yesterday, but my home machine cannot seem to contact the
perl.org MX boxes. :~(
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.
> {
> 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've already got most of the design and coding done for a module I am calling
version::Limit (version::Incompatibility is too long to type ;~) based on my
version module. I need to finish the tests and complete the documentation.
For example (this code is working already):
> package LimitTest;
> use version::Limit;
>
> version::Limit::Scope(
> "[0.0.0,1.0.0)" => "constructor syntax has changed",
> "[2.2.4,2.3.1)" => "frobniz method croaks without second argument",
> );
> our $VERSION = "3.2.5";
and then this works:
> perl -I lib -I t -e 'use LimitTest 0.1.0;'
> Cannot 'use LimitTest 0.1.0': constructor syntax has changed at lib/version/Limit.pm line 77.
> BEGIN failed--compilation aborted at -e line 1.
However, this module will be strictly limited to 5.8.0 and later Perl's, since
it requires the enhanced v-string support only introduced in 5.8.0.
Contact me offline...
John
--
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Boulevard
Suite H
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5748