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Re^2: Per-distro versioning and dependency specification

by creamygoodness (Curate)
on Jun 06, 2012 at 11:08 UTC ( #974695=note: print w/replies, xml ) Need Help??


in reply to Re: Per-distro versioning and dependency specification
in thread Per-distro versioning and dependency specification

It's tough to handle backwards compatibility breaks sanely in a dynamic environment. I agree that if you want to avoid disruption entirely in Perl 5, package renaming is the only option, and have in fact done something like what you recommend in the past.

Things would be easier if the language offered namespace aliasing a la Python and the community had a tradition of Java-like package namespaces.

use org::apache::spamassassin3::Mail::SpamAssassin as SpamAssassin; my $spamtest = SpamAssassin->new();

Using the aliased module, you can almost get there in Perl 5, though aliased only aliases one package at a time rather than the whole hierarchy.

# Works: use aliased 'org::apache::spamassassin3::Mail::SpamAssassin'; my $spamtest = SpamAssassin->new(); # Doesn't work: use aliased org::apache::spamassassin3 => 'SA'; my $spamtest = SA::Mail::SpamAssassin->new();

Can you imagine the abuse that would rain down on someone who uploaded a tarball like org::apache::spamassassin3-3.31.tar.gz to CPAN, though?

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[atcroft]: james28909: What about October 5, 1582?
[stevieb]: atcroft: "Make both hands into fists..."... is something my Ma taught me in our native lang, but I was to ignorant and young to pay attention. Thanks for that :)
[atcroft]: stevieb: Sad to say that I only recently learned that particular trick, but I have since found it very useful.... :)
[james28909]: ill be back with a solution eventually
[stevieb]: it's a reminder to re-inforce it :P
[atcroft]: james28909: That particular questions was a bit of trick, actually (depending on the country you are in). More interesting is, if you are trying to subtract from an epoch time, for instance, you might have to consider when/if DST occurs for a location,
[atcroft]: because you may have to adjust the number of seconds you change from an epoch from 86400 (not to mention leap seconds)....
[atcroft]: james28909: Although if your program is using a database, you might be able to "pass the buck" to the database and ask it to do the date change for you....

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