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Re: Run-time equivalent of "use Module VERSION"?

by Corion (Patriarch)
on Jul 04, 2014 at 07:50 UTC ( #1092256=note: print w/replies, xml ) Need Help??


in reply to Run-time equivalent of "use Module VERSION"?

VERSION is magic and always there for you:

> perl -wle "package VersionTest; use vars qw($VERSION); $VERSION=666;
+ package main; print VersionTest->VERSION(666); print VersionTest->VE
+RSION(667);"
666
VersionTest verion 667 required--this is only version 666 at -e line 1
+.

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Re^2: Run-time equivalent of "use Module VERSION"?
by LanX (Sage) on Jul 04, 2014 at 13:07 UTC
    > VERSION is magic and always there for you:

    elaborating a bit from perlobj#VERSION($need) :)

    UNIVERSAL::VERSION() is like ->can() a "universal"¹ method and ...

    This method is called automatically by the "VERSION" form of "use". 
         use A 1.2 qw(some imported subs);
     # implies:
     A->VERSION(1.2);

    [download]

    Cheers Rolf

    (addicted to the Perl Programming Language)

    ¹) All classes automatically inherit from the UNIVERSAL class, which is built-in to the Perl core.

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