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Re: __PACKAGE__ variable cannot use as replace of package name

by kcott (Chancellor)
on Apr 23, 2013 at 08:16 UTC ( #1030066=note: print w/replies, xml ) Need Help??

in reply to __PACKAGE__ variable cannot use as replace of package name

G'day chinaxing,

I see ++moritz has described why you can't do this.

Here's a way you might emulate the behaviour you're after.

$ perl -Mstrict -Mwarnings -E ' package Testonly; our $VERSION = "1.000"; { no strict "refs"; say "NO REFS: ", ${__PACKAGE__ . "::VERSION"}; } eval { say ${__PACKAGE__ . "::VERSION"}; }; warn "REFS: $@" if $@; ' NO REFS: 1.000 REFS: Can't use string ("Testonly::VERSION") as a SCALAR ref while "st +rict refs" in use at -e line 9.

Note how I've used an anonymous namespace to isolate ${__PACKAGE__ . "::VERSION"} in a scope that doesn't check for "strict refs". The eval that follows, demonstrates that the "no strict "refs";" is no longer in effect outside the anonymous namespace.

-- Ken

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