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This should work

by Anonymous Monk
on Dec 29, 1999 at 10:04 UTC ( #1468=perlquestion: print w/replies, xml ) Need Help??
Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

use Set::Scalar; use Set::Scalar::Valued; $foo = Set::Scalar::Valued->new; $foo->insert("bar", Set::Scalar->new); $foo->value("bar")->insert("baz"); # But I get 'Can't call method 'insert' on unblessed # reference at test.pl line 6.' What's the deal oh wise # ones?

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RE: This should work
by chromatic (Archbishop) on Apr 01, 2000 at 11:07 UTC
    I think you need to create your "bar" object explicitly before you insert() it into "foo". (An "unblessed reference" is something that you're treating as an object before Perl knows it's an object. See bless.)

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[Eily]: if so, most subs start with my (VARIABLES) = @_ anyway
[moritz]: for short subs, I sometimes let them work on $_[0] directly
[Eily]: moritz but that should be fine unless you modify them
[choroba]: if you modify them, Perl will crash with "Modification of a read-only value attempted" for $1
[choroba]: I can't replicate the situation, but I remember it was very hard to debug

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