In brief: 
$x = bless \%data, Igaro;
$x->foo(...); # calls Igaro::foo($x, ...)

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Beyond that, I suggest reading perltoot and perlobj. The newer object docs are inferior (and, annoyingly, are replaced by stubs so the link shortcuts here aren't helpful).

In reply to Re^5: OO Conversion Query - Sharing Data by educated_foo
in thread OO Conversion Query - Sharing Data by snoopy20

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