Child classes shouldn't rely on private implementation details of their superclass.

Some OO languages have the concept of "protected" parts of their API somewhere between public and private — methods/attributes which subclasses may use, but are otherwise not part of the public API. In Perl, this can only really be accomplished by convention.

http://blogs.perl.org/users/toby_inkster/2014/07/method-privacy-in-perl.html

toby döt ink

In reply to Re^5: Inheritance problem: Not a HASH ref by tobyink
in thread Inheritance problem: Not a HASH ref by bliako

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