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Full Discussion: A terrific quote:
The Lounge What is on Your Mind? A terrific quote: Post 303042456 by Neo on Wednesday 25th of December 2019 09:37:24 PM
Old 12-25-2019
Merry Christmas,

Yes, and also to note - learning to program a computer does not guarantee you will be wise or develop a deeper understanding of life, physics, sciences, cultures and peoples.

Programming is but one of the many skills people should constantly strive to develop and learn.

I recommend listening to this audiobook, which I started on Christmas Eve and finished on Christmas Day. An excellent mix of physics, science, philosophy and poetry, "The Order of Time" is well written and superbly performed.

A terrific quote:-the_order_of_timejpg
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Class::ISA(3pm) 					User Contributed Perl Documentation					   Class::ISA(3pm)

NAME
Class::ISA - report the search path for a class's ISA tree SYNOPSIS
# Suppose you go: use Food::Fishstick, and that uses and # inherits from other things, which in turn use and inherit # from other things. And suppose, for sake of brevity of # example, that their ISA tree is the same as: @Food::Fishstick::ISA = qw(Food::Fish Life::Fungus Chemicals); @Food::Fish::ISA = qw(Food); @Food::ISA = qw(Matter); @Life::Fungus::ISA = qw(Life); @Chemicals::ISA = qw(Matter); @Life::ISA = qw(Matter); @Matter::ISA = qw(); use Class::ISA; print "Food::Fishstick path is: ", join(", ", Class::ISA::super_path('Food::Fishstick')), " "; That prints: Food::Fishstick path is: Food::Fish, Food, Matter, Life::Fungus, Life, Chemicals DESCRIPTION
Suppose you have a class (like Food::Fish::Fishstick) that is derived, via its @ISA, from one or more superclasses (as Food::Fish::Fishstick is from Food::Fish, Life::Fungus, and Chemicals), and some of those superclasses may themselves each be derived, via its @ISA, from one or more superclasses (as above). When, then, you call a method in that class ($fishstick->calories), Perl first searches there for that method, but if it's not there, it goes searching in its superclasses, and so on, in a depth-first (or maybe "height-first" is the word) search. In the above example, it'd first look in Food::Fish, then Food, then Matter, then Life::Fungus, then Life, then Chemicals. This library, Class::ISA, provides functions that return that list -- the list (in order) of names of classes Perl would search to find a method, with no duplicates. FUNCTIONS
the function Class::ISA::super_path($CLASS) This returns the ordered list of names of classes that Perl would search thru in order to find a method, with no duplicates in the list. $CLASS is not included in the list. UNIVERSAL is not included -- if you need to consider it, add it to the end. the function Class::ISA::self_and_super_path($CLASS) Just like "super_path", except that $CLASS is included as the first element. the function Class::ISA::self_and_super_versions($CLASS) This returns a hash whose keys are $CLASS and its (super-)superclasses, and whose values are the contents of each class's $VERSION (or undef, for classes with no $VERSION). The code for self_and_super_versions is meant to serve as an example for precisely the kind of tasks I anticipate that self_and_super_path and super_path will be used for. You are strongly advised to read the source for self_and_super_versions, and the comments there. CAUTIONARY NOTES
* Class::ISA doesn't export anything. You have to address the functions with a "Class::ISA::" on the front. * Contrary to its name, Class::ISA isn't a class; it's just a package. Strange, isn't it? * Say you have a loop in the ISA tree of the class you're calling one of the Class::ISA functions on: say that Food inherits from Matter, but Matter inherits from Food (for sake of argument). If Perl, while searching for a method, actually discovers this cyclicity, it will throw a fatal error. The functions in Class::ISA effectively ignore this cyclicity; the Class::ISA algorithm is "never go down the same path twice", and cyclicities are just a special case of that. * The Class::ISA functions just look at @ISAs. But theoretically, I suppose, AUTOLOADs could bypass Perl's ISA-based search mechanism and do whatever they please. That would be bad behavior, tho; and I try not to think about that. * If Perl can't find a method anywhere in the ISA tree, it then looks in the magical class UNIVERSAL. This is rarely relevant to the tasks that I expect Class::ISA functions to be put to, but if it matters to you, then instead of this: @supers = Class::Tree::super_path($class); do this: @supers = (Class::Tree::super_path($class), 'UNIVERSAL'); And don't say no-one ever told ya! * When you call them, the Class::ISA functions look at @ISAs anew -- that is, there is no memoization, and so if ISAs change during runtime, you get the current ISA tree's path, not anything memoized. However, changing ISAs at runtime is probably a sign that you're out of your mind! COPYRIGHT AND LICENSE
Copyright (c) 1999-2009 Sean M. Burke. All rights reserved. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR
Sean M. Burke "sburke@cpan.org" MAINTAINER
Maintained by Steffen Mueller "smueller@cpan.org". perl v5.10.1 2009-09-29 Class::ISA(3pm)
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