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First some definitions:
Factory
A class that generates instances of other classes, choosing which class to build on the basis of run-time information.
Façade
A class that acts as a front-end for one or more other classes, delegating the actual work to those classes as appropriate.

In your particular example, what you want is a factory: a class that generates objects according to where the sun rises. For example:

# Rational helper class... package Astro::Data::Scientific; use base Solar::Data; use base Lunar::Data; # <define methods here> # "Differently rational" helper class... package Astro::Data::Mythological; use base Astrological::Data; # Pre-empt normal methods use base Astro::Data::Scientific; # <overload any methods here that the # heavens dictate should behave differently> # Factory class... package Astro::Data; # Constructor returns instances of helper classes, # depending on run-time astro[nl]o[mg]ical conditions sub new { shift; # off class name if ($sun_rises_in_west) { return Astro::Data::Mythological->new(@_); } else { return Astro::Data::Scientific->new(@_); } } # <no methods of its own, since it's never actually instantiated>

In reply to Re: Modification of @ISA at run time by TheDamian
in thread Modification of @ISA at run time by jkeenan1

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