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This is Class::ErrorHandler, a base class for classes that need to do error handling (which is, probably, most of them).
This module exports utility functions that are useful for factory classes.
Class::Inspector allows you to get information about a loaded class. Most or all of this information can be found in other ways, but they aren't always very friendly, and usually involve a relatively high level of Perl wizardry, or strange and unusual looking code. Class::Inspector attempts to provide an easier, more friendly interface to this information.
This library provides functions that return the list (in order) of names of (super-)classes Perl would search to find a method, with no duplicates.
require EXPR only accepts Class/Name.pm style module names, not Class::Name. How frustrating! For that, we provide load_class 'Class::Name'. It's often useful to test whether a module can be loaded, instead of throwing an error when it's not available. For that, we provide try_load_class 'Class::Name'. Finally, sometimes we need to know whether a particular class has been loaded. Asking %INC is an option, but that will miss inner packages and any class for which the filename does not correspond to the package name. For that, we provide is_class_loaded 'Class::Name'.