Class::InsideOut::Manual::About 1.03

Class::InsideOut::Manual::About is a guide to this and other implementations of the inside-out technique. This manual provides an overview of the inside-out technique and its application within Class::InsideOut and other modules. It also provides a list of references for further study. Inside-out object basics Inside-out objects use the blessed reference as an index into lexical data structures holding object properties, rather than using the blessed reference itself as a data structure. $self->{ name } = "Larry"; # classic, hash-based object $name{ refaddr $self } = "Larry"; # inside-out The inside-out approach offers three major benefits: - Enforced encapsulation: object properties cannot be accessed directly from ouside the lexical scope that declared them - Making the property name part of a lexical variable rather than a hash-key means that typos in the name will be caught as compile-time errors (if using strict) - If the memory address of the blessed reference is used as the index, the reference can be of any type In exchange for these benefits, robust implementation of inside-out objects can be quite complex. Class::InsideOut manages that complexity. Philosophy of Class::InsideOut Class::InsideOut provides a set of tools for building safe inside-out classes with maximum flexibility. It aims to offer minimal restrictions beyond those necessary for robustness of the inside-out technique. All capabilities necessary for robustness should be automatic. Anything that can be optional should be. The design should not introduce new restrictions unrelated to inside-out objects, such as attributes and CHECK blocks that cause problems for mod_perl or the use of source filters for syntatic sugar. As a result, only a few things are mandatory: - Properties must be based on hashes and declared via property - Property hashes must be keyed on the Scalar::Util::refaddr - register must be called on all new objects All other implementation details, including constructors, initializers and class inheritance management are left to the user (though a very simple constructor is available as a convenience). This does requires some additional work, but maximizes freedom. Class::InsideOut is intended to be a base class providing only fundamental features. Subclasses of Class::InsideOut could be written that build upon it to provide particular styles of constructor, destructor and inheritance support..

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