Object-oriented view-system for displaying information in a windowing environment

摘要

A view system is disclosed which provides support polymorphic initialization and finalization of objects. This mechanism is used by the view system to support virtual method invocation at construction/destruction time for objects that require the needed behavior. The C++ language does not support the invocation of virtual methods from within the constructor/destructor of a given object. The view system provides a mechanism whereby an initialization method is invoked after the object construction is completed, but before any methods are invoked on the constructed object. A similar mechanism is used to invoke a virtual finalization method before the object destruction is started. This mechanism is not view system-specific, but is provided and used by the view system to support such behavior.