Table of Contents
Logging container -- Log supports different types of data containers.
Examples -- How to use Log.
Initialization -- Creating a Log object
Log -- Logging abstraction class
Log::factory() -- Return a concrete Log instance of log_type.
Log::singleton() --
Log::attach() -- Attach new observer to existing list.
Log::detach() -- Detach observer from existing list.
Log::notifyAll() -- Notify all observers.
Log_Observer -- Log observer class
Log_Observer::factory -- Return a concrete Log_Observer instance of observer_type.

Implements both an abstraction for various logging mechanisms and the Subject end of a Subject-Observer pattern.

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