Creating Dynamic Singletons & the Loki Library

摘要

My C++ program is using a third-party database library. It uses one object that represents the state of the database. The database object can be dynamically deleted to release all of its resources and it needs to be automatically deleted if it still exists at program termination. "So how am 1 going to solve this problem?" I ask myself. The "one object" requirement screams for a Singleton solution. But the ability to dynamically destroy a Singleton isn't handled by most Singleton implementations. After the Singleton has been manually destroyed, it needs to automatically resurrect itself the next time it's used in the program. Also, if the Singleton exists when the program terminates, it needs to destroy itself to release its resources.