qt object model and feature

Qt adds these features to C++:

• a very powerful mechanism for seamless object communication called 
• queryable and designable 
• powerful 
• contextual 
• sophisticated interval driven  that make it possible to elegantly integrate many tasks in an event-driven GUI
• hierarchical and queryable  that organize object ownership in a natural way
• guarded pointers () that are automatically set to 0 when the referenced object is destroyed, unlike normal C++ pointers which become dangling pointers when their objects are destroyed
• a  that works across library boundaries.