Aspect of Reusability

• Classes – in source code form

• Thus, we write generic code whenever possible

• Assemblies of related classes

• A toolkit is a library of reusable classes designed to provide useful, general-purpose functionality.
• E.g., C++ standard library, Boost
• An application framework is a specific set of classes that cooperate closely with each other and together embody a reusable design for a category of problems.
• E.g., Java APIs (Applet, Thread, etc), gtkmm

• Design pattern