## More Patterns (cont.)

Pattern Name | Description | Example
--- | --- | ---
Factory Method | A virtual constructor can be redefined by derived classes | Collection classes that derive from a common base class redefine the create_iterator function
Flyweight | Uses shared objects instead of large numbers of separate objects with identical state | A word processor uses shared objects for styled characters rather than a separate object for each character
Interpreter | A class hierarchy represents grammar rules. The interpreter recursively evaluates a parse tree of rule objects | A program interactively evaluates mathematical expressions by building and evaluating a parse tree

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