C++ Programming/Code/Design Patterns/Structural Patterns
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[edit] Structural Patterns
[edit] Adapter
Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.
[edit] Bridge
The Bridge Pattern is used to separate out the interface from its implementation. Doing this gives the flexibility so that both can vary independently.
[edit] Composite
Composite lets clients treat individual objects and compositions of objects uniformly. The Composite pattern can represent both the conditions. In this pattern, one can develop tree structures for representing part-whole hierarchies.
[edit] Decorator
The decorator pattern helps to attach additional behavior or responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality. This is also called “Wrapper”.
[edit] Facade
The Facade Pattern hides the complexities of the system by providing an interface to the client from where the client can access the system on an unified interface. Facade defines a higher-level interface that makes the subsystem easier to use.
[edit] Flyweight
It is the use of sharing mechanism by which you can avoid creating a large number of object instances to represent the entire system by using a smaller set fine-grained objects efficiently. A flyweight is a shared object that can be used in multiple contexts simultaneously. The flyweight will act as an independent object in each context, becoming indistinguishable from an instance of the object that’s not shared. To decide if some part of a program is a candidate for using Flyweights, consider whether it is possible to remove some data from the class and make it extrinsic.
[edit] Proxy
The Proxy Pattern will provide an object a surrogate or placeholder for another object to control access to it. It is used when you need to represent a complex object with a simpler one. If creation of an object is expensive, it can be postponed until the very need arises and meanwhile a simpler object can serve as a placeholder. This placeholder object is called the “Proxy” for the complex object.
[edit] Curiously Recurring Template
This technique is known more widely as a mixin. Mixins are described in the literature to be a powerful tool for expressing abstractions.
