About Bridge Mode

 LApplicability

NClass abstraction and its implementation should be expanded by generating sub-classes.

NIf any extension causes the class to grow with a geometric level, it means that you need to break down an object into two parts, which are called "nested generalization ".Nested generalizations";

LGenerally speaking,ImplementorOnly some basic operations are provided, whileAbastractionSome high-level operations based on these basic operations are defined.

LBridge patternAdvantages:

NYes, interfaces and implementations are separated. The implementation of an abstract class can be configured at runtime, and an object can even change its implementation at runtime.

NImprove the extensibility: You can separatelyInvalid actionOrImplementor.

NThe implementation details are transparent to the customer, and you can completely hide the details from the customer. InC ++Medium,ImplementorClass interfaces can be defined in a seemingly header file. This file is not provided to the customer, so that you can thoroughly hide the implementation of a class for the customer.

LImplementation

NOne special case is that there is only oneImplementorClass, which isBridge.

NInvalid actionThere are three methods to createImplementor;

UInvalid actionKnow allConcreteimplementor,So you can createImplementor;

UInvalid actionCreate a defaultImplementorAnd then change the implementation as needed;

UIntroductionFactory,This wayInvalid actionYou do not need to know any specificImplementor. I recommend this method.

 

 

Figure1Typical Structure of the Bridge Mode

AboutP106Mentioned inSet, sorted set, hashsetAndHistory List, hashtableIn the book, it is a kind of degraded bridge. I can also say this is a kindAdapter, We can look at the comparison of the two class results, as shown in the figure2And Graph3. Through comparison, we can find that,P106The application only has more sub-class implementations, which is equivalent to multipleAdapter.

The author also said this to the team,BridgeAndAdapterIt is similar.

 

Figure2Typical Structure of the adapter Mode

 

figure 3 p106 application mentioned in