So far, we have only created our builders, which are equivalent to the classic Factory method pattern. However, we haven't seen the Factory part of the Dynamic Factory. Let's look at how the Mach5 Engine implements the StageFactory class:
class M5StageFactory { public: ~M5StageFactory(void); void AddBuilder(M5StageTypes name, M5StageBuilder* builder); void RemoveBuilder(M5StageTypes type); void ClearBuilders(void); M5Stage* Build(M5StageTypes name); private: typedef std::unordered_map<M5StageTypes, M5StageBuilder*> BuilderMap; typedef BuilderMap::iterator MapItor; BuilderMap m_builderMap; };
As you can see, M5StageFactory isn't a very complicated class. Once you understand the design behind the patterns, ...
