目录1. UseCase 的用途2. UseCase 的特点2.1 不持有状态2.2 单一职责2.3 可有可无3. 如何定义 UseCase3.1 Optional or Mandatory？3.2 Class or Object？3.3 Class or Function？3.4 Function interface ?4. 总结1.
I noticed that there are two ways to create C++ objects: BTree *btree = new BTree; and BTree btree; From what I can tell, the only开发者_JS百科 difference is in how class objects are accessed (.
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