once we've made those changes, which option should be used to model this 「is implemented in terms of 」relationship - private inheritance or membership?the answer is pretty easy to remember.
一旦我们完成这些清理工作,马上有一个选择题摆在了我们面前:应该使用什么样的类关系塑造「根据某物实现」——私有继承还是成员关系?