base class

基本解釋

The second way to differentiate your new class is to change the behavior of an existing base-class function.
第二種區(qū)分新類的方法就是去改變基類的已存在的行為（處理方法）。
There's a certain debate that can occur about inheritance: Should inheritance override only base-class functions ?
有一些特定的討論是針對(duì)繼承的：是否繼承覆蓋僅僅是基類的方法？
When we construct, copy, assign, or destroy an object of derived type, we also construct, copy, assign, or destroy those base-class subobjects.
當(dāng)構(gòu)造、拷貝、賦值或撤銷一個(gè)派生類對(duì)象時(shí)，也要構(gòu)造、拷貝、賦值或撤銷那些基類的子對(duì)象。

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