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继承-Dream-51CTO博客
source link: http://blog.51cto.com/12951882/2069947
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继承是面向对象复用的重要手段。通过继承定义一个类，继承是类型之间的关系建模，共享公有的东西，实现各自本质不同的东西。三种继承关系：public、protected、private三种继承关系下基类成员在派生类的访问关系变化。public继承：基类的public成员仍为public成员、基类的protected仍为protected成员、基类的private成员不可见。protected继承：基类的
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