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Regarding this mechanism, we call it as polymorphism, and u should use virtual
function to implement such kind of function by using virtual identifier.
关于推文提到的 pure virtual function 就是在后面补个=0
The class which have a pure virtual function at least one but not all ,we call
it as abstract.
If the class only have pure virtual functions, we think it a interface.
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不用谢，装逼是我的兴趣