OOP: An Overview【c++ primer】
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Inheritance :
Inheritance lets us define classes that model relationships among types, sharing what is common and
specializing only that which is inherently different.
那么derived class 就有两种选择,1 。 和base class 有一样的opration 2 。与base class 不一样的,可以自己redefine 的opration。 对于derived class ,它可以redefine 的opration 是被base class 标志为virtual 的operation。
Dynamic Binding :
Dynamic binding lets us write programs that use objects of any type in an inheritance hierarchy without caring about the objects' specific types 。
In C++, dynamic binding happens when a virtual function is called hrough a reference (or a pointer) to a base class. The fact that a reference (or pointer) might refer to either a base- or a derivedclass object is the key to dynamic binding. Calls to virtual functions made through a reference (or pointer) are resolved at run time: The function that is called is the one defined by the actual type of the object to which the reference (or pointer) refers.
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