When inheriting a virtual class, be careful when instantiating it. You must make it fully real and override the pure virtual method... Class Definition location

 

Http://stackoverflow.com/questions/7352706/cannot-allocate-an-object-of-abstract-type-error

In C ++ a class with at least one pure virtual function is calledAbstract classAnd you cannot create objects of that class, you can only have pointers or references to it.

If you are deriving from an abstract class make sure you override and define all pure virtual functions for your class.

 

 

It is because an error is written in a pure virtual method in the inherited base class. The final error is too exaggerated...

 

It is reported that a pure virtual class cannot be instantiated .....

 

In addition, different classes are used to store different files. Otherwise, the relationship between classes and classes is very important.

You can use include to solve the problem of file inclusion ....