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C ++ pure virtual function virtual = 0 Reference: http://hi.baidu.com/cunlin/blog/item/d82b160102e0e4037aec2ccb.html (Baidu space) ========================================================== ====================================== Pure virtual functions in C ++ A function declaration in C ++ is called a pure

First, The core idea of object-oriented programming (Object-oriented programming) is data abstraction, inheritance, dynamic binding . With data abstraction, you can decouple the interface of a class from implementation, use inheritance, and make it easier to define new classes that are similar but not identical to other classes, using dynamic binding, to some extent ignoring the differences of similar classes, and using their objects in a uniform way. The function of

1. Introduction Virtual functions are the mechanisms used in C + + to implement polymorphism (polymorphism). The core idea is to access the function defined by the derived class through the base class. Let's say we have the following class hierarchy: Class A { Public virtual void foo () {cout }; Class B:public A { Public virtual void foo () {cout }; So, in

Preparatory work1. VS2012 use command line options to view the memory layout of an objectMicrosoft Visual Studio provides the option for users to display the layout of C + + objects in memory:/d1reportsingleclasslayout. It's easy to use, just click on the "Visual properties " button under the [Project P] option. Switch to the CPP file in the directory where you can enter the following commandC1 [Filename].cpp /d1reportsingleclasslayout[classname]Where [Filename].cpp is the CPP file where the cl

This article mainly tests the class size, including empty classes, static and non-static variables, virtual and non-virtual single inheritance and multi-inheritance classes, and class or object Test whether the virtual table and virtual pointer are the same, and give a simple explanation. If there is anything inapprop

If there is no virtual function virtual inheritance is only a nightmare, then this is the real purgatory. The most complex inheritance level in C + + in the implementation of the VS actually I do not fully understand, some of the hard-hitting also calculate the Microsoft implementation method, as for some tricky way to realize I also can not think of any reason to explain it, but also only know its why not

Directory: http://www.cnblogs.com/WuCountry/archive/2008/11/15/1333960.html[Do not provide illustrations. You are advised to download the source book from the Internet] 5.9. Virtual Devices Virtual DeviceA virtual device is an internal action built on top of one or more real devices. the association between virtual d

The memory size calculation of the class in the case of virtual inheritanceWhen there are multiple virtual functions in each base class, and in the case of virtual inheritance, how the memory is allocated and how the class size is computed, the following example illustrates:#include using namespace Std;Class A{Publicint A;vir