virtual dialer

1#include 2 using namespacestd;3 classbase{4 Public:5 voidm ()6 {7cout "it ' s Base ' s M ()"Endl;8 }9 Virtual voidf ()Ten { Onecout "It's Base ' s f ()"Endl; A } - }; - classSub: PublicBase the { - voidm () - { -cout "It's Sub ' s M ()"Endl; + } - voidf () + { Acout "It's Sub ' s f ()"Endl; at } - }; - voidMain () - { -base*Base=NewSub; - Base-f (); in Base-m (); -}The above is based on base cl

Virtual functions are defined in the base class in order to be rewritten and polymorphic, even if the definition is empty, so you can override or write this function in the base class in a subclass!Pure virtual functions are not defined in the base class and must be implemented in subclasses, much like the interface functions in Java!1. Dynamic bindingThe actual type of the referenced object is judged durin

A lot of virtual machine users cannot predict how much space they need after installing the system on the Virtual Machine. After using the system for a while, they find that the disk space of the virtual machine is insufficient. How to solve it? Method 1,Add a hard disk in the virtual machine configuration.Click Edit

History of virtual machines In today's computer world, the concept of virtual machines has been used to solve many problems. From machine segmentation (IBM model), to "semi platform independent" programming language (Java model), to the development of the operating system (UNIX model and OSI model), the concept of virtual machines has proven to be a powerful t

Since the work above, the program because the code more write more, become more and more bloated, the efficiency will become lower, so I always like to constantly optimize the program structure outside, memory optimization and performance tuning.To make memory optimizations and performance tuning for Java programs, you need to understand the internal principles of virtual machines and understand the benefits of Java

Part III Virtual machine execution subsystemChapter 6th class file StructureThe basis of language independence is still the virtual machine and bytecode storage format, using the Java compiler can compile Java code into a storage byte code class file, using JRuby and other languages such as the compiler can compile the program code into a class file, The virtual

Shared guard version 2.0 has added many features. The most important one is that it can provide automatic host switch. In order to ensure the implementation of the host switching function, the configuration is much more complicated than Version 1.0, especially when users use the fixed IP Mode of a single Nic, the concept of the virtual network card and the virtual gateway is not very clear, resulting in con

C ++ virtual inheritance, virtual inheritanceAnother name inherited by C ++ virtual is Diamond inheritance, which is mainly used to copy data members of the same name inherited from different classes in the memory, this causes data inconsistency and causes memory leakage during class release. The common base class is used as the

Examine the following code:classabstractbase{ Public: VirtualIBase () =0; VirtualInterface ()Const=0; Virtual Const Char*Member ()Const{return_member;} protected: Char*_member;}There is a problem with this code, although the class is abstract, but it still needs a constructor to initialize the _member.It may be felt that the Abstractbase designer tried to give each of its derived classes the initial value of _member. But if so, the only requ

C + + virtual function table parsing (GO)--writing really good, can't help turning http://blog.csdn.net/hairetz/article/details/4137000On the http://blog.csdn.net/hackbuteer1/article/details/7475622 of C + + polymorphismC + + abstract class http://www.cnblogs.com/dongsheng/p/3343939.htmlThe essence of C + +-virtual function http://blog.chinaunix.net/uid-26851094-id-3327323.htmlSummary of memory space occupi

1. Virtual function (impure virtual)The virtual function of C + + has the function of " runtime polymorphism ", which provides the implementation of virtual function in the parent class, and provides the default function implementation for subclasses .　　Subclasses can override the