Virtual Tables:- The virtual table is a lookup table of functions used to resolve function calls in a dynamic or late binding manner. The virtual table is also called by other names, such as vtable or virtual function table, virtual method table or dispatch table. Every class that uses virtual functions or which is derived from a class that uses virtual functions is given its own virtual table. The vtable is a static array that the compiler sets up at compile time. A virtual table contains one entry for each virtual function that can be called by objects of the class. Each entry in this table is a function pointer that points to the most-derived function accessible by the class. The compiler also adds a hidden pointer to the base class, which will be *__vptr. *__vptr which is set automatically when a class instance is created so that it points to the virtual table for that class. The *this pointer, which is actually a function parameter used by the compiler to resolve self-references, *__vptr is a real pointer. Consequently, it makes each class object allocated bigger by the size of one pointer. It also means that *__vptr is inherited by derived classes. Virtual functions are most commonly implemented using virtual function tables, or vtables. Each class that declares at least one virtual function has a hidden data member (e.g., _ _vtbl). The _ _vtbl member points to an array of function pointers. Every derived class has a copy of the table. Every instance of a class…
A Realistic Yet Virtual World shows readers the importance of a virtual reality through the eyes of a disabled student. Disabled students are able to use virtual reality to improve their education and learning abilities. By learning through a virtual reality, disabled students are able to learn without the potential humiliation from peers. Also, students are able to learn at their own pace rather than the teachers pace. I partook in My Virtual Child, which is a virtual reality. In the program…
The Anthropology of Virtual Worlds
4 October 2012
People have been trying to define the meaning of virtual worlds for years. The definition of a virtual world, as defined by the “Journal of Virtual Worlds”, is a “computer-based simulated environment where users interact with other users through graphic or textual representations of themselves utilizing textual chat, voice, video or other forms of communication.” I agree with this definition of virtual worlds because it sums up…
Technology is forever changing. We have gone from having massive machines that occupied entire rooms to having devices that fit in the palm of our hands. Now, imagine tasting, smelling, touching, hearing and seeing other people, places, and things from anywhere in the world or imaging being a part of a simulated world that someone created. This can all be achieved through a technology referred to as virtual reality.
According to the Merriam-Webster Dictionary, virtual reality…
Reality of Virtual Reality
Computer Literacy 103
November 19, 2012
While many people believe virtual reality to be an entertainment feature, virtual reality is a feature that will one day shape many of our common industries in the world. From arts, communication, and architecture, to engineering, education, and the medical field, the advancements virtual reality is taking in these professions is vital to their progression in the future. Virtual reality can…
Virtual Private Network IS 311 Dr. Gray Tuesday 7pm November 19, 2002 By Germaine Bacon Lizzi Beduya Jun Mitsuoka Betty Huang Juliet Polintan Table of Contents Introduction .. 1 - 2 VPN Topology... 2 - 3 Types of VPNs... 3 - 5 Components of VPNs. 5 - 7 Productivity and Cost Benefit.... 7 - 9 Quality of Service.. 9 The Future of VPN.... 9 - 11 Conclusion. 11 Bibliography...12 - 13 Questions14 Introduction Virtual. Virtual means not real or in a different state of being. In a VPN, private communication…
Component/s:Framework agents process
In some cases, documents that are indexed may be virtual children of those that are queued. A good example of this is RSS feeds where the data being indexed all comes from the feed.
In order to implement this, the following changes would be required:
(1) IProcessActivity.ingestDocument() has a variant which allows you to include a virtual child document identifier in addition to the main document identifier.
(2) IIncrementalIngester's addOrReplaceDocument…
Virtual reality development has really slowed in recent years and recent progress is not exactly recent. This is more than likely due to public disappointment, further due to the high expectations created by media sensation. I must admit though, since I was a child Virtual Reality has transformed incredibly.
Virtual Reality is a term that applies to computer simulated environments that can simulate physical presence in places in the real world, as well as imaginary worlds. Virtual Reality provides…
What will become of bitcoins?
Problems at the Tokyo-based Mt. Gox bitcoin exchange, once the world’s largest, have come to a head, leaving the virtual currency and peer-to-peer payment system in a state of flux and threatening to undermine much of the acceptance bitcoins have garnered over the past year or so. The Mt. Gox Web site has been shut down, and the organization’s Twitter feed has been cleared amid reports that the exchange was hacked, resulting in the theft of hundreds of thousands…
I believe the author is against someone being punished in the real world for a virtual crime. He states that no one should be penalized for the difference of the conflict about real and virtual law conflicts. Personally I play video games often and I consider it a virtual world, as do most people that engage in video games. I feel like people expect to do things unlike you would do in real life because when logged onto a game you are logging into your pretend, virtual life.…
running head: VIRTUAL MEMORY MANAGER
Assignment #4: Virtual memory manager
Dr. Romy Lu
Saturday, August 31, 2013
Most operating systems use a virtual memory manager (VMM) whose responsibility is to manage the relationship between the virtual organization of memory as seen by an application with the physical organization of memory from the operating system’s point of view. Virtual memory addresses must be mapped to physical address and vice…