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Topic: Virtual table


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In the News (Tue 29 Dec 09)

  
  Virtual method table - Wikipedia, the free encyclopedia
A virtual method table, virtual function table, dispatch table, or vtable, is a mechanism used in programming languages to support dynamic polymorphism, i.e., run-time method binding.
The dispatch table is the same for all objects belonging to the same class, and is therefore typically shared between them.
Note that a virtual call requires at least an extra indexed dereference, and sometimes a "fixup" addition, compared to a non-virtual call, which is simply a jump to a compiled-in pointer.
en.wikipedia.org /wiki/Virtual_table   (953 words)

  
 Virtual function - Wikipedia, the free encyclopedia
A virtual function or virtual method is an important part of the polymorphism portion of object-oriented programming (OOP).
A virtual function allows a derived class to override functions in classes it inherits from – even when the derived class is cast as the type of object from which it inherits.
Pure virtual functions are also used where the method declarations are being used to define an interface for which derived classes will supply all implementations.
en.wikipedia.org /wiki/Virtual_functions   (740 words)

  
 virtual(5): Postfix virtual alias table format - Linux man page
Virtual aliasing is recursive, and is implemented by the Postfix cleanup(8) daemon before mail is queued.
Virtual alias domains are not to be confused with the virtual mailbox domains that are implemented with the Postfix virtual(8) mail delivery agent.
Normally, the virtual(5) alias table is specified as a text file that serves as input to the postmap(1) command.
www.die.net /doc/linux/man/man5/virtual.5.html   (1157 words)

  
 Virtual Functions in C++   (Site not responding. Last check: 2007-10-31)
At the time when a virtual function is called on an object, the vptr of that object provides the base address of the virtual table for that class in memory.
A constructor cannot be virtual because at the time when the constructor is invoked the virtual table would not be available in the memory.
Virtual methods should be used judiciously as they are slow due to the overhead involved in searching the virtual table.
www.codersource.net /published/view/325/virtual_functions_in.aspx   (810 words)

  
 SQLite CVSTrac
The virtual table mechanism allows an application to publish interfaces that are accessible from SQL statements as if they were tables.
The arguments are passed as written (as text) into a constructor for the virtual table when the virtual table is created and the constructor is responsible for parsing and interpreting the arguments.
Virtual table implementations that are built as loadable extensions for SQLite version 3.3.7 and earlier will need to be recompiled in order to work with SQLite versions 3.3.8 and later.
www.sqlite.org /cvstrac/wiki?p=VirtualTables   (1227 words)

  
 Adding A Work Table - The Virtual Weber Bullet
The work table can only be installed when the middle cooking section is inserted into the charcoal bowl, and you cannot remove the middle cooking section when the table is installed because the tubular brace connects to one of the legs.
This method of installation does not allow you to leave the table installed at all times--you install the table after the fuel is in the cooker and remove it before emptying the ashes from the charcoal bowl.
To attach the work table to the cooker, simply connect the brace to the support bracket using the hitch pin, hang the bracket from the edge of the cooking section and fasten the other end of the brace to the turn button.
www.virtualweberbullet.com /worktable.html   (1105 words)

  
 Virtual Tree and Table in SWT
Virtual Tables and Trees allow developers to quickly create Tables and Trees with large amounts of data and populate them efficiently.
However, a virtual table should perform well here since the initial population time would just be the time required to create the first page of items.
Virtual Trees are used in a very similar manner to virtual Tables, but with the added facet of child items.
www.eclipse.org /articles/Article-SWT-Virtual/Virtual-in-SWT.html   (1525 words)

  
 Postfix manual - virtual(5)
TABLE FORMAT The input format for the postmap(1) command is as follows: pattern result When pattern matches a mail address, replace it by the corresponding result.
Virtual alias domains are not to be confused with the vir- tual mailbox domains that are implemented with the Postfix virtual(8) mail delivery agent.
Instead of specifying the virtual alias domain name via the virtual_alias_maps table, you may also specify it via the main.cf virtual_alias_domains configuration parameter.
www.postfix.org /virtual.5.html   (1287 words)

  
 2.15. Virtual Table Declaration
BIR virtual tables are used to model dynamic dispatch of methods in OOP language or type-safe function pointers.
The namespace for virtual tables is the global namespace that is shared with constants, enumerations, records, extensions, type-aliases, threads and functions, and functional expressions.
An enumeration-based virtual table is similar to the records-based, except that an enumeration type is used instead of record types.
bogor.projects.cis.ksu.edu /manual/ch02s15.html   (207 words)

  
 The Virtual Function Mechanism
Whenever a class declares a virtual function or is derived directly or indirectly from a class which declares a virtual function, the complier adds an extra hidden member variable which points to the virtual table.
A virtual table is nothing but an array of pointers to the virtual functions.
The entries in the virtual table are changed at run time to point to the correct function.
members.tripod.com /~s_mathur/Virt.html   (382 words)

  
 Stan Lippman's BLog : Making a Virtual Table Context-Sensitive   (Site not responding. Last check: 2007-10-31)
and pointed out that were the derived instance of the virtual function to access a state member or resource of the derived class object, the results would be undefined since the derived class object’s state members and resources have yet to be constructed.
There are two problem cases to solve: (1) the direct invocation of a virtual function within the constructor [easy], and (2) the indirect invocation of a virtual function through an arbitrary call chain [hard].
Again, the purpose of this is to reassign the active virtual table for virtual method resolution within the execution of each base class constructor.
blogs.msdn.com /slippman/archive/2004/01/30/65056.aspx   (1300 words)

  
 SQLite Virtual Machine Opcodes
When the virtual machine halts, all memory that it allocated is released and all database cursors it may have had open are closed.
P1 is a cursor on a table that declared as an index.
P3 is a pointer to a virtual table object, an sqlite3_vtab structure.
www.sqlite.org /opcode.html   (8738 words)

  
 VIRTUAL
Virtual aliasing is recursive, and is done by the Postfix cleanup(8) daemon.
Normally, the virtual alias table is specified as a text file that serves as input to the postmap(1) command.
With a virtual alias domain, the Postfix SMTP server accepts mail for known-user@virtual-alias.domain, and rejects mail for unknown-user@virtual-alias.domain as undeliverable.
www.linuxmanpages.com /man5/virtual.5.php   (1138 words)

  
 SWT - Virtual Tables Tutorial
Tables which are not "Virtual" contain n items, each with their own distinct TableItem Object from Table initialization.
Virtual tables are populated via a callback method dressed up as a Listener.
Virtual tables are a powerful and easy to use feature to add to your SWT toolbox.
publicobject.com /glazedlists/documentation/swt_virtual_tables.html   (1336 words)

  
 Virtual Configuration Register   (Site not responding. Last check: 2007-10-31)
Table D-1 lists the meaning of each of the virtual configuration memory bits.
Table D-4 shows the combined effect of bits 10 and 14.
Table D-5 shows the bit settings for the four available baud rates.
www.cisco.com /univercd/cc/td/doc/product/iaabu/distrdir/dd4700m/vconfig.htm   (1264 words)

  
 Java Virtual Machine's Internal Architecture
In the Java virtual machine specification, the behavior of a virtual machine instance is described in terms of subsystems, memory areas, data types, and instructions.
A method table is an array of direct references to all the instance methods that may be invoked on a class instance, including instance methods inherited from superclasses.
When the adaptive optimizing virtual machine decides that a particular method is in the hot spot, it fires off a background thread that compiles those bytecodes to native and heavily optimizes the native code.
www.artima.com /insidejvm/ed2/jvmP.html   (17347 words)

  
 Augmented Virtual Table Tennis with Real Racquets
In AR applications, virtual objects are superimposed on the user’s view of the real world, which is displayed, for example, through a computer monitor or HMD devices.
In another case, a virtual reality (VR) table tennis game has been implemented over a computer network, but it does not involve video image augmenting and is based on the traditional mouse interface.
When the racquet’s location meets the virtual ball within given distance, a hit is registered, the new ball trajectory is computed, and the ball parameters (time of impact, new trajectory) are sent via multicast address to the other player.
www.ercim.org /publication/Ercim_News/enw52/woodward.html   (970 words)

  
 Virtual Configuration Register
Table B-1 lists the meaning of each of the virtual configuration memory bits and Table B-2 defines the boot field names.
Table B-4 shows the combined effect of bits 10 and 14.
Table B-5 shows the bit settings for the four available baud rates.
www.cisco.com /univercd/cc/td/doc/product/access/acs_fix/cis2500/2505/2500him/77108.htm   (1470 words)

  
 Roulette Table Layout @ Virtual-Roulette.Net : Online Roulette Portal
As you'll learn in the roulette bets section, when you bet on a number, you're basically betting that when the wheel is spun and the ball finishes its bounce, that it will come to its final rest on the number that you'd bet on.
In the diagram above, the side and the end of the table that has the thick gray border is the section that's fully dedicated to the players.
The end of the table is the dealer or croupier domain and only he/she may enter there.
www.virtual-roulette.net /roulette_table_layout.html   (360 words)

  
 man: virtual
The optional virtual alias table specifies address aliasing for arbi- trary local or non-local recipient addresses.
The input format for the postmap(1) command is as follows: pattern result When pattern matches a mail address, replace it by the corre- sponding result.
Instead of specifying the virtual alias domain name via the vir- tual_alias_maps table, you may also specify it via the main.cf vir- tual_alias_domains configuration parameter.
www.hmug.org /man/5/virtual.php   (1183 words)

  
 Chemistry: WebElements Periodic Table
The periodic "law" of chemistry recognises that properties of the chemical elements are periodic functions of their atomic number (that is, the number of protons within the element's atomic nucleus).
The periodic table is an arrangement of the chemical elements ordered by atomic number in columns (groups) and rows (periods) presented so as to emphasize their periodic properties.
The relative merits of various other periodic table organisations is still the subject of debate.
www.webelements.com /webelements/index.html   (341 words)

  
 IBM developerWorks: DB2: Informix: DataBlade Developers' Corner: Virtual tables   (Site not responding. Last check: 2007-10-31)
The Virtual Table Interface is an extension to the DataBladeAPI that allows you to develop a "primary access method".With a primary access method, you can create a "virtual table"that allows you to access information stored external to the Informixdatabase server as if it were part of the database.
Virtual Table Interface (VTI) Overview takes you through the process of developing a primary access method using the Virtual Table Interface.
The Virtual Table Interface (VTI) Demos presents two complete examples that you can download and install on your system.
www-128.ibm.com /developerworks/db2/zones/informix/db_virtualtable.html   (129 words)

  
 [No title]
# # Normally, the virtual table is specified as a text file # that serves as input to the postmap(1) command.
# # TABLE FORMAT # The format of the virtual table is as follows, mappings # being tried in the order as listed in this manual page: # # pattern result # When pattern matches a mail address, replace it by # the corresponding result.
An unmatched address extension (+foo) is propa- # gated to the result of table lookup.
web.mit.edu /glasser/Public/postfix/virtual   (1205 words)

  
 missing virtual table   (Site not responding. Last check: 2007-10-31)
Is this a compiler bug?" (On platforms that run neither collect nor the GNU linker, like Solaris, you may see an odd undefined symbol like "_vt.3foo", where foo is a class name).
This is probably because you are missing a definition for the first (non-inline) virtual function of the class.
Since gcc-2.7.0, g++ uses a trick borrowed from cfront: the.o file containing the definition for the first non-inline virtual function for the class will also contain the virtual function table.
docs.freebsd.org /info/g++FAQ/g++FAQ.info.missing_virtual_table.html   (97 words)

  
 Christmas Table — Virtual Finland
It is a time for the family, close relatives, friends without family, but above all for the children.
The good old traditional dishes appear on the Christmas dining table year after year.
NOTE: The almond is believed to bring good luck to the one round the table who happens to get it.
virtual.finland.fi /finfo/english/joulreng.html   (1740 words)

  
 Virtual Table Interface (VTI) Overview
VTI (Virtual Table Interface) was developed to provide a consistent method for developing gateways to data that is not stored in Informix tables.
Without going into excruciating detail, the goal will be to explain what the server does when it encounters a request to perform an operation on a "virtual table", and what the developer needs to do to allow the server to access the external data that the "virtual table" represents.
If the data associated with a virtual table is completely external to the database, i.e., if it is in an extspace, then it is not possible for the server to provide logging and recovery services for it.
www-128.ibm.com /developerworks/db2/zones/informix/library/techarticle/db_vti.html   (3711 words)

  
 What's a Virtual Light Table?   (Site not responding. Last check: 2007-10-31)
Since my light table is virtual (computer jargon for something simulated in software), the background is fl instead of the normal glaring white.
Using a real light table often means squinting at slides through a magnifier.
On pages that are menus (such as the Virtual Light Table home page or the Photo Travel Essay page), the pictures are samples that link to another page or section.
www.tedsimages.com /text/ltable.htm   (350 words)

  
 Virtual Table Model
At the end of this process, we get a Virtual Table Model Bean, which collects the data for the selected columnar data.
Virtual Table Model has a feature of combining more than one table from agent and showing it as a single JTable User Interface.
This means for the columns to be added in the VTM you have to ensure that it has equal number of rows.
www.adventnet.com /products/webnms/StudioTools/ClientBuilder/help/configuration_wizard/using_custom_nodes/virtual_table_model.html   (305 words)

  
 Introduction to the Virtual User Table
The solution is to use a Virtual User Table, or virtusertable.
All of our packages allow you to add as many entries into your virtual user table as you like.
You can also add a special type of virtual user known as a catchall, as explained in the Using a Catchall section of this guide.
support.interland.com /freedom/guide/virtusertable.htm   (331 words)

  
 Research Network Forum, Virtual Table/s Site   (Site not responding. Last check: 2007-10-31)
One format that has been used consistently is to have 15-18 tables as separate, simultaneous cacuses in a large room.
At each table, there are 4-5 researchers with several other people taking turns discussing their specific projects.
Visit the sample virtual table on "Theory in the Classroom" and join in on the discussion.
www.uta.edu /english/V/rnftable.html   (497 words)

  
 Using Transparent Props For Interaction With The Virtual Table - Schmalstieg, ao, Szalav'ari (ResearchIndex)   (Site not responding. Last check: 2007-10-31)
This paper reports on a user interface and new interaction techniques for the Virtual Table based on transparent props---a tracked hand-held pen and a pad.
These props, but in particular the pad, are augmented with 3D graphics from the Virtual Table's display.
13.4%: A Translucent Sketchpad for the Virtual Table..
citeseer.ist.psu.edu /318296.html   (596 words)

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