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Topic: Derived Object

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	3.5 DERIVED OBJECT CODES (Site not responding. Last check: 2007-10-08)
		Object codes for automatic payments from data base appointments are derived during the data base update, and so are not discussed here.
		Object code override values for payroll transactions will be derived based on the rules specified in the earnings table.
		Object code overrides are controlled by the earnings type table.
	www.cu.edu /pubs/payroll/manual3/5object.html (559 words)

	Class Object (Site not responding. Last check: 2007-10-08)
		An object is one of two things: A procedural object or a derived object.
		Derived objects are part of the system and may not be created by plug-ins.
		Normally an object does not (and should not) be concerned with this, but in certain cases like particle systems an object is effectively a world space object an needs to be notified.
	sparks.discreet.com /knowledgebase/webhelp/html/idx_R_class_object.htm (5245 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		If we set up an array of base class object references, we can initialize that array with any combination of base and derived class objects; then, all other application code does not have to be tightly coupled to individual concrete classes, it can be loosely coupled to an abstract interface.
		Since arrays are themselves objects in Java, this is natural enough, but the test that is performed actually checks two things: first it will check if the object is an array, then it checks if the element type of that array is some subclass of the element type of the right-hand operand.
		Objects are not guaranteed to be garbage-collected at all...
	home.earthlink.net /~huston2/java/inheritancedemos.html (2488 words)

	Stan Lippman's BLog : Making a Virtual Table Context-Sensitive
		Under the CLR object model, the embryonic derived object is always treated as an instance of its class within each base class constructor; therefore, any virtual function invocations within the call chain initiated within the base class constructor resolves to the derived class instance.
		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.
		The Derived constructor is invoked subsequent to the completion of the Base constructor, and completes the initialization of the Derived class object allocated in the first line of main().
	blogs.msdn.com /slippman/archive/2004/01/30/65056.aspx (1309 words)

	Teach Yourself C++ in 21 Days
		When a derived class creates a function with the same return type and signature as a member function in the base class, but with a new implementation, it is said to be overriding that method.
		It is legal and common to pass a pointer to a derived object when a pointer to a base object is expected.
		As derivation continues, derived classes inherit the sum of all the functions and data in all their base classes.
	www.csun.edu /~ek3803/htm/ch12.htm (4162 words)

	GotW #23: Object Lifetimes - Part II
		Construction and destruction are not meant to be used to change an object's value (and in fact they do not; they actually destroy the old object and replace it with a lookalike that happens to carry the new value, which is not the same thing at all).
		In particular, any derived class that takes responsibility for its base class' state could fail if its base parts are modified without its knowledge (and invisibly destroying and reconstructing an object certainly counts as modification).
		There are other potential hazards that can affect client code and/or derived classes (such as behaviour in the presence of virtual assignment operators, which are always a bit tricky at the best of times), but this should be enough to demonstrate that the idiom has some serious problems.
	www.gotw.ca /gotw/023.htm (1939 words)

	KwikPeg On-line Reference
		object is created as follows, the string assigned to the object is a string literal.
		When another class is derived from it, the style passed to a derived class constructor is forwarded to the
		Text copy mode must be enabled if any string assigned to the object is located in temporary storage such as a local variable on the stack.
	www.kadak.com /manual/kwikpeg/kpg_ref/prgguide/ptxtthng.htm (791 words)

	Derived Types (Site not responding. Last check: 2007-10-08)
		The size of a sequence derived type is equal to the number of bytes of storage needed to hold all of the components of that derived type.
		The size of a sequence derived type declared using a standard derived type declaration is equal to the sum of the number of bytes required to hold all of its components.
		If a derived type is accessible in a scoping unit and there is a local entity of class 1 that is not a derived type with the same name accessible in the scoping unit, the structure constructor for that type cannot be used in that scope.
	kiwi.atmos.colostate.edu:16080 /tidbits/xlf/pgs/lr27.htm (4722 words)

	ANSI/ISO C++ Professional Programmer's Handbook - Chapter 5 - Object-Oriented Programming and Design (Site not responding. Last check: 2007-10-08)
		Many objects of various kinds share a similar characterization: They must be acquired by means of initialization prior to their usage; then they can be used, and then they have to be released explicitly.
		Derivation simplifies class structure and localizes the changes that are associated with a specific language to its corresponding class without affecting others.
		Likewise, its destructor is responsible for invoking the embedded object's destructor.
	www-f9.ijs.si /~matevz/docs/C++/ansi_cpp_progr_handbook/ch05/ch05.htm (7059 words)

	HP aC++ Keywords (Site not responding. Last check: 2007-10-08)
		An example of this is use or reference count in an object that keeps track of the number of pointers referring to it.
		If a type, function, or object is declared inside of a namespace, then using that entity will require naming this namespace in some explicit or implicit way; even if the use happens in another translation unit (or source file).
		Objects that are hardware addresses or those used by concurrently executing pieces of code are frequently declared volatile.
	docs.hp.com /en/B3901-90015/ch06s01.html (2278 words)

	LinuxDevCenter.com: C++ Memory Management: From Fear to Triumph
		Otherwise, the derived class' destructor may not be called in circumstances such as the one shown in the example.
		As you index into an array of derived objects via a base-type pointer, the compiler is happily doing the pointer arithmetic using the size of the base class.
		Copying is always based on the static type of the object, so if you have a base-type reference to an object of a derived class, and you decide to throw that reference, an object of the base type will be thrown.
	www.linuxdevcenter.com /pub/a/linux/2003/05/08/cpp_mm-1.html?page=3 (2589 words)

	KwikPeg On-line Reference
		derived object may have to be added to an object which does not own viewports.
		object can then be added to (removed from) any other object, effectively adding (removing) the entire group of objects.
		object, thereby permitting the object to be a viewport owner.
	www.kadak.com /manual/kwikpeg/kpg_ref/prgguide/kppg0160.htm (380 words)

	Eric J. Ostrander's Clearteam page. (Site not responding. Last check: 2007-10-08)
		The dependency checking that occurs to determine if an object can be winked into another view does not take into account other vital factors, such as the operating system that originally build the object.
		For example, if an object is built on Solaris and a subsequent build of the identical source files is conducted on HP, clearmake could errantly winkin the DO.
		New in CC 4.0, one has the ability to create derived objects that cannot be shared (winked-in) by any other view.
	members.cox.net /ejostrander/clearteam/cc_howto_DO.html (1854 words)

	The Old New Thing : What is __purecall?
		The object is destructed in pieces, and a call to a virtual function invokes the function corresponding to the stage of destruction currently in progress.
		This would happen if A were a fully constructed object and B were a partially-constructed object on its way to becoming a derived object.
		The object is fully-formed by the time the code in the post-constructor runs, and virtual functions resolve to the most-derived implementation.
	blogs.msdn.com /oldnewthing/archive/2004/04/28/122037.aspx (3565 words)

	[No title]
		The base class object and derived class object respond to the same message, but in somewhat different ways, determined by the implementations of the virtual function in each class.
		The display list is said to contain a heterogeneous collection of objects since any one of the graphicsObject types can occur on the list in any order. The list manager needs to be able to apply one of several specific operations, like draw() or hide(), to every mem-ber of the list.
		We say that the display list object dispatches the virtual function draw() Polymorphism places the responsibility for choosing the implementation to call with the object, not with the caller. Allowing different objects (which must be type compatible) to respond to a common message with behaviors suited to the object is a powerful design mechanism.
	www.ecs.syr.edu /faculty/fawcett/handouts/CSE687/Sp2002/Lecture9/HIER.PPT (856 words)

	Without a title - Title
		Derived classes are supersets of their base classes.
		Because objects with virtual methods must maintain a v-table, there is some overhead in having virtual methods.
		If you have a very small class from which you do not expect to derive other classes, there may be no reason to have any virtual methods at all.
	www.mathsci.appstate.edu /~dap/tutorial/ch12.htm (4162 words)

	Untitled Document
		However, base class pointers and derived objects are the exceptions to this rule.
		You cannot access an object of the nase type by using a pointer to a derived class.
		Therefore, when a base class pointer is pointing at a derived object, incrementing or decrementing it will not make it point to the next object of the derived class.
	www.uncp.edu /home/hwangd/csc275Spring02/csc275LectureNotesSpring2002/csc275chap14Apr162002.htm (472 words)

	[No title]
		It is related to the other service objects and is the means by which these service objects become associated with the access resources.
		It is a class of managed objects representing the characteristics of the Directory Number(s) (DN)[C2] assigned to an individual subscriber, independent of the access type and bearer service.
		However, this object affects the behaviour of the object instances that are contained in (named by) instances of this class.
	www.itu.int /ITU-T/formal-language/gdmo/database/itu-t/q/q824.0/1995/q824.0.gdm (3592 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		Basically all the IFOO vtable for "Derived" contains is a pointer to %Base.foo.
		Consider the cast from Derived to IFOO: public override void bar(float F) { IFOO IF = this; I represent interface references as pairs, where there first element is a pointer to the object (void*) and the second is a pointer to the interface vtable.
		When casting from an interface to a derived object, you just go to the object pointer, load the OBJECT'S vtable pointer, and do a normal dynamic cast from System.Object to whatever derived class you want.
	www.nondot.org /sabre/LLVMNotes/MSILObjectModel2.txt (348 words)

	[No title]
		Protected members are available to their own class and to derived classes, but not to the client.
		Derivation Type Base Class Member Access in Derived Class private private inaccessible public private protected private public private inaccessible public public protected protected protected private inaccessible public protected protected protected Inheritance When a derived object is created, it constructor is called to initialize its data.
		Destructors are automatically generated if the derived class does not have a destructor.
	www.cod.edu /people/faculty/vethka/Cis241/CHAP15.doc (830 words)

	ipedia.com: Rational ClearCase Article (Site not responding. Last check: 2007-10-08)
		Build Avoidance: Use of MVFS (Multiversion File System) allows derived objects built in one dynamic view to be automatically "copied over" to another dynamic view requiring "exactly the same" derived object.
		Two derived objects are deemed to be "exactly same" if they have the same configuration record (ClearCase terminology, also called bill of materials).
		Shared derived objects will be physically present on the VOB server, and not in the views that reference them.
	www.ipedia.com /rational_clearcase.html (591 words)

	Inheritance 1
		Inheritance is a technique that allows one class to be derived from another.
		Although the derived class inherits all the methods from the base class, it is still possible to create a method in the derived class with the same signature as one in the base.
		The derived class version will override the base class version, when called through an object of type Rectangle.
	www.cs.fsu.edu /~myers/cis3931/notes/inher1.html (802 words)

	[No title]
		Use of an initialization sequence is the only way to chose which constructor will be called for base classes and set member reference values.We will see in the demonstration code that this is critically important.
		The display list is said to contain a heterogeneous collection of objects since any one of the graphicsObject types can occur on the list in any order. The list manager needs to be able to apply one of several specific operations, like draw() or hide(), to every member of the list.
		However, draw() and hide() processing will be different for each object. Languages which support object oriented design provide a mechanism called polymorphism to handle this situation.
	www.ecs.syr.edu /faculty/fawcett/handouts/CSE687/Presentations/HIER.PPT (840 words)

	CodeGuru Forums - pointers to classes
		Try using sizeof with the derived object and it will return TOTAL bytes used by the class object.
		Now if we declare object of type B, its size would be 12 (assuming, 32-bit integer), despite the fact that we cannot access A::a.
		Furthermore, I said to sizeof on object and not on pointer.
	www.codeguru.com /forum/archive/index.php/t-318419.html (304 words)

	QuEP 11: ObjectHandler
		Objects created in one area of the application can be accessed in another - for example, in a spreadsheet, one sheet can refer to objects instantiated on another.
		It may be convenient to contain all calls to ObjectHandler in an interface layer, particularly where the Client application is a procedural environment such as a spreadsheet.
		The goal is distributed computing: a spreadsheet instantiates an object, but instead of being priced locally, the Object is serialized, transmitted to the grid, priced there, and the result sent back to the client.
	quantlib.org /quep/quep011.html (1181 words)

	Object Class (Site not responding. Last check: 2007-10-08)
		Because all classes in the.NET Framework are derived from Object, every method defined in the Object class is available in all objects in the system.
		Finalize — Performs cleanup operations before an object is automatically reclaimed.
		GetHashCode — Generates a number corresponding to the value of the object to support the use of a hash table.
	authors.aspalliance.com /aspxtreme/sys/objectclass.aspx (151 words)

	System Architect Definitions, Encyclopedia:"C:\EC\SQUID\SA_ENC\" (Site not responding. Last check: 2007-10-08)
		When 5 or more past portions are available, the algorithm will calculate upper and lower bounds on the estimate from the variation attribute observed on the past portion.
		This reduced table is the one used for further processing and the selection will have included an order by project object type and then by attribute name.
		If a development model does exist then a selction is made on the data_str database to select only those attribute unit pairs for which both a target and estimate value or values exist.
	valse.eng.it /defns.htm (3832 words)

	derived object - a Whatis.com definition (Site not responding. Last check: 2007-10-08)
		A derived object (DO) is a file created in a Versioned Object Base (VOB).
		The file is created automatically, and records the result of a particular action during the building or maintenance of a program in a software configuration management (SCM) environment.
		In ClearCase, each derived object has a configuration record (CR) that describes the build environment, and also describes the build history for the program under development.
	whatis.techtarget.com /gDefinition/0,294236,sid44_gci960249,00.html (142 words)

	PObject Declaration/Implementation Macros
		This consists of providing access to a PClassInfo structure which includes the name of the class (as a text) and the size of an object.
		Additionally, the IsKindOf capability (which checks an object and its ancestors for a desired type) and the GetType and GetTypeDepth services are implemented at this level.
		While this does not immediately seem earth shattering, it can be useful when base class code wishes to replicate a derived object which it can, in its nature as a base class, have no knowledge of.
	www.grc.nasa.gov /WWW/price000/pfc/htm/pobject_macros.html (693 words)

	[No title]
		Friends Friend functions override the data hiding methods of C++ & can freely access any member (public, protected or private) of the class which has declared it to be its friend.
		Simply extract the common parts to form another class, and allow it to be inherited by the other classes.
		Organization of objects into hierarchies — Form groups of objects that have an “is-a-kind-of” relationship.
	www.ccs.neu.edu /home/bijoyini/lecture/Lecture4_bij.doc (386 words)

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