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Topic: Multiple dispatch

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	Dispatch Automated Publishing Solutions: Frequently Asked Questions
		Dispatch Publisher was created to fill all those needs, and became much more in the process.
		Dispatch obviously does that as well, but with a lot more finesse, grace, and focus on the value of archived content.
		Dispatch allows you to fully experience that value by leveraging all content, be it new or archived.
	dispatch.net /public/faq.html (1993 words)

	Charming Python: Multiple dispatch
		When a function is called from the dispatcher, it is passed the arguments used in the call to the dispatcher; you need to make sure the function you use can accept the number of arguments it is matched against.
		Multiple dispatch does not merely generalize polymorphism, it also provides a more flexible alternative to inheritance in many contexts.
		But the huge advantage of the multiple dispatch style is in the seamlessness with which you can combine shapes of unknown types.
	www.ibm.com /developerworks/linux/library/l-pydisp.html (2018 words)

	Developing for Developers : The Visitor pattern and multiple dispatch
		One of the simplest strategies, and an effective one in practice, is to have the initial vtable dispatch the method to a "stub" method, whose job is to perform another vtable dispatch on the second argument.
		This form of dispatch, called multiple dispatch, is directly supported by languages such as Dylan, Cecil, and CLOS (the Common Lisp Object System).
		Actually multiple dispatch, like the polymorphism that it generalizes, is not at all like overloading.
	blogs.msdn.com /devdev/archive/2005/08/29/457798.aspx (1939 words)

	ROIP By MarineNet Wireless
		Controlling multiple remote base stations from multiple dispatch locations is now made very easy and cost effective with simple optional software upgrades.
		Allows multiple channel, cross connect, all call, audio recording of channel traffic is now possible without the high costs associated with dedicated dispatch consoles.
		PC's for dispatch should have Windows 2000 or XP at 400 MHz processor or higher with 256mb memory.
	www.marinenet.net /roip.htm (654 words)

	Dispatch Automated Publishing Solutions
		Dispatch can bring this process down to a fraction of that time, freeing up staff and adding powerful features previously impossible with manual coding.
		With Dispatch Statistics, you can determine what subject matter is being read, if readers prefer short pages versus long pages, who the most popular authors are, what the most frequently read stories have in common, historical trends and so much more.
		Dispatch has the ability to manage the integration of these revenue opportunities automatically using simplified commands, handling multiple revenue partners.
	dispatch.net /overview.html (790 words)

	Multiple Dispatch
		Ideally, it should be as fast as double dispatch, which is the simplest available technique for multiple dispatch in C++.
		Therefore, extension is still problematic and the technique is mostly useful when you can't modify the base class, for instance because it is in a shared library or you don't have the source code.
		Double dispatch is at the heart of the Visitor pattern, and several authors have tried to overcome the cyclic nature of Visitor.
	www.eptacom.net /pubblicazioni/pub_eng/mdisp.html (2726 words)

	perl.com: Apocalypse 12
		It's a little harder to refactor between single dispatch and multiple dispatch, but a good argument could be made that it should be harder to do that, because you're going to have to think through a lot more things in that case anyway.
		By default, if single dispatch doesn't find a suitable method, it does a "failsoft" to multiple dispatch, pretending that you called a subroutine with the invocant passed as the first argument.
		If single dispatch locates a class that defines the method, but the method in question turns out to be a set of one or more multi methods, then, the single dispatch fails immediately and a multiple dispatch is done, with the additional constraint that only multis within that class are considered.
	www.perl.com /pub/a/2004/04/16/a12.html?page=10 (1525 words)

	Charming Python: Multiple dispatch
		When a function is called from the dispatcher, it is passed the arguments used in the call to the dispatcher; you need to make sure the function you use can accept the number of arguments it is matched against.
		Multiple dispatch does not merely generalize polymorphism, it also provides a more flexible alternative to inheritance in many contexts.
		But the huge advantage of the multiple dispatch style is in the seamlessness with which you can combine shapes of unknown types.
	www-106.ibm.com /developerworks/linux/library/l-pydisp.html (2018 words)

	code::gallery :: Single, Double And Multiple Dispatch :: July :: 2006 (Site not responding. Last check: )
		Typically, multiple methods or functions are given the same name, because the represent the same purpose.
		In the single dispatch mechanism, the method to be invoked in determined using the object, usually type of the object, on which it is invoked.
		One of the common designs of multiple dispatch is to separate the methods from the class (which contains the structure).
	codegallery.blogsome.com /2006/07/22/single-double-and-multiple-dispatch (451 words)

	multipledispatch (Site not responding. Last check: )
		Multiple Dispatch semantics are when the actual types of all arguments are used to decide which method to call.
		Multiple dispatch is found in Common Lisp and other languages and is therefore not a new design pattern.
		The reasons for wanting multiple dispatch or something similar in the context of adding methods to a class without modifying the class are well noted by many authors including Matthias Zenger and Martin Odersky and are also explained below in the form of a Numeric Example.
	www.javalobby.org /java/forums/c6689.html (1885 words)

	Efficient Multimethods in a Single Dispatch Language (Site not responding. Last check: )
		Hence, triple dispatch is performed for three argument multimethods, quadruple dispatch for four, octuple dispatch for eight, etc. At each step, identified class/type information is “mangled” into the selectors, that is, we automatically generate the same code that a programmer would write to implement multiple dispatch in Smalltalk.
		We believe that multiple dispatch is sufficiently often used; sufficiently routine; sufficiently arduous to hand code; and that our (and others) implementations are sufficiently efficient for it to be worthwhile to include into object-oriented programming languages.
		Multiple dispatch in dynamic languages was first supported in the LISP based object-oriented systems LOOPS and NewFlavours [Bobrow 1983; 1986].
	www.laputan.org /reflection/Foote-Johnson-Noble-ECOOP-2005.html (6764 words)

	[No title] (Site not responding. Last check: )
		In a method call such as receiver.equals(arg2) a dispatch is made to code for the "equals" method based on the run-time class of the object denoted by "receiver".
		In multiple dispatch, the code selected to run a method can potentially be based on the run-time classes of all the arguments.
		Multiple dispatch makes it easier to express and type check methods, like "equals", that act on multiple arguments of the same type, and to express design patterns such as the "visitor" pattern.
	www.cis.ksu.edu /Department/Seminars/garle.html (288 words)

	Mica (Site not responding. Last check: )
		Most object-oriented languages could be classified as having "single dispatch." This means that methods are identified by their name ("selector" in Smalltalk terminology) and the object that the message is being sent to ("self" or "this").
		In this case, method dispatch is simply a matter of matching the selector to the correct method on the object to execute.
		Multiple dispatch, or "multimethods", means that in addition to the selector and the receiver of the message, all the arguments passed in the message are considered; the final method picked is the one whose signature matches for every single argument in the message.
	darksleep.com /mica (1067 words)

	"Modularly Typesafe Interface Dispatch in JPred"
		Multiple dispatch generalizes the receiver-oriented dynamic dispatch of traditional object-oriented (OO) languages by allowing the run-time classes of all arguments to be employed.
		While research over the last decade has shown how to integrate multiple dispatch with the modular static typechecking found in traditional OO languages, that work has been forced to impose unnatural restrictions or modifications in order to safely accommodate multiple inheritance.
		In this paper, we illustrate how the concept of predicate dispatch, which generalizes multiple dispatch by allowing each method to be guarded by a predicate indicating when the method should be invoked, provides a simple but practical way to support dispatch on interfaces while preserving modular typechecking.
	www.cs.ucla.edu /~todd/research/foolwood06.html (219 words)

	ONLamp.com -- Advanced OOP: Multimethods
		Multiple dispatch does not merely generalize polymorphism, it also provides a more flexible alternative to inheritance in some contexts.
		The advantage here of the multiple dispatch style is in the seamlessness with which you can combine shapes of unknown types.
		The benefit of multiple dispatch is to gain successively more precise about the types of the arguments.
	www.onlamp.com /pub/a/python/2003/05/29/multimethods.html (2029 words)

	Re: Multiple dispatch / multimethods?? (Site not responding. Last check: )
		Maybe this helps: Generic functions are like overloading where every single parameter is considered when doing dispatch, and subclasses of the parameters will "match" their superclass(es) for the purposes of dispatch.
		Being able to write methods that dispatch on more than one parameter is what distinguises generic functions from other dispatch systems.
		Because of the syntax of such languages, programmers often forget that the owning class is an implicit parameter ("this") for the purposes of dispatch.
	people.csail.mit.edu /gregs/info-dylan-archive-html-2001/msg00560.html (327 words)

	Dynamic Dispatch and Reuse
		Note that it is possible for the programmer to implement dynamic dispatch in non-object-oriented languages that allow pointers to functions, such as C. However, this requires that the programmer undertake the tedious and potentially error-prone task of initializing using the tables of function pointers.
		However, multiple dispatch has a higher run-time cost than single dispatch: techniques based on complete dispatch tables may require large tables, and other methods do not provide constant-time dispatch [1].
		Multiple dispatch can also be introduced as a programming technique rather than a language feature (for example, by using the visitor design pattern).
	www.usenix.org /publications/library/proceedings/coots01/full_papers/wonnacott/wonnacott_html/node2.html (1207 words)

	Re: Multiple dispatch / multimethods?? (Site not responding. Last check: )
		If you have dynamic dispatch on all arguments, there is no need that I can think of for static overloading.
		Perhaps you're confused by C++, where you can have dynamic dispatch on 1 argument or static dispatch on multiple arguments-- typical of the way C++ muddles things up.
		Dynamic dispatch on multiple arguments is the general case; C++ offers you 2 special cases.
	people.csail.mit.edu /gregs/info-dylan-archive-html-2001/msg00563.html (88 words)

	Multiple Dispatch and Subroutine Overloading in Perl
		Generally speaking, multiple dispatch is needed whenever two or more objects belonging to different class hierarchies are going to interact, and we need to do different things depending on the combination of actual types of those objects.
		Dispatch can also fail if there are no suitable variants available to handle a particular call.
		Multiple dispatch is a specialized technique that handles a small but important class of problems where two or more objects drawn from different hierarchies must interact polymorphically.
	search.cpan.org /src/DCONWAY/Class-Multimethods-1.70/tutorial.html (2713 words)

	Matt Fowles's Page
		The user creates this hierarchy by calling the dispatch object edge_add function for each of the inheritance links that need to be made, using the ids that have been gathered in previous steps.
		Once the dispatch object is constructed fully enough to support all of the specific functions that the user wishes to provide, the user can simply call the dispatch function on pointers to types derived from the base class even if those types do not directly appear in constructed graph.
		If our system of dispatch were put into the compiler, we would not need this restriction as the compiler can use the extra information that it already possess to determine these relationships.
	www.sccs.swarthmore.edu /users/04/fowles/MMD/index.html (1733 words)

	Dynamic Dispatch - Multiple Polymorphism in Java
		Multiple Polymorphism is the use of the actual (or dynamic) types of all arguments for method dispatch.
		This is the benefit of multiple polymorphism, all switch statements disappear, not only those involving a single class (that of the receiver.) Two classes, BankAccount and Currency, the receiver and argument, must be used to select a method, not just one.
		Multiple polymorphism is better because it is the right way to invoke methods (pass messages to objects.) This is a strong statement, but is correct.
	www.objectfaq.com /oofaq2/DynamicDispatch.htm (1153 words)

	Dispatch for ASP.net - it's like the FTP client Visual Studio never came with
		Dispatch is a deploy utility built exclusively for ASP.NET 2.0 and Visual Studio 2005.
		With Dispatch, you can filter out files that don't need to be uploaded using wildcard patterns so only relevant files are shown (configurable per project).
		All you have to do is blog about Dispatch (diggs count too) giving a brief overview and maybe even listing a few of your favorite features.
	www.dispatchasp.net (290 words)

	S13
		Perl allows you to declare multiple signatures for a given body, and these will be pattern matched as if you had declared separate multi entries.
		When you use the multiple signature syntax, the alternate signatures must all bind the same set of formal variable names, though they are allowed to vary in any other way, such as by type, or by which parameters are considered optional or named-only or slurpy.
		Dispatch is based on a routine's signature declaration without regard to whether the routine is defined yet.
	perlcabal.org /syn/S13.html (959 words)

	Related Work
		Some techniques for multiple dispatch (also known as multi-methods) [3,9,5,4] could be used to provide dispatch on a parameter other than the receiver of an object, or by including the type needed for dispatch in a new tuple type [12].
		However, recent techniques for multimethod dispatch [6] have very low overhead, and we believe they would be at least as efficient as our system for the case of single dispatch (which, as we have noted, is all that is needed to resolve the conflict between different kinds of reuse).
		We have also explored the possibility of allowing multiple virtual parameters [8], though this work does not make a significant contribution to the existing literature on multiple dispatch.
	www.usenix.org /events/coots01/full_papers/wonnacott/wonnacott_html/node11.html (750 words)

	#66349: FORTE--Using ActiveX controls that have multiple dispatch interfaces and event sets
		This is the theory for using multiple event sets and dispatch interfaces that might be provided by a control.
		If a control provides several dispatch interfaces, the default dispatch interface must provide a means of obtaining a handle to the other dispatch interfaces.
		To use the alternative dispatch interfaces, you need to use whatever means the default dispatch interface provides to obtain the handle to one of the other dispatch interfaces.
	sunsolve.sun.com /search/document.do?assetkey=1-9-66349-1 (888 words)

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