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Toggle Java example subsection. 10.1 Diagram. 10.2 Sources. 10.3 Output. ... Provides a context-free and type-safe implementation of the Visitor Pattern in Java based ...
With this in mind, one ought never to presume the use of agents in the double-dispatch and their application in visitor patterns. If one can clearly see a design limit as to the domain of class types that will be involved in the co-variant interactions, then a direct call is the more efficient solution in terms of computational expense.
The single-serving visitor pattern should be used when visitors do not need to remain in memory. This is often the case when visiting a hierarchy of objects (such as when the visitor pattern is used together with the composite pattern) to perform a single task on it, for example counting the number of cameras in a 3D scene.
As a side note we already have few examples of visitor patterns elsewhere (e.g. C++ example or java one). I have a nice book on OOP programming (1997) I used as reference for Container (abstract data type). It has a dedicated subsection called 15.4 Iteration where a case of visitor pattern use is explained so I'm going to cite it if nobody minds.
Efforts have also been made to codify design patterns in particular domains, including the use of existing design patterns as well as domain-specific design patterns. Examples include user interface design patterns, [ 7 ] information visualization , [ 8 ] secure design, [ 9 ] "secure usability", [ 10 ] Web design [ 11 ] and business model design.
Multiple dispatch is used much more heavily in Julia, where multiple dispatch was a central design concept from the origin of the language: collecting the same statistics as Muschevici on the average number of methods per generic function, it was found that the Julia standard library uses more than double the amount of overloading than in the ...
In object-oriented design, the chain-of-responsibility pattern is a behavioral design pattern consisting of a source of command objects and a series of processing objects. [1] Each processing object contains logic that defines the types of command objects that it can handle; the rest are passed to the next processing object in the chain.
The active object design pattern decouples method execution from method invocation for objects that each reside in their own thread of control. [1] The goal is to introduce concurrency, by using asynchronous method invocation and a scheduler for handling requests. [2] The pattern consists of six elements: [3]