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The Visitor [1] design pattern is one of the twenty-three well-known Gang of Four design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.
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.
The visitor pattern solves this by factoring out the operation (pretty printing) to a separate class, which specializes in just pretty printing. So if you have many related types, and feel the urge to add more and more operations to (almost) every one of them, consider applying the Visitor pattern. --Objarni 10:57, 9 April 2012 (UTC)
Microsoft Excel has the basic features of all spreadsheets, [7] using a grid of cells arranged in numbered rows and letter-named columns to organize data manipulations like arithmetic operations. It has a battery of supplied functions to answer statistical, engineering, and financial needs.
The votes are in. Last month, on Nov. 14, Oxford University Press narrowed a list down to six words and the world had the opportunity to vote for its favorite. Language experts from the publishing ...
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The use and mechanics of agents ensure this. One possible downside of the use of agents is that an agent is computationally more expensive than its direct call counterpart. With this in mind, one ought never to presume the use of agents in the double-dispatch and their application in visitor patterns.
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