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Intent 01 Allow an object to alter its behavior when its internal state changes. The object will appear to change its class. An object-oriented state machine wrapper + polymorphic wrappee + collaboration Problem A monolithic object’s behavior is a function of its state, and it must change its behavior at run-time depending on that state.
Recent changes - 11 changed FAQs. In a list , or in a chain , or here: [4.1] , [4.2] , [6.3] , [6.12] , [10.3] , [15.22] , [27.15] , [35.13] , [35.14] , [35.15] , [39.6] . Translated into 16 languages. English , Belorussian / Minsk , Bosnian / Serbian / Croatian , Bulgarian , Chinese (GB, Mainland) , Chinese (Big5, Taiwan) , French , German , Greek , Korean , Polish , Portuguese , Romanian , Russian , Spanish , Turkish . Mirrored in 11 countries. USA , France , Germany , Ireland , Israel , Italy , Poland , Portugal , Spain , Taiwan , U.K. .
The Assignment Operator Revisited by Richard Gillam Advisory Software Engineer, Text & International IBM Center for Java Technology–Silicon Valley If you think you know it all in the C++ world, it must mean you’re not talking to your colleagues very much. If I had any pretensions to knowing it all when I wrote my assignment-operator article (" The Anatomy of the Assignment Operator ," C++ Report, Nov/Dec 1997), they didn’t last long afterwards. The assignment-operator article drew a huge response, with a lot of people sending me corrections and disagreements of various kinds.
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Although I haven't gotten to that part of my game server, I've tried to design it to avoid any sort of physics, because of the potential latency between a client and the server. (I'm targeting mobile users.) The only 'physics' that need to be calculated is when a player changes speed/direction, and you must calculate the path and detect collisions. However, to minimize negative effects on gameplay, both the client and the server 'dead reckon' the position of players in their immediate view bubble.
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If you are familiar with string template engines like Smarty (PHP) or Django (Python), then you know what template engines are about: to facilitate the separation of application code from presentation. Template engines are much less common in C++ than in web development, but things are slowly changing. Today, C++ application need to generate more and more web pages.
One of the most commonly used types is string , and string is an immutable class, meaning that once it’s assigned the type cannot change. To change the state of an immutable class, a new class needs to be instantiated. Developers rarely consider using immutable classes because our logic says immutable classes are inefficient. Yet one of the most used types, string , is immutable. Efficiency can be measured multiple ways, but for today’s hardware efficiency is best measured as code that gets in the way of the processor very little.
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This page collects some bad code that may not look so obviously bad to beginners. Beginners often struggle with the language syntax. They also have little knowledge about the standard JDK class library and how to make the best use of it. In fact I have collected all examples from everyday junior code. I have modified the original code to give it example character and such that it highlights the problems. Many of these problems can easily be detected by FindBugs , which is available as a simple Eclipse Plug-in.