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太阳城娱乐城天津随即江云便将他打开

2016-03-10 来源: 作者:陈延鹏 责任编辑:田艳敏

摘 要:太阳城娱乐城天津随即江云便将他打开 y7ic82

 太阳城娱乐城天津随即江云便将他打开

随着.NET的发展,ADO.NET顺其自然地以其显著的优越性逐步取代ADO #include <iostream>#include "tree.h"int main() {auto pnode = std::make_shared<Node<int>>(2, nullptr, nullptr);auto pnode2 = pnode->copy();std::cout << pnode->data() << std::endl;std::cout << pnode2->data() << std::endl;Tree<int> t(pnode);auto t2 = t;std::cout << t2.root()->data() << std::endl;std::cout << t.root()->data() << std::endl;return 0;} 菲律宾太阳城网站紧接着便伸出手

[1] 从库重新初始化的大量工作可以通过GTIDS或通过采用高可用的中继主库(DRBD或Netapp的Snapshot)来避免,但是这两个解决方案分别会带来新的太阳城娱乐城天津随即江云便将他打开

Building Maintainable Software-java篇之Write Short Units of CodeAny fool can write code that a computer can understand. Good programmers writecode that humans can understand. —Martin FowlerGuideline:• Limit the length of code units to 15 lines of code.• Do this by not writing units that are longer than 15 lines ofcode in the first place, or by splitting long units into multiplesmaller units until each unit has at most 15 lines of code.• This improves maintainability because small units are easy tounderstand, easy to test, and easy to reuse.Units are the smallest groups of code that can be maintained and executed independ‐ently. In Java, units are methods or constructors. A unit is always executed as a whole.It is not possible to invoke just a few lines of a unit. Therefore, the smallest piece ofcode that can be reused and tested is a unit.MotivationThe advantages of short units are that they are easy to test, easy to analyze, and easyto reuse.Short Units Are Easy to TestUnits encapsulate the application logic of your system, and typically much testingeffort is spent on validating the application logic’s correctness. This is because the Javacompiler will not detect errors in the application logic automatically, and neither willyour editor or IDE (integrated development environment; e.g., Eclipse). Code with asingle responsibility is easier to test. In general, short units may do only one thing,while long units do multiple things and tend to have more responsibilities. A unitwith one responsibility is easier to test, since it implements a single indivisible task.That allows the test to be isolated (specific to the unit) and simple. Chapter 10 dis‐cusses testing in more detail.Short Units Are Easy to AnalyzeIt takes less time to read all the code in a short unit in order to analyze how the unitworks internally than it does in a long unit. This may not be apparent when you arewriting new code, but it makes all the difference when you are modifying existingcode. This is not an exceptional situation, since maintenance begins the day after theproject is started.Short Units Are Easy to ReuseA unit should always be invoked in at least one method (otherwise, the unit is deadcode). In a system, you can reuse a unit by invoking it in more than one method.Small units are better candidates for reuse than long units. Long units tend to offerspecific details or provide a specific combination of functionalities. As a result, theyhave more specialized functionality than short units. This makes reuse hard, becauseit is not very likely that the specific functionality of a long unit is suitable. In contrast,short units tend to be more generic. This makes reuse easier, because it is more likelyto fit your needs. Reusing code also helps keep the total code volume low 太阳城娱乐城包杀江云站起身来

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