effective oracle by design

member of the class:Rational{public: operator* (lhs);}; When we try to mix arithmetic, you'll find that only half of it makes sense:result, Onehalf;result = onehalf * 2;result = 2 * onehalf;The second assignment statement above is wrong because it is equivalent to result=2.operator* (Onehalf), which is obviously wrong.The 2nd statement is equivalent to Result=onehalf.operator (2), which can be executed successfully because 2 has an implicit type conversion because rational has a non-expli

depend on type judgment. Supports the method chain, which makes the code more fluid to write. In the penultimate chapter, there is one more chapter to be finished. Although the content of this chapter is not much, I seem to be struggling with these chapters because I can't find the focus. How much of the code directly determines the degree of understanding of the article, this chapter can be written in some code back and then look again and again, after mastering the ability to become

PATH environment variable, copy the value to a text editor, find the corresponding Oracle value, delete it, then copy the modified string and paste it into the PATH environment variable, which is relatively safe.6. Restart the operating system.After the above steps have been completed, restart the operating system.7. The various Oracle-related processes are not loaded after restarting the operating system.

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reflected anomalies are concentrated in the running period, which is not easy for abnormal control, so it is not recommended] Use local methods with caution [platform migration is over] Careful optimization [Analysis good optimization, as far as possible in the design of good or bad to optimize, otherwise optimization may lead to unnecessary waste] Adherence to universally accepted naming conventions [easy to understand and team consensus

Tips"Effective Java, third Edition" an English version has been published, the second edition of this book presumably many people have read, known as one of the four major Java books, but the second edition of 2009 published, to now nearly 8 years, but with Java 6, 7, 8, and even 9 of the release, the Java language has undergone profound changes.In the first time here translated into Chinese version. For everyone to learn to share. 19. If the use

-virtual functions specify interface inheritance and enforce inheritance. (as described in clause 33, do not hide non-virtual functions of the base class in a derived class in public inheritance)//Article 38: By compounding the mold out of the has-a or according to something to achieve//clause 39: Use private inheritance wisely and cautiously//1. Private inheritance is highly likely to be an orthodox design strategy when one of the classes needs to ac

Consistency is a common concept in design. Good consistency will help enterprises to create brand image, significantly reduce customer/user learning costs and cognitive costs; From a system perspective, a highly consistent process is also the basis for ensuring product quality and operational efficiency. The most famous example here is McDonald's VI and product line. However, how important is the principle of consistency and under what circumstances

be declared private.Who should take a member of the new type?This question helps you decide which member is public and which is private. It also helps you to figure out which class or fuction should be friends and whether it is reasonable to nest them in another.What is the "undeclared interface" for the new type (undeclared interface)? (Do not understand??? ）What assurance does it provide for efficiency, exception security (clause 29), and resource utilization (such as multitasking and dynamic