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This is the second article in this series, covering the usage, implementation, and usage of the prefetch_related () function. The first article in this series is here 3. prefetch_related () You can use prefetch_related () to optimize

The declaration of protocol seems to be a class interface in Java, but the difference is that Protocol does not have a parent class and cannot define instance variables. Protocol is a special program design structure used to declare methods

Pprint-beautiful print Role: beautiful print Data Structure Pprint contains a "beautiful printer" used to generate a beautiful view of the data structure. The formatting tool will generate some representation of the data structure, which can not

Research on C ++ -- pointer and reference There are two transfer methods for the number of functions or procedures in VB: value transfer and reference transfer. Use keywordbyval and keywordbyref respectively. If the number of arguments is passed by

Item 3: Use const whenever possible By Scott Meyers Translator: fatalerror99 (itepub's nirvana) Release: http://blog.csdn.net/fatalerror99/ One wonderful thing about const is that it allows you to specify a semantic (semantic) Constraint: a specific

Item 1: view C ++ as Federation of languages) By Scott Meyers Translator: fatalerror99 (itepub's nirvana) Release: http://blog.csdn.net/fatalerror99/ Initially, C ++ only added some object-oriented (Object-Oriented) features on the basis of C. The

Jianshu Lao Tzu Transferred from Baidu encyclopedia [Revision]: Ma hairuo [description]: in order to retain the necessary contrast, this revision is arranged in the order of Yi Shu, A and B, the Arabic numerals in the question [] indicate the order

Access from a derived class to a base class Class base{Foo (INT );Protected:Int bar;Double foo_BAR;}; Class derived: public Base{Foo (string );Bool bar (base * pb );Void foobar ();Protected:String bar;};   The following errorsBool derived: bar (base

In a dialog box-based program, a task is to change the background of the edit box control. What should I do? The implementation idea is as follows. When the child control is to be drawn, wm_ctlcolor will be sent to the parent class (the main window

Flask is a lightweight WEB application framework written using Python. Its WSGI Toolbox uses Werkzeug, and the template engine uses JINJA2. Many of the features are implemented by reference to the Django framework. Due to the needs of the project,

The login module, written separately as the MyLogin () method, is saved as modeltry119.py, and then the interface's file is only written to the interface,In the case of a POST request, the cookies returned by reference to MyLogin () are

The notes and labels (Label and Annotation) in ArcGIS are unclear. The excerpt is as follows: In ArcMap, you can use Label and Annotation to identify elements. Choosing Label or Annotation depends on how you need to control text display and how to

* ****************************** Loongembedded ******* ************************* Author: loongembedded (Kandi) Time: 2012.1.7 Category: FPGA development * ****************************** Loongembedded ******* *************************   Note: The

The ship cannot leave the sky. Although we have already built the ship and tested it successfully in the previous section, we still haven't given the ship a larger background to soar. In one scenario, only the subject is not enough, and rendering of

EventBus and androideventbus for simple use of Android third-party class libraries EventBus for third-party Android Class Libraries1 PS To do something better, you must first sharpen the tool. Eventbus is also a common tool in development. This

Simple Analysis of C ++ smart pointers and smart pointer AnalysisGuide I recently made up the sixth edition of C ++ Primer Plus. This is indeed a good book. The chapter on smart pointers is very clear, and I have encountered many puzzles. During the

IOS development-custom list controls In the past two days, projects are relatively idle. When you are idle, You can implement the list control by yourself. It took about one day from the start of the project to the preliminary completion. At present,

I. Linux basic management commands and Linux management commands 1. Shutdown and restart command (1) shutdown command: shutdown [Option] Time Option:-c. Cancel the previous shutdown command. -H Shutdown -R restart Example: shutdown-h now # shut down

Hotel comment sentiment analysis system (I) -- A Summary of text disposition Analysis Question:The author analyzes the text disposition of the reviews of the hotel and analyzes whether the reviews of the Hotel (including the general evaluation and

Currently, the CI framework is available in version 2.0. I always wanted to try the core of my novel website.I searched my website in China and found no such information. As long as I look for e-wen's website, I still find it. After testing, it can