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C + + singleton mode and thread safety The simplest singleton mode can be // single thread safe version class Singleton { public: static Singleton* GetInstance(int x = 0) { if (instance_ == NULL) { instance_ = new Singleton(x); } return instance_; } void Print() { ...

Contents of this meeting: Python collects the data content of the website and saves the detailed information in PDF Development environment used this time: Python 3.8Pycham 2021.2 Professional EditionThe wkhtmltopdf installation package is required to save the PDF You can click to receive the above environment Module usage: Module to be in ...

Broken thoughts As the first group of people who came into contact with the Internet in China, there are countless pictures of ancient times on my hard disk, and many of them are downloaded from forums that are not very popular. As we all know, this uses phpwind v7 5. For the widely used Chinese Forum, its user id actually corresponds to a str ...

Friends, if you need to reprint, please indicate the source: https://blog.csdn.net/jiangjunshow Statement: during the teaching of artificial intelligence technology, many students asked me some python related questions. Therefore, in order to let the students master more extended knowledge and better understand AI technology, I asked my assist ...

Environment: Java8 + aviator5 two point five Introduction to Aviator Aviator is a high-performance and lightweight expression evaluation engine implemented in java language, which is mainly used for dynamic evaluation of various expressions. Now there are many open source java expression evaluation engines available. Why do you need avatar? ...

Complete Guide to Python and ArcGIS automated mapping (3): assigning templates In the second chapter of the guide, we made three mxd templates of different sizes to adapt to different drawing units. For example, the mxd template adapted to Zigong City is not suitable for Guangyuan City (Guangyuan City has a large area). How to let the computer ...

1. Foreplay JavaScript is divided into ECMAScript, DOM and BOM. Some interactive functions of web pages use BOM and DOM related knowledge. BOM (Browser Object Model) refers to the Browser Object Model, which enables JavaScript to "talk" with the browser. DOM (Document Object Model) refers to the Document Object Model, through ...

Transferred from: Micro reading   https://www.weidianyuedu.com There are many popular programming languages on the market, such as Python , JAVA, Go, etc. you may think C language is very old and backward. If you have this idea, you may just be a beginner. Before I shared with you the definition and usage of several special standards in C la ...

Transferred from: Micro reading   https://www.weidianyuedu.com preface This paper lists 36 vue development skills; Subsequent vue 3 After X comes out, it will be updated continuously 1,require.context() 1. Scenario: if the page needs to import multiple components, the original writing method: import titleCom from "@/components/home/t ...

Author: Han Xinzi@ShowMeAITutorial address: http://www.showmeai.tech/tuto...Article address: http://www.showmeai.tech/article-detail/90Notice: All Rights Reserved. Please contact the platform and the author for reprint and indicate the sourcePython date and timeIn the development process of python, we often have to deal with time type data. Pyt ...