Table of Contents need: analyze: Some code implementation: 1. Operations implemented using only flag bits: 2. For greater security, the mutex lock code is added: 3. Use it with unique_lock to make the code safer Four: Use guard lock lock_guard to work with it 5. You can also use condition variables to process, which will […]
Tag: var
Spring Boot implements various parameter verifications. It is so well written. It is recommended to collect it!
Hello everyone, I am a passerby~~~ Click on the card below to follow me, java dry goods will be delivered in time I have written an article about the use of Spring Validation before, but I still feel that I am superficial. This time I plan to thoroughly understand Spring Validation. This article will introduce […]
Use R language to export pictures in various formats
Welcome to follow the WeChat official account (Medical Bioinformatics), medical students’ student notes to record the learning process. Common image formats include: pdf, jpeg, tiff, png, svg, wmf. pdf, svg and wmf are vector graphics formats, so there will be no blur when enlarging the picture. jpeg, tiff and png are bitmap formats and will […]
In embedded design, for a variable storage design with only two states, how to efficiently quantify the deviation of the tracking car…
Foreword (1) In embedded programming, we often need to store data from various sensors. Most of the time sensors, such as infrared light sensors, return data that is either 0 or 1. Therefore, only one bit is needed to store it. However, many people often use char array storage, so that only one-eighth of the […]
Examples of various table relationships used by gorm – primary and foreign keys -> struct
Examples of various table relationships used by gorm-primary and foreign keys->struct One-to-many relationship (users and articles) like: Boss and employees Goddess and licking dog teacher and student Classes and students Users and articles … Take users and articles as examples models should be like, Attention! ! : The ID in the User table should be […]
Various methods of positioning web page elements using Selenium!
To use Selenium to automate operations, the first thing to do is to open a URL link through the get() method of webdriver. After opening the link and completing the page loading, you can perform various operations on the page through the interface provided by Selenium. Let’s learn how to find elements. 3.1 Find and […]
std::condition_variable condition variable and lock_guard, unique_lock
Used to block one thread, or block multiple threads at the same time, until another thread modifies the shared variable (condition) and notifies condition_variable. A thread that intentionally modifies a variable must Obtain std::mutex (often via std::lock_guard ) Modify while holding lock Perform notify_one or notify_all on std::condition_variable (no need to hold locks for notifications) […]
Comprehensive explanation of Java regular expressions and various sample codes
In-Depth Guide to Java Regular Expressions Introduction Regular expressions are a powerful text matching tool that are widely used for operations such as string search and replacement. In Java, the use of regular expressions involves the Pattern and Matcher classes. This article aims to provide a more in-depth perspective, detailing the various symbols and patterns […]
[SCM graduation project] [cl-014] Intelligent traffic lights | Intelligent traffic lights | Time-variable traffic lights
1. Basic introduction Item name: Design of intelligent traffic light monitoring system based on microcontroller Design of intelligent traffic light monitoring system based on microcontroller Design of time-variable traffic light detection system based on microcontroller Project name: traffic light Project number: mcuclub-cl-014 Microcontroller type: STC89C52 Specific functions: 1. There are four directions: east, west, north […]
Use prototypes to implement various syntaxes of Class
I have never paid enough attention to Class before. The usual use of prototypes is limited to hanging properties on the prototype of the constructor. There is no need for a prototype, not to mention that your Class is just a syntactic sugar for the prototype? Until the company started a webgis project using openlayers. […]