Category：Program Language
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Time：2021-9-18
CountDownLatch Subtraction counter import java.util.concurrent.CountDownLatch; //Counter public class CountDownLatchDemo { public static void main(String[] args) throws InterruptedException { //The total number is 6. It can be used when the task must be performed CountDownLatch countDownLatch = new CountDownLatch(6); for (int i = 0; i < 6; i++) { new Thread(()->{ System.out.println(Thread.currentThread().getName()+” Go out”); countDownLatch.countDown(); },String.valueOf(i)).start(); […]
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Time：2021-9-18
Rustcon Asia enters the countdown! Just this Saturday, 300 + developers will gather in Beijing to participate in Asia’s largest rust language developers conferenceRustCon Asia。 The conference will gather almost all senior developers of rust Chinese community, Chinese local rust projects that have been applied in the production environment, and top developers from Europe, Australia […]
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Time：2021-9-18
Video address Headline address:https://www.ixigua.com/i677586170644791348…Station B address:https://www.bilibili.com/video/av81202308/ Source address GitHub address:https://github.com/anonymousGiga/learn_rus… Explanation content 1. Match byExample 1: let x = 5; match x { 1..=5 => println! (“one through five”), // that is, the range from 1 to 5 is matched _ => println!(“something else”), } Note: in the example, 1.. = 5 is equivalent to […]
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Time：2021-9-18
Introduction How to distinguish Template parameters const disqualify universal reference Auto declaration Introduction T&&Right value references are not always used in Code: void f(Widget&& param); // rvalue reference Widget&& var1 = Widget(); // rvalue reference auto&& var2 = var1; // not rvalue reference template void f(std::vector&& param); // rvalue reference template void f(T&& param); // […]
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Time：2021-9-18
Carbon is a lightweight, semantic and developer friendly golang time processing library, which supports chain calls, lunar calendar, Gorm, xorm and other mainstream orm If you feel good, please give a star github:github.com/golang-module/carbon gitee:gitee.com/go-package/carbon //Yesterday at this moment carbon.Yesterday().ToDateTimeString() // 2020-08-04 13:14:15 //Yesterday and now of the specified date carbon.Parse(“2021-01-28 13:14:15”).Yesterday().ToDateTimeString() // 2021-01-27 13:14:15 //Now […]
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Time：2021-9-18
Binary thresholding First, select a specific threshold value, such as 127The new threshold generation rule is:The gray value of pixels greater than or equal to 127 is set to the maximum value (for example, the maximum 8-bit gray value is 255)The gray value of pixels with gray value less than 127 is set to 0 […]
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Time：2021-9-18
Series articles： Design pattern summary (pattern) Design pattern summary (Theory) Summary of design patterns (practice 1) Practice leads to truth The knowledge content related to the two design patterns summarized above has a relatively clear understanding of how to standardize the code and write the code. In writing the code, we will also deliberately write […]
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Time：2021-9-18
In the previous articles, we may often use the command entc. The tool entc brings many functions to. This article mainly arranges the code generation in ENT orm In the previous example, there is a lack of knowledge, that is, if we want to see the detailed native SQL statements during the execution of ORM, […]
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Time：2021-9-18
The text and pictures of this article come from the network, only for learning and communication, and do not have any commercial purpose. If you have any questions, please contact us in time for handling. The following article first level Python technology, by Parson sauce Novices and Xiaobai who have just come into contact with […]
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Time：2021-9-18
1、 Function call What is a function call? Usually in C language, a complete project program cannot realize all functions in one function. It is implemented by several functions with different functions, and there will be calls between functions. Of course, it doesn’t mean that you must write the function modules separately, but if you […]
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Time：2021-9-18
1. Problem background A core Java long connection service uses mongodb as the main storage. Hundreds of machines on the client are connected to the same mongodb cluster. There are many performance jitters in the short term. In addition, there is an “avalanche” failure. At the same time, the traffic drops to zero instantly and […]
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Time：2021-9-18
What is a multi byte string operation? In fact, many students may have used it, but we still have to start with the most basic problem. A character takes up a few bytes, which is not what we see on the surface. Normally, a number or English and English symbols occupy one byte. However, there […]
