The story of how NASA, ESA, the Danish Technological University, neural networks, decision trees and other good people helped me find the best free hectare in the Far East, as well as in Africa, South America and other "so-so" places.
Providers of the Russian Federation, for the most part, use the systems of deep traffic analysis (DPI, Deep Packet Inspection) to block sites included in the register of banned. There is no single standard for DPI, there is a large number of implementations from different DPI providers that differ in the type of connection and type of work.
There are two common types of DPI connection: passive and active.
Passive DPIPassive DPI-DPI connected to the provider network in parallel (not in the section) either through a passive optical splitter or using the mirroring of user traffic. This connection does not slow down the speed of the network provider in the case of insufficient DPI performance, which is why it is used by large providers. DPI with this type of connection can technically only detect an attempt to query for prohibited content, but not to suppress it. To circumvent this restriction and block access to the denied site, DPI sends a specially crafted HTTP packet to the user requesting the blocked URL, redirecting to the stub page of the provider, as if the requested resource itself had been sent by the user (the IP address of the sender and the TCP sequence are forged). Because the DPI is physically located closer to the user than the requested site, the forged response reaches the user's device faster than the real response from the site.
The Unreal Engine project continues to develop - new code is added, and previously written code is changed. The inevitable consequence of the development in a project? The emergence of new bugs in the code that a programmer wants to identify as early as possible. One of the ways to reduce the number of errors is the use of the static analyzer, 'PVS-Studio'. If you care about code quality, this article is for you.
Although, we did it (https://www.unrealengine.com/blog/how-pvs-studio-team-improved-unreal-engines-code) two years ago, since that time we got more work to do regards code editing and improvement. It is always useful and interesting to look at the project code base after a two-year break. There are several reasons for this.
First, we were interested to look at false positives from the analyzer. This work helped us improve our tool as well, which would reduce the number of unnecessary messages. Fighting false positives is a constant task for any developer of code analyzers.
The codebase of Unreal Engine has significantly changed over the two years. Some fragments were added, some were removed, sometimes entire folders disappeared. That's why not all the parts of the code got sufficient attention, which means that there is some work for PVS-Studio.
The fact that the company uses static analysis tools shows the maturity of the project development cycle, and the care given to ensuring the reliability and safety of the code.
We won't be talking about all the errors that we found and fixed, We will highlight only those that deserve attention, to our mind.
Read more - https://www.unrealengine.com/en-US/blog/static-analysis-as-part-of-the-process
P.S. Those who are willing, may take a look at other errors in the pull request on Github. To access the source code, and a specified pull request, you must have access to the Unreal Engine repository on GitHub. To do this, you must have accounts on GitHub and EpicGames, which must be linked on the website unrealengine.com. After that, you need to accept the invitation to join the Epic Games community on GitHub.Instruction (https://www.unrealengine.com/ue4-on-github).
A development team, working on a static analyzer, has already checked a game engine under Windows. In this check we used a Linux version and the result showed that there were a large number of serious errors. The article covers only the general analysis warnings and only “High” level of severity (there are also Medium and Low levels).
In this article we'll look at the main features of SonarQube - a platform for continuous analysis and measurement of code quality, and we'll also discuss advantages of the methods for code quality evaluation based on the SonarQube metrics.
SonarQube is an open source platform, designed for continuous analysis and measurement of code quality. SonarQube provides the following capabilities:
One of the main problems with C++ is having a huge number of constructions whose behavior is undefined, or is just unexpected for a programmer. We often come across them when using our static analyzer on various projects. But, as we all know, the best thing is to detect errors at the compilation stage. Let's see which techniques in modern C++ help writing not only simple and clear code, but make it safer and more reliable.
What is Modern C++?
The term Modern C++ became very popular after the release of C++11. What does it mean? First of all, Modern C++ is a set of patterns and idioms that are designed to eliminate the downsides of good old "C with classes", that so many C++ programmers are used to, especially if they started programming in C. C++11 looks way more concise and understandable, which is very important.
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There are 3 types of lies: Lies, damned lies, and statisticsStatistics, infographics, data analysis and data science – who isn’t doing it right now. Everyone knows how to do it right, just left for someone to write how you SHOULDN’T do it. In the article we’ll try to fix it.
(Hazen Robert "Curve fitting". 1978, Science.)
- Sampling Bias
- Well-chosen average
- 10 more failed experiments of which we haven’t written yet
- Playing with scale
- Selecting 100%
- Hiding main numbers
- Visual metaphor
- Example of qualitative visualization
- Conclusion and what to read next
You are so lucky to be a programmer. I would like to be the programmer.
- Why do not you learn?
- I already tried. I checked out codeacademy and other websites, but it is not mine.
- Yep, the programming is not really for everyone.
- You are well paid, and you can create different things. Almost every day you get some crazy offers at least for 100 thousand dollars.
- Yep, honestly it's very flattering and a little mind-blowing.
- You get your share in the company and you know that the software engineers are always respected. You can implement any idea in the app and get rich. Moreover, you do not need to hire anyone for this.
- Actually, the programming makes me miserable.
- Wow. What do you mean by that?
- In order to be a good programmer, I need to develop a special mindset and that makes me sad. I noticed this in other programmers, of course, not all, but in many.
- What is this mindset?
- This is concentration on the strengths, and not on the weaknesses.
- Why do you need this to become a good coder?
- I work like this:
Do you remember this movie? What is it doing here? Why the hell such post on Kukuruku at all?
I guess, because I think that the main piece of IT is human, or rather our brain. I’ll tell you about another possibility of using your brain a bit more effectively. Everything described here has been tried out on me. It’s important to note that I’ll highlight if I haven’t tried something out. I didn’t use any drugs or devices. Popular methods have only been used. And yes, it’s devastatingly realistic. Having tried it once, you'll never resist telling about it.