Boost.Asio
RE2
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Boost.Asio | RE2 | |
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20 | 49 | |
4,597 | 8,591 | |
- | 0.8% | |
8.1 | 8.8 | |
8 days ago | 9 days ago | |
C++ | C++ | |
- | BSD 3-clause "New" or "Revised" License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Boost.Asio
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How to synchronize access to application data in multithreaded asio?
Indeed looks like it, strand_executor_service.hpp is using a Mutex internally (otherwise it wouldn't make sense to me).
- Not young programmer wants to find source to liquidate gap in modern C++ knowledge.
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LumoclastFW 10 - Networking System
The ASIO framework can be found at https://think-async.com/Asio/ and the relevant license for its use is included in the GitHub repository in the Vendor/licenses directory.
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Multiplayer Networking Solutions
Asio Extracted from the much bigger Boost C++ library, it's apparently a really good networking library. As a bonus it also handles async / threads. Here's a really good video tutorial by OneLoneCoder
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My experience with C++ 20 coroutines
Yes: https://github.com/chriskohlhoff/asio/blob/master/asio/include/asio/coroutine.hpp
- Ask HN: What are some examples of elegant software?
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The Lisp Curse
I like working in C++, after a decade of working in Java, Python, Javascript and Clojure, I find working in C++ (which I learned before these other languages) to be quite fun and pleasant, at least with relatively modern C++.
I've been, on and off, working on a little toy game engine, for a few years. Its a mix of keeping up with C++ advancements, learning various concepts like physically based rendering, and just the fun of crafting a big project, with no constraints other than my time and ability, no deadlines, no expectation of releasing anything. Its cathartic and enjoyable. I really do enjoy it.
Last September, I got frustrated with something I was working on in a more serious capacity. It was some server software, it responded to HTTP requests, it accessed third party services over HTTP and Websockets, it talked to a Postgres database. Overall it was an event driven system that transformed data and generated actions that would be applied by talking to third party services. The "real" version was written in Clojure and it worked pretty well. I really like Clojure, so all good.
But because I was frustrated with some things about how it ran and the resources it took up, I wondered what it would be like if I developed a little lean-and-mean version in C++. So I gave it a try as a side project for a few weeks. I used doctest[1] for testing, immer[2] for Clojure-like immutable data structures, [3] lager for Elm-like application state and logic management, Crow[4] for my HTTP server, ASIO[5] and websocketpp[6] for Websockets, cpp-httplib[7] as a HTTP client and PGFE[8] for Postgres, amongst some other little utility libraries. I also wrote it in a Literate Programming style using Entangled[9], which helped me keep everything well documented and explained.
For the most part, it worked pretty well. Using immer and lager helped keep the logic safe and to the point. The application started and ran very quickly and used very little cpu or memory. However, as the complexity grew, especially when using template heavy libraries like lager, or dealing with complex things like ASIO, it became very frustrating to deal with errors. Template errors even on clang became incomprehensible and segmentation faults when something wasn't quite right became pretty hard to diagnose. I had neither of these problems working on my game engine, but both became issues on this experiment. After a few weeks, I gave up on it. I do think I could have made it work and definitely could go back and simplify some of the decisions I made to make it more manageable, but ultimately, it was more work than I had free time to dedicate to it.
So my experience was that, yes, you can write high level application logic for HTTP web backends in C++. You can even use tools like immer or lager to make it feel very functional-programming in style and make the application logic really clean. Its not hard to make it run efficiently both in terms of running time and memory usage, certainly when comparing to Clojure or Python. However, I found that over all, it just wasn't as easy or productive as either of those languages and I spent more time fighting the language deficiencies, even with modern C++, than I do when using Clojure or Python.
I think I would think very long and hard before seriously considering writing a web backend in C++. If I had the time, I'd love to retry the experiment but using Rust, to see how it compares.
[1] https://github.com/doctest/doctest
[2] https://github.com/arximboldi/immer
[3] https://github.com/arximboldi/lager
[4] https://github.com/CrowCpp/crow
[5] https://think-async.com/Asio/
[6] https://www.zaphoyd.com/projects/websocketpp/
[7] https://github.com/yhirose/cpp-httplib
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P2300 (Sender/Receiver) is DEAD in the water for C++23 !!!
When was it? Executors (or proto executors if you want) were a thing in ASIO at least since early 00s - https://github.com/chriskohlhoff/asio/commit/02a2d65e4e8b95edc37b325c254017d23f31c342
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Can you guys recommend a multiplatform alternative to POSIX sockets?
Take a look at asio (https://think-async.com/Asio/)
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Boost v1.78.0
As the commit (https://github.com/chriskohlhoff/asio/commit/36440a92eb83da34b7516af2632b119f83b66a35) explains, you can have io_uring to support the new I/O objects (i.e. files), but still using the epoll reactor for the other I/O objects. And that seem to be the only reason why the eventfd is there: you are still using epoll, but with io_uring through the eventfd to support things epoll doesn't support.
RE2
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C Is the Greenest Programming Language
Looking at the benchmark where C++ is worst compared to other languages, it's depending on the library used. I would guess if they used Google's re2 Regex library instead of Boost's, the result would be different.
https://github.com/greensoftwarelab/Energy-Languages/blob/ma...
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RE2 VS hyperscan - a user suggested alternative
2 projects | 17 Mar 2023
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hyperscan VS RE2 - a user suggested alternative
2 projects | 17 Mar 2023
RE2 is a Google regular expression library
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Projects ideas to learn C++/OOP
google's regex library: https://github.com/google/re2
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First release of SPVM::File::Spec - complex regular expressions, file tests, SPVM::Cwd, inheritance
I ported Google RE2, a regular expression library, to SPVM as Resource::Re2, and created SPVM::Regex, a wrapper for it.
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SPVM::File::Basename is released. This is the first module of SPVM using regular expressions.
I searched for I found that there is a Perl compatible regular expression called Google RE2. It is written in C++, and with Google RE2, I can use Perl-compatible regular expressions as a library.
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Ruby 3.2.0 Is from Another Dimension
Yes, but there is an interesting clarification here. RE2 has used the "caching" approach documented in the Ruby bug ticket linked for quite some time (since its birth?): https://github.com/google/re2/blob/954656f47fe8fb505d4818da1...
It is mentioned only briefly in Cox's article on regex matching in the wild. Look for the word "bitstate": https://swtch.com/~rsc/regexp/regexp3.html
I didn't know Perl had implemented this trick too.
The paper[1] cited in the Ruby bug ticket was published very recently. When I first read the Ruby bug ticket, I immediately wondered how they sidestepped the memory use problem. The paper's abstract seems to suggest there is some technique for doing so, as it rebuffs the idea of doing "full" memoization. Alas, I do not have access the paper. (Which is fucking ridiculous.)
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Regex is comically slow. High performance alternatives? (Pattern matching for validation)
Take a look at Google's RE2: https://github.com/google/re2
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Rob Pike's simple C regex matcher in Go
See also: https://github.com/google/re2/blob/main/re2/bitstate.cc
Although its space complexity is P*T, which limits its use to small regexes/haystacks. It sounds like your claim is that your technique achieves a smaller space bound?
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Nginx-Ingress is driving me nuts
Did you check if your regex meets RE2 standard https://github.com/google/re2/wiki/Syntax , also try setting only the `use-regex` annotation and see (without the rewrite-target)
What are some alternatives?
libuv - Cross-platform asynchronous I/O
libevent - Event notification library
C++ Actor Framework - An Open Source Implementation of the Actor Model in C++
POCO - The POCO C++ Libraries are powerful cross-platform C++ libraries for building network- and internet-based applications that run on desktop, server, mobile, IoT, and embedded systems.
libev - Full-featured high-performance event loop loosely modelled after libevent
Oat++ - 🌱Light and powerful C++ web framework for highly scalable and resource-efficient web application. It's zero-dependency and easy-portable.
C++ REST SDK - The C++ REST SDK is a Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C++ API design. This project aims to help C++ developers connect to and interact with services.
compile-time-regular-expressions - Compile Time Regular Expression in C++
asyncio - asyncio is a c++20 library to write concurrent code using the async/await syntax.
Seastar - High performance server-side application framework
uvw - Header-only, event based, tiny and easy to use libuv wrapper in modern C++ - now available as also shared/static library!
semver.c - Semantic version in ANSI C