lager
Boost.Asio
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lager | Boost.Asio | |
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4 | 20 | |
681 | 4,621 | |
- | - | |
6.5 | 8.6 | |
about 1 month ago | 6 days ago | |
C++ | C++ | |
MIT License | - |
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lager
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HikoGUI v0.7.0, A fast desktop application GUI library in C++20. (BSL license)
observer: I changed how observer<> works, this is basically a template-class which observes a value and then calls a registered callback on modification. It can now create a sub-observer<> from a member variable of the value it observers. This makes it possible for widgets to be composable. This is based loosely on lager's lenses and cursors.
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QtDevCon22 – How Can I Make My Qt Apps More Rusty?
By using arximboldi/lager
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Dependency injection
My preferred approach is to abstract things so the boundary between the objects is not a function call, but a value being passed. This was shown to me the first time via Boundaries (from Gary Bernhadt). In C++ world, the talks from Juan Pedro Bolívar Puente are great, as he also is the author of a framework to structure applications that way, the framework is open source, and it's been used in production applications, probably using Qt as well. I would start by watching The Most Valuable Values and Squaring the Circle. If you prefer text, go read Lager's excellent documentation.
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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
[8] https://github.com/dmitigr/pgfe
[9] https://entangled.github.io/
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).
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how do i include header only libraries to my project.
as a side note, Asio is also released as an independent library without the boost stuff https://think-async.com/Asio/
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Any recommendations to use instead of Asio now that standalone version is dead?
Now that vinniefalco is going to kill off the asio standalone (see deprecate standalone ) and only support boost what would people then recommend to switch over to.
- 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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C++ 2D Game Development Stream 12 Notes
The library is found at https://think-async.com/Asio/.
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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
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Can anybody recommend a good place to gig hire software engineers?
Here's the main contributor to Asio. I looked at Asio's repository and this was the first guy.
- Ask HN: What are some examples of elegant software?
What are some alternatives?
pgfe - PostgreSQL C++ driver
libuv - Cross-platform asynchronous I/O
libriscv - C++20 RISC-V RV32/64/128 userspace emulator library
libevent - Event notification library
fruit - Fruit, a dependency injection framework for C++
C++ Actor Framework - An Open Source Implementation of the Actor Model in C++
syslog - Erlang port driver for interacting with syslog via syslog(3)
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.
Crow - A Fast and Easy to use microframework for the web.
libev - Full-featured high-performance event loop loosely modelled after libevent
kangaru - 🦘 A dependency injection container for C++11, C++14 and later
Oat++ - 🌱Light and powerful C++ web framework for highly scalable and resource-efficient web application. It's zero-dependency and easy-portable.