lager

C++ library for value-oriented design using the unidirectional data-flow architecture — Redux for C++ (by arximboldi)

Lager Alternatives

Similar projects and alternatives to lager

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better lager alternative or higher similarity.

lager reviews and mentions

Posts with mentions or reviews of lager. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-10-17.
  • HikoGUI v0.7.0, A fast desktop application GUI library in C++20. (BSL license)
    4 projects | /r/cpp | 17 Oct 2022
    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.
  • Dependency injection
    4 projects | /r/QtFramework | 23 Jul 2022
    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.
  • The Lisp Curse
    11 projects | news.ycombinator.com | 25 Mar 2022
    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/

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Stats

Basic lager repo stats
4
677
6.8
20 days ago

arximboldi/lager is an open source project licensed under MIT License which is an OSI approved license.

The primary programming language of lager is C++.

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