arximboldi/immer on Hacker News

I've seen some C++ libraries that implement persistent data structures like immer ( https://github.com/arximboldi/immer ) - but seems it requires the use of the Boehm GC (which is notorious to be slow, since it is a conservative GC and…

comment by cyber_kinetist · 2026-02-15 · in I'm building a clarity-first language (compiles to C++)

…pill to swallow. You may want to consider a tracing GC for Herd. [1] https://tmbasic.com [2] https://github.com/arximboldi/immer

comment by electroly · 2026-01-26 · in Show HN: A small programming language where everything is pass-by-value

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Immer – A library of persistent and immutable data structures written in C++

story by smartmic · 2025-12-21 · 18 comments

Oh for sure. That's not the tough part. :) jank uses immer for that: https://github.com/arximboldi/immer

comment by Jeaye · 2024-05-23 · in Try Clojure

…structures. It's probably not something that is suitable for all domains, but worth checking out. https://github.com/arximboldi/immer

comment by vinkelhake · 2023-12-12 · in Text Editor Data Structures: Rethinking Undo

How does this compare to https://github.com/arximboldi/immer (other than the C/C++ difference)? Also, it's my understanding that, in practice, persistent data structures require a garbage collector in order to handle deallocation when used…

comment by erichocean · 2023-07-11 · in Show HN: A hash array-mapped trie implementation in C

…data structures for C++, then I highly recommend Immer. High quality and easy to work with. https://github.com/arximboldi/immer

comment by vinkelhake · 2023-07-11 · in Show HN: A hash array-mapped trie implementation in C

…be interested in ewig and immer by Juan Pedro Bolivar Puente: https://github.com/arximboldi/ewig https://github.com/arximboldi/immer See the author instantly opening a ~1GB text file with async loading, paging through, copying/pasting, and…

comment by modernerd · 2023-06-14 · in Text Editor Data Structures

For C++ check this one out - https://github.com/arximboldi/immer and this talk from the author - https://www.youtube.com/watch?v=_oBx_NbLghY (CppCon 2018: Juan Pedro Bolivar Puente “The Most Valuable Values”)

comment by malkia · 2023-05-30 · in Purely Functional Data Structures (1996) [pdf]

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Persistent and immutable data structures written in C++14

story by masijo · 2023-05-10 · 0 comments

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immer: Postmodern immutable and persistent data structures for C++

story by tosh · 2022-08-17 · 1 comment

jank is currently using immer for persistent data structures: https://github.com/arximboldi/immer Very much inspired by Clojure, with a lot of time put into benchmarking and profiling. It's too early for me to share numbers on jank vs…

comment by Jeaye · 2022-08-17 · in The Jank Language: LLVM Hosted Clojure

…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]…

comment by dkersten · 2022-03-25 · in The Lisp Curse (2017)

…built my state model on the excellent immer[2] library. [1] https://github.com/inniyah/nanovg [2] https://github.com/arximboldi/immer

comment by vinkelhake · 2022-01-03 · in Tcl/Tk Spline Editor

…[](auto const& x){ /* ... */}); Transforming the contents of v requires a buffer(!) w. (The rescue: https://github.com/arximboldi/immer ) In Python, this would be something akin to: map(lambda x: x, t); # t being a tuple type here This…

comment by dankoncs · 2021-11-09 · in Ask HN: What language to learn after Python?

…make something like that (parsed using instaparse, type checked in Clojure, compiled to C++ using https://github.com/arximboldi/immer for the data structures), but haven't had the time to really get anywhere with it. Plus, even if I…

comment by dkersten · 2021-05-06 · in Six years of professional Clojure development

…tools for C++ and interactive software, some of which are used by big companies like Google: https://github.com/arximboldi/immer https://github.com/arximboldi/lager https://github.com/arximboldi/zug Also, I very agree with what @jasode has…

comment by arximboldi · 2021-03-11 · in Ask HN: Should I learn C++ in 2021?

…[4] https://users.rust-lang.org/t/persistent-data-structure-supp... [5] https://github.com/arximboldi/immer [6] https://github.com/orium/rpds [7] https://github.com/MagicStack/immutables [8] https://github.com/tobgu/pyrsistent

comment by je42 · 2020-12-07 · in These Modern Programming Languages Will Make You Suffer

…to jump ship until the alternatives check more boxes. [1] https://github.com/skypjack/entt [2] https://github.com/arximboldi/immer [3] https://www.youtube.com/watch?v=bMSrNBcir4Y&t=1757s

comment by dkersten · 2020-12-05 · in Std::visit is everything wrong with modern C++ (2017)

…world. Talk I https://youtu.be/sPhpelUfu8Q Talk II https://youtu.be/SAMR5GJ_GqA Data Structures: https://github.com/arximboldi/immer Application Structure: https://github.com/arximboldi/lager Text Editor: https://github.com/arximboldi/ewig…

comment by nightowl_games · 2020-12-02 · in Ask HN: What are the best advanced computer science courses online?

…cover some of the design and structure: https://github.com/arximboldi/ewig Libraries that it uses: https://github.com/arximboldi/immer https://github.com/arximboldi/lager

comment by arximboldi · 2020-10-28 · in Ask HN: Good C++ code bases to read?

There's a C++ implementation here: https://github.com/arximboldi/immer

comment by neutronicus · 2020-09-07 · in Hash Array Mapped Tries (HAMT) to the Rescue

…all the way through. I spend a lot of time building tools to make it easier, like for example: https://github.com/arximboldi/immer https://github.com/arximboldi/lager

comment by arximboldi · 2019-10-17 · in Why Isn't Functional Programming the Norm? [video]

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Immer is a library of persistent and immutable data structures written in C++

story by fortran77 · 2019-09-12 · 56 comments

…A rust implementation: https://docs.rs/im/13.0.0/im/ C++ implementation: https://github.com/arximboldi/immer The rust implemenation does a cool trick where the data is only copied when it is shared. If you are the sole owner of the

comment by AlexanderDhoore · 2019-08-04 · in How can List be faster than native arrays? (2018)

…should really have a look at Immer by Arximboldi (who is a user here on HN). Really amazing stuff: https://github.com/arximboldi/immer

comment by bjoli · 2018-04-06 · in Immutable.rs: immutable data structures for Rust

…SDL example: https://twitter.com/sinusoidalen/status/939539173584916480 Immutable data: https://github.com/arximboldi/immer (There was a talk about Lager at MeetingCpp this year, still waiting for it to be published online...)

comment by arximboldi · 2017-12-09 · in Git is a purely functional data structure (2013)

…some day I should write such Lisp myself on top of my C++ immutable data structures [1] :-) [1] https://github.com/arximboldi/immer

comment by arximboldi · 2017-11-26 · in Carp, a compiled Lisp with type inference and a borrow checker

…probably you'll get the urge to tell people about it. [1] Immutable data-structures for C++: https://github.com/arximboldi/immer Example usage: https://github.com/arximboldi/ewig [2] https://www.youtube.com/watch?v=sPhpelUfu8Q [3]…

comment by arximboldi · 2017-11-08 · in Ask HN: How much time do you spend on “marketing” your open source projects?

…video as well. It is all very cool, at least if you are not already spoiled by using clojure :) https://github.com/arximboldi/immer/blob/master/README.rst Edit: Forgot to mention: Ewig can be found among Immer's author Arximboldi's repos.…

comment by Johnny_Brahms · 2017-10-02 · in Text Editor: Data Structures

…@kostspielig her help writing and reviewieng the code! <3 [1] The data-structure can be found here: https://github.com/arximboldi/immer

comment by arximboldi · 2017-08-28 · in Lessons learned from implementing a text editor related to front-end development

…in C++, which also has experimental Python and Guile bindings: https://sinusoid.es/immer/ https://github.com/arximboldi/immer/ In the past I also did some other work on bringing Clojure Transducers to C++ (…

comment by arximboldi · 2017-08-04 · in Clojure will affect the way you think about programming

…edit a ~100MB file on a Raspberry --- larger files fail only due to excessive memory use :/). [1] https://github.com/arximboldi/immer

comment by arximboldi · 2017-04-17 · in Rope Science – Computer science concepts behind the Xi editor

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Immer: immutable and persistent data structures for C++

story by ingve · 2016-11-27 · 45 comments