immer
awesome-modern-cpp
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25 | 15 | |
2,417 | 11,304 | |
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6.7 | 3.5 | |
3 days ago | 3 months ago | |
C++ | HTML | |
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immer
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Text Editor Data Structures: Rethinking Undo
I've been working on an editor (not text) in C++ and pretty early got into undo/redo. I went down the route of doIt/undoIt for commands but that quickly got old. There was both the extra work needed to implement undo separately for every operation, but also the nagging feeling that the undo operation for some operation wasn't implemented correctly.
In the end, I switched to representing the entire document state using persistent data structures (using the immer library). This vastly simplified things and implementing undo/redo becomes absolutely trivial when using persistent data structures. It's probably not something that is suitable for all domains, but worth checking out.
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Show HN: A hash array-mapped trie implementation in C
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 in a general-purpose way. How does your implementation handle that?
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Text Editor Data Structures
You might 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 undoing/redoing in their prototype “ewig” text editor about 27 minutes into their talk here:
https://m.youtube.com/watch?v=sPhpelUfu8Q
It’s backed by a “vector of vectors” data structure called a relaxed radix balanced tree:
https://infoscience.epfl.ch/record/169879/files/RMTrees.pdf
That original paper has seen lots of attention and attempts at performance improvements, such as:
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value semantics and spans/views
You’re absolutely right, however people have been putting in the “extra efforts” required for efficiency. Check out immer if you’re interested.
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How to synchronize access to application data in multithreaded asio?
The C++ immer library: https://github.com/arximboldi/immer
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Purely Functional Data Structure by Chris Okasaki [pdf]
For C++ check this one out - https://github.com/arximboldi/immer
- Persistent and immutable data structures written in C++14
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Introducing B++ Trees, a C++ B+ Tree library
Yeah I agree that I should link that wikipedia page in the docs, I'll do that as soon as I get a chance. immer (https://github.com/arximboldi/immer) also links that page in its docs, for the exact same reason I'm sure. Interestingly, there is a lot of overlap between persistent data structures in the functional programming sense and persistent data structures in the persisted-to-disk sense because persistent data structures in the FP sense are one of the best ways to guarantee atomic updates and safe failure recovery in a persisted-to-disk system! Btrfs and ZFS, as well as many databases, are at their core basically just copy-on-write B+ trees.
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What are some architectural patterns for creating a game editor.
I’ve never tried it, but I love the idea of implementing editor scene state using immutable data structures like https://github.com/arximboldi/immer With that, every edit would append a new node to a list of scene states. Undo/redo becomes iterating your view of the scene up and down through that list. Can’t screw up an undo function if there’s never any work to do :P
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TypeScript Without Side Effects
I have! I think it's related to the C++ immer library which I used several years ago in Vortex. It's kinda like the previous generation of ValueScript. 🍻
awesome-modern-cpp
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Ask HN: What are great resources to catch up C++?
seriously, don't bother with c++. it will become irrelevant eventually.
but if you choose to ignore my advice, check[0] these[1]
- Melyek a "legjobb" programozási nyelvek karrier és lehetőségek szempontjából 2023-ban?
- Ask HN: Who is using C++ as the main language for new project?
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Tips for starting with c++ after python
I can't recommend a course in c++, but check out Awesome Modern C++
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Anything similar to the Odin project but for learning C++?
1) Some collections of interesting stuff are sometimes under "awesomexyz" on github. ( the one I included here probably isn't the _best for someone new to C++ but I'm including it anyway) * https://github.com/rigtorp/awesome-modern-cpp
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Random Weekly Discussion - December 31, 2021
https://awesomecpp.com/ compiled list of c++ resources, only be aware of these no need to crunch through all
- Best books and courses to learn C++?
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How does a real world look like?
If you want more repositories and references, check out this link: awesome-modern-cpp
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I know Python basics, what next?
This might help: https://github.com/rigtorp/awesome-modern-cpp/blob/master/README.md
- A guide to learn C++ by my own.
What are some alternatives?
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thonny - Python IDE for beginners
clj-kondo - Static analyzer and linter for Clojure code that sparks joy
notepad-plus-plus - Notepad++ official repository
graalvm-clojure - This project contains a set of "hello world" projects to verify which Clojure libraries do actually compile and produce native images under GraalVM.
windmap
ewig - The eternal text editor — Didactic Ersatz Emacs to show immutable data-structures and the single-atom architecture
LogicAndCodingGames - [Resource List] Programming-related games I'd like to try
deprecated-coalton-prototype - Coalton is (supposed to be) a dialect of ML embedded in Common Lisp.
py-must-watch - Must-watch videos about Python
libgit2 - A cross-platform, linkable library implementation of Git that you can use in your application.
project-based-learning - Curated list of project-based tutorials