New features in GCC 16: Improved error messages and SARIF output
https://developers.redhat.com/articles/2026/04/28/gcc-16-improved-error-messages-sarif-output

https://redd.it/1sy031g
@r_cpp

Things C++26 define_static_array can’t do
https://quuxplusone.github.io/blog/2026/04/24/define-static-array/

https://redd.it/1syc79o
@r_cpp

A Principal Software Engineer at Epic Games / 25 Year Vet, talks about why AI is just a "giant switchboard" and why code is a delicate crystal.

I’ve been thinking a lot about how people actually get comfortable with complex topics like programming, not by tutorials, but by just being passively around the conversations.

So I recorded one of those conversations.

I sat down with Dietmar Hauser (25+ years in the industry, Principal Software Engineer at Epic), and we went from Commodore 64 days, literally typing code out of magazines. All the way to modern C++ and where we find ourselves at the moment with another layer of abstraction = LLMs.

What stuck with me wasn’t just the history, but how he talks about coding as this fragile, interconnected system (“a delicate crystal”), that shatters if you touch the wrong thing, which i found very interesting.

It’s a long, unfiltered discussion, more like something you overhear between two people deep in the field than a structured interview.

If you’re trying to get a feel for how experienced engineers actually think about code, or if you wanna warm up to the idea, this convo might be useful:
https://youtu.be/PE3aCgSHvTQ

https://redd.it/1syd309
@r_cpp

boost::container::hub ACCEPTED into Boost

Hi to all, I'm glad to announce that the proposed boost::container::hub container has been ACCEPTED. Congrats u/joaquintides !

More details here:

https://lists.boost.org/archives/list/[email protected]/thread/7WZ7QTPE2YDYD5OYCKXKKV2N74JHJRZL/

Reminder:

hub is a sequence container with O(1) insertion and erasure and element stability with great performance (see these benchmarks): pointers/iterators to an element remain valid as long as the element is not erased. hub is very similar but not entirely equivalent to C++26 std::hive (hence the different naming, consult the section "Comparison with std::hive" for details).

https://redd.it/1sycrw7
@r_cpp

I tried compile-time heapsort in TMP. It basically became selection sort.

Tried implementing compile-time sorting with old-school TMP (recursive templates, no constexpr). Yeah, constexpr sort exists now, but I wanted to see how far pure template recursion could go. Quicksort and mergesort worked fine. Heapsort was the one that broke.

Then it clicked: heapsort assumes cheap random access. Parent node, left child, right child, all index arithmetic. But in a typelist like arr<5, 3, 8, 1> there's no arr[i]. Every element access peels the head off recursively, so it's O(n) per lookup. Heapify becomes expensive, sift-down becomes expensive, and the whole thing degrades.

What I actually ended up with was... selection sort. Find the min by scanning the whole list, pull it out, recurse. O(n²) template instantiations. Not great.

Quicksort doesn't have this problem because it just filters into two sublists (less-than pivot, greater-than pivot). No indexing needed. Mergesort splits with take/drop which is O(n) but only happens once per level, so it stays O(n log n) overall.

I didn't really clock the random access dependency until I was halfway through writing the heap version. Felt kind of dumb in retrospect. Never really felt how much big-O depends on the data structure until TMP took away my arrays.

Full code in comments if anyone wants to look at it. Fair warning the mergesort lives in namespace www because I was iterating on these in separate files and never bothered renaming.

Anyone else run into algorithms that stop making sense in TMP?


https://redd.it/1syqjdu
@r_cpp

atomic_queue benchmarks SMT vs no-SMT performance
https://max0x7ba.github.io/atomic_queue/html/benchmarks.html

https://redd.it/1syrt4e
@r_cpp

Discussion: Using Python as a control plane for high-performance systems - Is the overhead of the C-API still the main bottleneck?

Hi everyone,

I’ve been working on a high-performance infrastructure project where the core data engines are written in Rust and C++ (using Polars and custom C-style binary protocols), but the orchestration and business logic are handled by Python 3.13+.

In the C++ world, we often avoid Python for anything "mission-critical" due to the GIL and the overhead of the Python C-API. However, I’ve been experimenting with a Shared Memory IPC approach to decouple the high-level logic from the data plane.

I’d love to get some feedback from the C++ community on this architecture:

1. Zero-Copy IPC via Shared Memory: Instead of using Protobuf or JSON over a socket, I'm allocating segments in the Windows Kernel and using struct packing to write raw bytes. For those of you building C++ engines that need to talk to high-level "glue" languages, do you still prefer Unix Domain Sockets/Named Pipes, or has Shared Memory become your standard?
2. Memory Alignment and Padding: When interfacing Python’s struct module (C-style) with C++ structs, I've had to be extremely careful with Little Endianness and memory alignment. Is there a more robust way to handle this without bringing in heavy dependencies like FlatBuffers?
3. CPU Affinity: I'm pinning the Python consumer to specific cores to avoid context switching when reading from the shared buffer. In a hybrid system, do you usually reserve specific cores for the C++ engine and leave others for the management scripts, or do you let the OS scheduler handle it?

The Goal:

I'm trying to build a system where Python handles the "thinking" (logic/orchestration) while the "doing" (I/O and computation) happens at $O(1)$ or $O(\\log n)$ at the hardware level.

I'm curious: What is your "threshold" for moving a component out of Python/Go and into pure C++? Is it strictly latency, or is it about memory safety and deterministic behavior?

https://redd.it/1syrus9
@r_cpp

learncpp. com not online anymore

I can't seem to get in the site learncpp.com anymore.

Anyone else with the same issue?

Do you have any suggestions for a similar site where i can learn cpp, I am a complete novice trying to learn cpp after C (still learning C)

https://redd.it/1syvxrb
@r_cpp

Build a simple and yet powerful TUI file-organizer (forg?)

And Yes, i know, organizing can quit your searching. But I'm constantly nerved down to my bones (don't know how to bring this in proper english) when I'm looking at my /Downloads, /Documents, /Active_Projects, /AnythingAtAll and still find a lot of stuff in it after some days of intensive work at my lap.... Aaargh...I think often by myself.

So here it is. Simple OSX/Linux Tool with TUI ...everything lined up in your /Organized.... (configurable of 'cause)

May it be useful. For you as it is already for me.

FREE at all. clone...compile...have fun.... cheers...

github: https://github.com/SaschaKohler/file-organizer

https://redd.it/1sywf3f
@r_cpp

Custom shell i have been working on

hi i have been working on this shell for some time and i though of getting some feedback, note that i still am working on the project : https://github.com/Indective/Ish

https://redd.it/1sz22ws
@r_cpp

Cpp Files Still Help Breaking Build Dependencies of Modules
https://abuehl.github.io/2026/04/23/cpp-files-still-help-breaking-dependencies.html

https://redd.it/1sz5a9o
@r_cpp

ACAV v1.0.0: an open-source GUI tool for exploring Clang ASTs in C/C++ projects

I am the author of ACAV, the Aurora Clang AST Viewer, and I have just made the first public release, v1.0.0.

ACAV is an open-source Qt desktop application for exploring Clang ASTs in C, C++, Objective-C, and Objective-C++ projects that provide a `compile_commands.json` compilation database.

It supports source-to-AST navigation, AST-node search, source-code search, declaration-context views, selected-subtree JSON export, and background AST generation/caching.



Links:

\- GitHub: https://github.com/uvic-aurora/acav

\- Release: https://github.com/uvic-aurora/acav/releases/tag/v1.0.0

\- Manual: https://uvic-aurora.github.io/acav-manual/index.html

\- Demo video: https://youtu.be/0M7dYAlnrTI

There are also prebuilt Docker/Podman demo images for LLVM 20, 21, and 22.

https://github.com/uvic-aurora/acav/pkgs/container/acav


I would appreciate feedback from C++ users, especially anyone who works with Clang tooling or wants a more visual way to inspect ASTs.





https://redd.it/1sz6w3w
@r_cpp

Why C++ Is Growing and What C++26 Means for Production Systems
https://www.youtube.com/watch?v=Qvr9MTAU_y4

https://redd.it/1szbl25
@r_cpp

What do you think is a keyword that should be added to C++?



https://redd.it/1szgavx
@r_cpp

CPP* Compiler Project *Almost Too Good To Be True
https://github.com/LukeSchoen/CPrime

https://redd.it/1szi16y
@r_cpp

GCC 16.1 released with many new C++26/23 features, C++20 now the default stable language version
https://gcc.gnu.org/gcc-16/changes.html#cxx

https://redd.it/1szveq3
@r_cpp

Some theory and practice of alignment in C++ (guide part 3).
https://pvs-studio.com/en/blog/posts/cpp/1369/

https://redd.it/1szx3m5
@r_cpp

Working on a new language (vibe-compiler) – Looking for feedback on my C++23 Lexer/Parser

Hey everyone,

I've been working on a custom programming language called vibe-compiler. It's a low-level project built with C++23.


I want to learn more about how can I built a OOP in my custom language. I'm following the www.craftinginterpreters.com . I'd love some feedback on my approach to naming convention and how can i improve the project. Also, if anyone is interested in contributing or just chatting about compiler design, I'd love to connect!

This is the GitHub repo: https://github.com/gemrey13/vibe-compiler

https://redd.it/1szwqdg
@r_cpp

C++26: string and string_view improvements
https://www.sandordargo.com/blog/2026/04/29/cpp26-string-string_view-improvements

https://redd.it/1t02001
@r_cpp

Fast GPU Linear Algebra via Compile Time Expression Fusion
https://arxiv.org/abs/2604.22242

https://redd.it/1t01hj5
@r_cpp