C++ 20 named modules with clang-cl is finally added in CMake 4.4

I've been using named modules in my hobby C++ projects for years but they always trigger some unexpected ICEs when I used MSVC, and I got really tired of experimenting workarounds. After I switched to clang-cl recently, all the related problems I've encountered so far were resolved. The only thing missing now is import std

https://redd.it/1v1hq9a
@r_cpp

Żmij 1.1 released with fixed notation support, up to 38% faster double-to-string conversion, SIMD-optimized float formatting, a smaller binary footprint and more

https://github.com/vitaut/zmij/releases/tag/v1.1

https://redd.it/1v1ljec
@r_cpp

New C++ Conference Videos Released This Month - July 2026 (Updated to Include Videos Released 2026-07-13 - 2026-07-19)

**C++Now**

2026-07-13 - 2026-07-19

* Keynote: Benchmarking - It's About Time - Matt Godbolt - [https://youtu.be/EU\_nQh8wg5A](https://youtu.be/EU_nQh8wg5A)
* The Morning Briefing - C++ Concurrency Before the Hardware Reckoning - Fedor Pikus - [https://youtu.be/WtChBezurj8](https://youtu.be/WtChBezurj8)
* Lock-free Programming is Dead - Long Live Lock-free Programming! - Fedor G Pikus - [https://youtu.be/UdKqfQ3a\_sY](https://youtu.be/UdKqfQ3a_sY)

2026-07-06- 2026-07-12

* Keynote: Reflection Is Only Half the Story - Barry Revzin - [https://youtu.be/DZTkT1Cq\_aY](https://youtu.be/DZTkT1Cq_aY)
* Keynote: Multidimensional Parallel Standard C++ - Mark Hoemmen - [https://youtu.be/VAwW\_s1uEHY](https://youtu.be/VAwW_s1uEHY)

**C++Online**

2026-07-13 - 2026-07-19

* C++ Contracts - A Meaningfully Viable Product, Part II - Andrei Zissu - [https://youtu.be/1VUqOx6PCMU](https://youtu.be/1VUqOx6PCMU)
* Sanitize it Before You Ship IT - Vishnu Nath - [https://youtu.be/jzcGATR78Mk](https://youtu.be/jzcGATR78Mk)

2026-07-06 - 2026-07-12

* Time to Introspect - A Beginner's Guide to Practical Reflection - Sarthak Sehgal - [https://youtu.be/9stn1o149pw](https://youtu.be/9stn1o149pw)
* Refactoring Towards Structured Concurrency - Roi Barkan - [https://youtu.be/6502xFEreI8](https://youtu.be/6502xFEreI8)

2026-06-29 - 2026-07-05

* Why std::vector Can't Save You (And What to Use Next) - Kevin Carpenter - [https://youtu.be/78fYPix0mN4](https://youtu.be/78fYPix0mN4)
* Modern C++ for Embedded Systems - From Fundamentals To Real-Time Solutions - Rutvij Karkhanis - [https://youtu.be/XxeqHRDhHkU](https://youtu.be/XxeqHRDhHkU)

**ADC**

2026-07-13 - 2026-07-19

* Building Inclusive Audio Tools - Accessibility with ARIA, WCAG, and Real-World Projects - Samuel John Prouse & David Shervill - [https://youtu.be/O5xX9a7P-SU](https://youtu.be/O5xX9a7P-SU)
* PSD to DAW - Building a Pixel-Perfect UI Pipeline - Bence Kovács - [https://youtu.be/hebLkAR5X3I](https://youtu.be/hebLkAR5X3I)
* Analog Filters for Realtime Audio - George Gkountouras - [https://youtu.be/NLt0NqUtNLo](https://youtu.be/NLt0NqUtNLo)
* A History of FLAC - The Free Lossless Audio Codec - Josh Coalson - [https://youtu.be/tBb1STRW56s](https://youtu.be/tBb1STRW56s)

2026-07-06 - 2026-07-12

* Workshop: Audio Plugin DSP in Practice - Jan Wilczek & Linus Corneliusson - [https://youtu.be/Atc0GRWoolI](https://youtu.be/Atc0GRWoolI)
* An Open Toolkit for Real-Time Audio Descriptors - Valerio Orlandini - [https://youtu.be/HKlnn0hd8J0](https://youtu.be/HKlnn0hd8J0)
* Bugs I’ve Seen in the Wild - From Confusion to Amazement - Olivier Petit - [https://youtu.be/LBWtb\_uXt0I](https://youtu.be/LBWtb_uXt0I)
* Real-Time Audio in Python: Introducing the asmu Package - Felix Huber - [https://youtu.be/X2vr81CJ934](https://youtu.be/X2vr81CJ934)

2026-06-29 - 2026-07-05

* Beyond iLok: Advanced Code Protection and Cryptography for the Next Generation - Protecting the Next Generation of Applications, Plug-ins, and AI Models - Neal Michie, Ryan Wardell & Bob Brown - [https://youtu.be/dbbK\_ry2cgo](https://youtu.be/dbbK_ry2cgo)
* Database Synchronisation for Audio Plugins, Part Two - Here's One I Made Earlier - Adam Wilson - [https://youtu.be/wJCy2G969ro](https://youtu.be/wJCy2G969ro)
* Perfect Oscillators in Less Than One Clock Cycle - Angus Hewlett - [https://youtu.be/Ssq0a-YdamM](https://youtu.be/Ssq0a-YdamM)
* Driving Chaos - Virtual Analog Modelling of a Chaotic Circuit with Wave Digital Filters - Francisco Bernardo - [https://youtu.be/PnEZNqyKlIw](https://youtu.be/PnEZNqyKlIw)

**Boost Documentary**

There is also a teaser trailer for a new documentary on the history of the Boost C++ library [https://www.youtube.com/watch?v=87jvuDbnwqQ](https://www.youtube.com/watch?v=87jvuDbnwqQ) which will have its first showing at CppCon this year

https://redd.it/1v1p3nc
@r_cpp

C++26: what is “template for”? Learning with simple example.
https://techfortalk.co.uk/2026/07/20/c26-what-is-template-for/

https://redd.it/1v1zd2c
@r_cpp

Pure Virtual C++ 2026: MSVC, are we there yet? Status of C++23 and C++26 features
https://youtu.be/ZHsQ58ROEhI?si=WMidU5yfCGH3958U

https://redd.it/1v2bmeu
@r_cpp

Good web site/GitHub repo for practice

Hi everyone,

I'm looking for one good web site with coding exercises for practice c++.

Ofc I know that Leetcode/Codeforces is good but I'm looking for web sites where I can practice all topics of c++ from OOP to concurrent and parallel programming.

Good thing will be if you know for some sites where you get code snippet and then need to predict output/what is error.

https://redd.it/1v2idr3
@r_cpp

Is there something like a VM to wrap tools such as LLVM IRBuilder?

I'm working on a lightweight embedded scripting language for C++ applications. This is intended for modest extensions to the applications themselves, such as adding context-menu options to GUI controls (scripts are handlers for when the option is activated); parsers for loading data in custom serialization formats (scripts might be pairs of regex rules with match callbacks); or statistical analyses for data sets. The language has a VM which aims to be almost trivial, or at least have a minimal working core -- mostly instructions to build up a parameter list and call C++ code via function pointers. One of my goals is to minimize the distinction between calling C++ functions from a host application versus methods that implement basic language elements, like declaring/initializing variables, managing lexical scopes and variable lifetimes, and branching/loop blocks. For instance, instead of "jump" instructions if/else could be implemented as a C++ function whose second argument is an object encapsulating a code block.

My question is as follows: with this setup I am researching the feasibility of transpiling to C++ files rather than executing scripts immediately. For the basic language I seek to minimize heavy dependencies like LLVM (leaning more toward a much smaller infrastructure, like LuaVM). But I would accept external dependencies for optional extensions.

Generating C++ code directly via something like std::stringstream seems pretty awkward. I've read about Jank's IR from which C++ code is produced (and then, I believe, compiled immediately via Clang). Perhaps Gabriel dos Reis's IPR could be used to similar effect. Instead of compiling \*to\* IR, generate IR and decompile to C++ source code.

But since my compiler pipeline is designed to emit VM code, I'm hoping some tools might exist for which IR is more akin to instructions in some special-purpose bytecode format. Functionally, I'm envisioning something like LLVM IRBuilder, where code-generation is decomposed into lots of small actions (add some token to an argument list, open/close some code block, etc.). Even just a wrapper around IRBuilder might work. But what I hope to find is a sort of DSL where various IRBuilder methods (or the equivalent) could be written in sequence, one-line-per-instruction style. One thing confusing me is that online discussions about .ll files "decompiling" to C++ aren't clear as to whether the goal is generating IRBuilder code that would produce the equivalent .ll code, or conversely reconstructing the actual C++ originally written. Substantially though I'm not sure how much it matters. Here's what AI spits out as a simple IRBuilder example:

Type* Int32Ty = Type::getInt32Ty(Context);
std::vector<Type*> ParamTypes = {Int32Ty, Int32Ty};
FunctionType *FuncType = FunctionType::get(Int32Ty, ParamTypes, false);
Function *AddFunc = Function::Create(FuncType, Function::ExternalLinkage, "add", OwnerModule.get());
Function::arg_iterator Args = AddFunc->arg_begin();
Value* ArgA = Args++;
ArgA->setName("a");
Value* ArgB = Args;
ArgB->setName("b");

I could certainly envision an interface like this to produce equivalent C++ code:

int32_t add(int32_t a, int32_t b)

and so forth. But it would be excellent if the IRBuilder code could be replaced by something more VM-like:

init-arg-list
add-param-type @Int32Ty
add-param-type @Int32Ty
add-return-type @Int32Ty
reset-arg-cursor
set-arg-name "a"
inc-arg-cursor
set-arg-name "b"
inc-arg-cursor
set-proc-name "add"
write-function-signature

or something like that (imagining a "@" sigil on type names). The point is that the above lines might be pretty close to VM code intended to call the "add" function at runtime, so you could use the same compiler toolchain for multiple steps before generating one kind of code for runtime scripts and a different VM flavor for producing C++ source files.

I don't think there's any

LLVM target that works this way. But perhaps some third-party library?

https://redd.it/1v2nw60
@r_cpp

boost::int128 review starts today (July 22 - July 31)

Announced officially on the [Boost mailing list](https://lists.boost.org/archives/list/[email protected]/thread/GLZALH3WRHSICP6ZYOFDOPWUQTJUKOM5/)

**Introduction**

The formal review of Matt Borland's `boost::int128` for inclusion in the Boost libraries, starts today.

Int128 is a portable C++14 implementation of signed and unsigned 128-bit integers. It has no dependencies, is header-only, and can be consumed as a module in C++20. It serves as a practical solution to the partial (resp. absent) support of 128-bit integers by gcc/clang (resp. msvc), and as a lightweight alternative to heavier projects.

You can find the library and its documentation here:
\- [https://github.com/cppalliance/int128/tree/boost\_review](https://github.com/cppalliance/int128/tree/boost_review)
\- [https://develop.int128.cpp.al/overview.html](https://develop.int128.cpp.al/overview.html)
\- Compiler Explorer: [https://godbolt.org/z/5aM6K9b4r](https://godbolt.org/z/5aM6K9b4r)

Although possibly not faithful to Matt's implementation, this CE link will be handy if you are in a rush but want to play with the library.

Anyone is welcome to post a review and/or take part in subsequent discussions in the mailing list.

**Review guidelines**

Please provide feedback on the following general topics:

* What is your evaluation of the design?
* What is your evaluation of the implementation?
* What is your evaluation of the documentation?
* What is your evaluation of the potential usefulness of the library?
* Did you try to use the library? With which compiler(s)? Did you have any problems?
* How much effort did you put into your evaluation? A glance? A quick reading? In-depth study?
* Are you knowledgeable about the problem domain?

Ensure to explicitly include with your review: ACCEPT, REJECT, or CONDITIONAL ACCEPT (with acceptance conditions).

Thank you for your time making our OSS ecosystem better. Happy to start the discussions!

Arnaud Becheler (Review Manager)

https://redd.it/1v3duby
@r_cpp

I implemented Smart Pointers from scratch in C++ (UniquePtr, SharedPtr & WeakPtr)

I’ve been trying to spend more time building things from scratch instead of just reading about them.
My latest project was implementing UniquePtr, SharedPtr, and WeakPtr in C++ with reference counting.
It ended up being much more interesting than I expected. Small mistakes in reference counting quickly turned into bugs like memory leaks, double-free, and use-after-free, which made me appreciate the standard library implementation even more.
Current status:
UniquePtr
SharedPtr
WeakPtr
Reference counting
18/18 test cases passing
Repository:
https://github.com/574-jayeshSh/smart-pointer-library
I’d love to hear feedback from people who’ve implemented something similar or suggestions on what I should improve next.

https://redd.it/1v3m5k5
@r_cpp

Pure Virtual C++ Videos Are Now Available
https://devblogs.microsoft.com/cppblog/pure-virtual-c-2026-is-a-wrap/

https://redd.it/1v3myfh
@r_cpp

Project A backend-agnostic C++17 document intelligence pipeline with measurable OCR, layout and table stages

I have been working on an early-stage open-source document intelligence engine in C++17.



The goal is not to own every OCR or layout model. The core keeps typed pipeline boundaries and normalizes PDF text, OCR, layout blocks, tables, reading order, coordinates, confidence and provenance into a stable document model.



Current components include:



\- PDFium rendering and native text

\- PaddleOCR ONNX and optional Tesseract

\- RF-DETR DocLayNet and Paddle PP-DocLayoutV3

\- Table Transformer detection and structure recognition

\- JSON/Markdown/HTML output

\- small public regression datasets

\- an optional FastAPI/Redis Streams/persistent C++ Worker/React inspection platform



It is still an alpha. The current small benchmark subsets are regression checks, not production accuracy claims.



I am looking for contributors interested in C++ architecture, ONNX session reuse, OCR/CV evaluation, Redis Streams recovery, reading order, or Web-based bounding-box diagnostics.



Repository:

https://github.com/ChNanAn/technical-doc-parser

https://redd.it/1v41u7b
@r_cpp

Fil-C: Garbage In, Memory Safety Out! - Filip Pizlo | SSW 2026
https://www.youtube.com/watch?v=5F-2Y1LPRek

https://redd.it/1v4nw0k
@r_cpp

The portable way to extract date and time from a file's mtime in C++
https://sandordargo.com/blog/2026/07/22/extracting-datetime-from-mtime

https://redd.it/1v4w4h3
@r_cpp

State of "moved-from" objects

Hi, I recently decided to try writing a C++ blog.

I often see the popular claim that moved-from objects are in a "valid but otherwise unspecified state", but I don't think that statement is entirely precise, and my blog post is about that.
I would really appreciate any feedback!

Article: https://www.laminowany.dev/p/the-state-of-moved-from-objects-in-c/

https://redd.it/1v4r2gb
@r_cpp