C++26: std::is_within_lifetime
https://www.sandordargo.com/blog/2026/02/18/cpp26-std_is_within_lifetime

https://redd.it/1ragm1s
@r_cpp

I made a minimal SDL3 starter template with CMake and vcpkg — cross-platform, no bundled libs

Been doing C++ game dev for a while and got tired of setting up the same boilerplate every time I started a new SDL project. Put together a clean starter template with SDL3, SDL3_image, and SDL3_ttf managed via vcpkg so dependencies just work on Linux, macOS, and Windows.

Includes a basic SDLWindow class, hardware-accelerated renderer, and a game loop ready to go. Nothing fancy, just a solid starting point.

https://github.com/Tanner-Davison/sdl3-starter-template

Happy to answer questions about the setup or take feedback on the structure.

https://redd.it/1rajyp5
@r_cpp

BitFields API: Type-Safe Bit Packing for Lock-Free Data Structures
https://rocksdb.org/blog/2025/12/31/bit-fields-api.html

https://redd.it/1ra6tux
@r_cpp

Parallel C++ for Scientific Applications: Tasks & Concurrency (2nd Part)
https://www.youtube.com/watch?v=l-QUaAH_JJs

https://redd.it/1r9ulqk
@r_cpp

Problems with a weak tryLock operation in C and C++ standards
https://forums.swift.org/t/se-0512-document-that-mutex-withlockifavailable-cannot-spuriously-fail/84789/3

https://redd.it/1r94jgk
@r_cpp

MSVC Build Tools 14.51 Preview released
https://devblogs.microsoft.com/cppblog/microsoft-c-msvc-build-tools-v14-51-preview-released-how-to-opt-in/

https://redd.it/1r8ufqi
@r_cpp

Learn C++ by Example • Frances Buontempo & Matt Godbolt
https://youtu.be/PXKICIiXEUM?list=PLEx5khR4g7PJbSLmADahf0LOpTLifiCra

https://redd.it/1r8yslh
@r_cpp

Experimental adaptive sort - matches std::sort on random input, 2-8x faster on structured data

Hi all,

I’ve been developing an adaptive sorting algorithm, tentatively called **JesseSort**, which aims to exploit partial order in input data while still being competitive with standard library sorts on random input. I’m looking for feedback on design and potential adoption strategies.

# What it does

* Detects natural runs in the input (ascending, descending, or random) with a tiny lookahead.
* Maintains two sets of piles for ascending and descending runs, essentially a dual-patience sort.
* Falls back to tiny 8-value bitonic sort networks on detected random regions.
* When this random-input block is run too many times, it falls back to **std::sort**.
* Currently merges adjacent runs in a naive/bottom-up way.

# Current numbers

Median runtime ratios vs `std::sort` over 100 trials:

|Input Type|1k Values|10k|100k|1M|
|:-|:-|:-|:-|:-|
|Random|**0.984**|1.032|1.042|1.088|
|Sorted|1.022|**0.679**|**0.583**|1.448?|
|Reverse|1.636|1.076|**0.900**|2.101?|
|Sorted+Noise(5%)|1.048|1.041|1.079|1.201|
|Random+Repeats(50%)|1.037|1.032|1.031|1.089|
|Jitter|1.012|**0.674**|**0.586**|1.443?|
|Alternating|**0.829**|1.011|**0.974**|1.018|
|Sawtooth|1.121|**0.960**|**0.978**|1.072|
|BlockSorted|1.046|**0.950**|**0.928**|1.153|
|OrganPipe|**0.446**|**0.232**|**0.138**|**0.268**|
|Rotated|**0.596**|**0.522**|**0.396**|**0.716**|
|Signal|1.402|**0.828**|**0.659**|**0.582**|

**Notes:**

* Ratios are `JesseSort` / `std::sort`. **Values <1 indicate JesseSort is faster.** 0.5 means JesseSort takes half the time (2x faster). 2.0 means JesseSort takes twice as much time (2x slower).
* Large input blow-ups (`?`) appear to be outliers on my machine, but would be curious to see if others see the same pattern.

# Current issues / questions

1. **Handoff threshold:** Detecting random input too early loses semi-structured gains; too late slows random input. How should this balance be tuned?
2. **Fallback vs. std::sort:** Could JesseSort itself (dual patience games) serve as a better fallback than heap sort in standard introsort implementations?
3. **Merge optimizations:** Current merge is bottom-up adjacent. I’ve prototyped a TimSort-style merge that merges smaller runs first. Minor speedups in most cases but I haven't tested it enough.
4. **Memory layout & cache:** Some sensitivity to variable placement and data alignment is noticeable. Any advice for robust layout-sensitive optimizations?
5. **Real-world adoption:** Even if slightly slower on purely random input (\~5%), the structured input gains are often >50%. Would such an algorithm be worth promoting or considered niche? If the hit to random input is too significant, maybe this would find a better home as an alternative like `std::structured_sort`?

I’m looking for input on:

* Algorithmic improvements, especially for the random vs structured handoff
* Practical concerns for integration into standard libraries
* Benchmark methodology for mixed input distributions
* Real-world test datasets that might showcase advantages

Code and full details are available here: [https://github.com/lewj85/jessesort](https://github.com/lewj85/jessesort)

Thanks

https://redd.it/1r8n7vi
@r_cpp

Apache Fory C++: Fast Serialization with Shared/Circular Reference Tracking, Polymorphism, Schema Evolutionn and up to 12x Faster Than Protobuf

We just released Apache Fory Serialization support for c++:

https://fory.apache.org/blog/fory\_cpp\_blazing\_fast\_serialization\_framework

Highlights:

1. Automatic idiomatic cross-language serializaton: no adapter layer, serialize in C++, deserialize in Python.
2. Polymorphism via smart pointers: Fory detects std::is_polymorphic<T> automatically. Serialize through a shared_ptr<Animal>, get a Dog back.
3. Circular/shared reference tracking: Shared objects are serialized once and encoded as back-references. Cycles don't overflow the stack.
4. Schema evolution: Compatible mode matches fields by name/id, not position. Add fields on one side without coordinating deployments.
5. IDL compiler (optional): foryc ecommerce.fdl --cpp_out ./gen generates idiomatic code for every language from one schema. Generated code can be used as domain objects directly
6. 6. Row format: O(1) random field access by index, useful for analytics workloads where you only read a few fields per record.

Throughput vs. Protobuf: up to 12x depending on workload.

GitHub: https://github.com/apache/fory

C++ docs: https://fory.apache.org/docs/guide/cpp

I’d really like critical feedback on API ergonomics, and production fit.

https://redd.it/1r8a0zt
@r_cpp

Implementing your own asynchronous runtime for C++ coroutines

Hi all! Last time I wrote a blog post about writing your own C++ coroutines. Now, I wanted to highlight how to write your own C++ asynchronous runtime for your coroutines.

https://rhidian-server.com/how-to-create-your-own-asynchronous-runtime-in-c/


Thanks for reading, and let me know if you have any comments!

https://redd.it/1ratu13
@r_cpp

Serialization by contract and IPC
https://github.com/amarmer/SerializationByContract

https://redd.it/1rb2yes
@r_cpp

C++26 Reflection + PyBind11 for algo trading
https://github.com/profitviews/merton-market-maker

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