CPPAlliance (@CPPAlliance) / X

CPPAlliance

222 posts

CPPAlliance

@CPPAlliance

Our mission is to make the C++ programming language accessible and useful to anyone who wishes to learn and apply the language.

Joined November 2017

CPPAlliance
@CPPAlliance
Jul 31
constexpr std::vector? Works. constexpr std::string? Works. constexpr placement new? "Not a constant expression" You could allocate at compile time, but you couldn't construct into that storage C++26 closes the last major gap in constexpr allocation 🧵👇
CPPAlliance
@CPPAlliance
Jul 30
The Linux kernel's most important concurrency primitive has been in production for 20+ years Readers never block. Writers make a copy, modify the copy, then atomically swap the pointer C++26 standardizes it as std::rcu 🧵👇
CPPAlliance
@CPPAlliance
Jul 29
Lock-free data structures have one hard problem: when can you safely delete a node that another thread might still be reading? Most solutions involve epoch counters, grace periods, or hand-rolled deferred destruction C++26 adds the technique that Facebook and the Linux kernel
CPPAlliance
@CPPAlliance
Jul 28
Matrix multiply in C++: Pull in Eigen? 300K lines of headers Link BLAS? Platform-specific build gymnastics Write it yourself? Good luck with cache locality C++26 puts linear algebra in the standard library 🧵👇
CPPAlliance
@CPPAlliance
Jul 27
std::function has a 13-year-old const-correctness bug: Its operator() is const, but it can call a non-const operator() on the stored callable C++26 adds the version that was correct from the start 🧵👇
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