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Practical Reflection With C++26 - Barry Revzin - CppCon 2025
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With the adoption of Reflection for C++26, the landscape of what is possible has shifted. This talk will focus on implementing Struct-of-Arrays for an arbitrary aggregate, but will also take some detours to cover some techniques that will prove useful for solving a wide range of problems. 
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Slides: https://github.com/CppCon/CppCon2025/blob/main/Presentations/Practical_Reflection.pdf

Work at Hudson River Trading (HRT): https://tinyurl.com/safxfctf
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Barry Revzin
 
Barry is a senior C++ developer at Jump Trading in Chicago, a technology and engineering-driven trading firm. After programming for many years, he got really into the nuances and intricacies of C++ by being unreasonably active on StackOverflow (where is he is the top contributor in every standard from C++14 up through C++26). A lot of his C++ knowledge comes from just answering questions that he doesn’t know the answers to, especially when he answers them incorrectly at first.

His C++ involvement escalated when he started attending standards committee meetings in 2016, having written dozens of papers for C++20, C++23, and now C++26. You might know him from such features as deducing this, packs in structured bindings, explicit(bool), conditionally trivial special member functions, packs in structured bindings, and now, reflection.

Outside of the C++ world, Barry is an obsessive swimming fan. He writes fun data articles for SwimSwam and also used to do analysis for the DC Trident, a professional swim team with multiple Olympic Gold Medalists (including Katie Ledecky and Natalie Coughlin).
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ISO C++ is the official website for the C++ programming language standardization committee, providing information, resources, and updates on the evolution of the C++ language. With a focus on language features, library enhancements, and standardization efforts, ISO C++ keeps developers informed about the latest developments in C++ programming. Developers can learn about upcoming language features, review proposals for language changes, and contribute to the evolution of the C++ language through active participation in the standardization process.

A deep dive into C++26 reflection, using a struct-of-arrays (SOA) vector implementation as the primary teaching vehicle. The talk covers the `define_aggregate` code generation mechanism, iterating over non-static data members, the `substitute`/`extract` pattern for working with type traits reflectively, expansion statements, `define_static_array`, annotations for opt-in behavior like a `derive_debug` formatter, and proxy types for mutable element access. Multiple approaches to iterating over members in parallel are shown, including pack expansion, expansion statements, tuple zip, and range-based zip. The talk demonstrates how reflection enables library authors to build zero-boilerplate, macro-free APIs that were previously impossible in standard C++.