How to Tame Packs, std::tuple, and the Wily std::integer_sequence - Andrei Alexandrescu

https://cppcon.org
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How to Tame Packs, std::tuple, and the Wily std::integer_sequence - Andrei Alexandrescu - CppCon 2025
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Template parameter packs and std::tuple unlock powerful metaprogramming capabilities in C++, but they also introduce a parallel sublanguage—one with unfamiliar rules, verbose idioms, and surprising limitations. Packs were originally designed for perfect forwarding, not compile-time iteration, which makes even simple tasks like filtering or transformation awkward. std::integer_sequence helps, but mostly by shifting the burden rather than removing it.

Existing library utilities offer some relief, but often feel inconsistent and difficult to compose. This talk explores why working with packs and tuples feels harder than it should, and demonstrates a small set of clean, reusable abstractions that make these tasks simpler, safer, and more expressive. Attendees will leave with practical tools—(and, with luck, a renewed hope) that structured metaprogramming in C++ doesn't have to be so hard.

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Slides: https://github.com/CppCon/CppCon2025/...

Work at Hudson River Trading (HRT): https://tinyurl.com/safxfctf
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Andrei Alexandrescu

Andrei Alexandrescu is a Principal Research Scientist at NVIDIA. He wrote three best-selling books on programming (Modern C++ Design, C++ Coding Standards, and The D Programming Language) and numerous articles and papers on wide-ranging topics from programming to language design to Machine Learning to Natural Language Processing to fundamental algorithms. Andrei holds a PhD in Computer Science from the University of Washington and a BSc in Electrical Engineering from University ""Politehnica"" Bucharest. He is the Vice President of the D Language Foundation.
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