Hello Boost community, I want to propose Boost.Multi, a modern C++ library for owning and non-owning multidimensional arrays with STL-compatible iteration, slicing, layout control, and lazy arrays/expressions. (The library requires at least C++17) I previewed the library on this mailing list before (see archives), but it is ready for review now and includes a couple of new features (such as lazy expressions, by popular demand) and much more comprehensive documentation. The library is built on current uses (at least two production codes) and on past experience (such as Boost.MultiArray, Blitz, Eigen, and std::mdspan). While mdspan provides a powerful non-owning view abstraction, Boost.Multi focuses on ownership, views, expressive multidimensional manipulation, and generic programming (STL-like iteration and algorithms, allocators, Ranges, Thrust). It is aimed at, but not limited to, numerical, scientific, and HPC-style workloads and emphasizes interoperability. The library has been in active use and refinement for some time, and it may now be ready for Boost review. I would be very grateful for: * Feedback on whether the library is suitable for Boost * Endorsements from those willing to support a formal review. I have an early endorsement from @Vinnie Falco, but additional endorsements are welcome * Guidance on the following steps to start the review process Repository: (Gitlab or Github mirrors, whatever you find more convenient) https://gitlab.com/correaa/boost-multi https://github.com/correaa/boost-multi Documentation: https://correaa.gitlab.io/boost-multi/multi.html https://correaa.github.io/boost-multi/multi.html If you encounter issues before a format review, the most efficient way would be to open an issue on GitLab or on GitHub: https://gitlab.com/correaa/boost-multi/-/issues https://github.com/correaa/boost-multi/issues Impatient? You can download the core library as a single header file https://correaa.gitlab.io/boost-multi/boost-multi.hpp (nightly updated) or try it in Godbolt: https://godbolt.org/z/KxGoP5Kq9 Want to check if it works with your favorite compiler? (probably it does, check compliance here: https://godbolt.org/z/fz6f6erq1) Want to test GPU capabilities? Please get in touch with me. What to chat? Join the Slack channel: https://cpplang.slack.com/archives/C071VGKUA5P Thank you all very much for your time and for maintaining such a valuable ecosystem. Best regards, Alfredo