multi_span＜...＞
summary
C++20 has span but common particle-system code shows a problem: interleaved arrays waste about 50% of cache when density ignores speed. Creating separate arrays fixes layout but forces passing two lengths. The solution is multi_span: a container of multiple typed spans that share one size and enforce equal length. It supports making from separate buffers, extracting individual spans, subslice all at once, and converting to a subset-of-types; it simplifies buffer-heavy code and works in practice.
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