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Merge bitcoin#18468: Span improvements
26acc8d Add sanity check asserts to span when -DDEBUG (Pieter Wuille) 2676aea Simplify usage of Span in several places (Pieter Wuille) ab303a1 Add Span constructors for arrays and vectors (Pieter Wuille) bb3d38f Make pointer-based Span construction safer (Pieter Wuille) 1f790a1 Make Span size type unsigned (Pieter Wuille) Pull request description: This improves our Span class by making it closer to the C++20 `std::span` one: * ~~Support conversion between compatible Spans (e.g. `Span<char>` to `Span<const char>`).~~ (done in bitcoin#18591) * Make the size type `std::size_t` rather than `std::ptrdiff_t` (the C++20 one underwent the same change). * Support construction of Spans directly from arrays, `std::string`s, `std::array`s, `std::vector`s, `prevector`s, ... (for all but arrays, this only works for const containers to prevent surprises). And then make use of those improvements in various call sites. I realize the template magic used looks scary, but it's only needed to make overload resultion make the right choices. Note that the operations done on values are all extremely simple: no casts, explicit conversions, or warning-silencing constructions. That should hopefully make it simpler to review. ACKs for top commit: laanwj: Code review ACK 26acc8d promag: Code review ACK 26acc8d. Tree-SHA512: 5a5bd346a140edf782b5b3b3f04d9160c7b9e9def35159814a07780ab1dd352545b88d3cc491e0f80d161f829c49ebfb952fddc9180f1a56f1257aa51f38788a
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