0f7cd5e573
This change reorders the data members of std::span so that span<byte> is layout-compatible with common implementations of struct iovec. This will allow span<byte> to be used directly in places that use a struct iovec to do scatter-gather I/O. It's important to note that POSIX doesn't specify the order of members in iovec. Also the equivalent type on Windows has members in the other order, and uses type ULONG (which is always 32-bit whereas size_t is 64-bit for Win64). So this change will only help for certain targets and an indirection between std::span and I/O system calls will still be needed for the general case. libstdc++-v3/ChangeLog: PR libstdc++/95609 * include/std/span (span): Reorder data members to match common implementations of struct iovec. * testsuite/23_containers/span/layout_compat.cc: New test. |
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