12 #if __has_include(<span>) && __cpp_lib_span >= 202002L
19 using ::std::make_span;
21 using ::std::as_bytes;
22 using ::std::as_writable_bytes;
23 using ::std::dynamic_extent;
29 #include <cras_cpp_common/external/tcb/span.hpp>
34 using ::tcb::make_span;
36 using ::tcb::as_bytes;
37 using ::tcb::as_writable_bytes;
38 using ::tcb::dynamic_extent;