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25#ifndef ZYPPNG_BASE_SPAN_H
26#define ZYPPNG_BASE_SPAN_H
30#if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L && !defined(ZYPPNG_FORCE_TCB_SPAN)
34 using std::dynamic_extent;
37# include <tcb/span.hpp>
40 using tcb::dynamic_extent;