json-validator/include/jvalidate/detail/string.h

#if __has_include(<unicode/std_string.h>)
#define JVALIDATE_HAS_ICU
#include <unicode/unistr.h>
#endif

namespace jvalidate::detail {
inline size_t length(std::string_view arg) {
#ifdef JVALIDATE_HAS_ICU
  icu::UnicodeString ucs = icu::UnicodeString::fromUTF8(icu::StringPiece(arg));
  return ucs.countChar32();
#else
  return arg.size();
#endif
}
}