Function normalize_libcxx_inline_namespaces

include/fmt/std.h:167–194

#if FMT_USE_RTTI
inline auto normalize_libcxx_inline_namespaces(string_view demangled_name_view,
                                               char* begin) -> string_view {
  // Normalization of stdlib inline namespace names.
  // libc++ inline namespaces.
  //  std::__1::*       -> std::*
  //  std::__1::__fs::* -> std::*
  // libstdc++ inline namespaces.
  //  std::__cxx11::*             -> std::*
  //  std::filesystem::__cxx11::* -> std::filesystem::*
  if (demangled_name_view.starts_with("std::")) {
    char* to = begin + 5;  // std::
    for (const char *from = to, *end = begin + demangled_name_view.size();
         from < end;) {
      // This is safe, because demangled_name is NUL-terminated.
      if (from[0] == '_' && from[1] == '_') {
        const char* next = from + 1;
        while (next < end && *next != ':') next++;
        if (next[0] == ':' && next[1] == ':') {
          from = next + 2;
          continue;
        }
      }
      *to++ = *from++;
    }
    demangled_name_view = {begin, detail::to_unsigned(to - begin)};
  }
  return demangled_name_view;
}

template <class OutputIt>
auto normalize_msvc_abi_name(string_view abi_name_view, OutputIt out)