Function write_demangled_name

include/fmt/std.h:221–254

template <typename OutputIt>
auto write_demangled_name(OutputIt out, const std::type_info& ti) -> OutputIt {
#  ifdef FMT_HAS_ABI_CXA_DEMANGLE
  int status = 0;
  size_t size = 0;
  std::unique_ptr<char, void (*)(void*)> demangled_name_ptr(
      abi::__cxa_demangle(ti.name(), nullptr, &size, &status), &free);

  string_view demangled_name_view;
  if (demangled_name_ptr) {
    demangled_name_view = normalize_libcxx_inline_namespaces(
        demangled_name_ptr.get(), demangled_name_ptr.get());
  } else {
    demangled_name_view = string_view(ti.name());
  }
  return detail::write_bytes<char>(out, demangled_name_view);
#  elif FMT_MSC_VERSION && defined(_MSVC_STL_UPDATE)
  return normalize_msvc_abi_name(ti.name(), out);
#  elif FMT_MSC_VERSION && defined(_LIBCPP_VERSION)
  const string_view demangled_name = ti.name();
  std::string name_copy(demangled_name.size(), '\0');
  // normalize_msvc_abi_name removes class, struct, union etc that MSVC has in
  // front of types
  name_copy.erase(normalize_msvc_abi_name(demangled_name, name_copy.begin()),
                  name_copy.end());
  // normalize_libcxx_inline_namespaces removes the inline __1, __2, etc
  // namespaces libc++ uses for ABI versioning On MSVC ABI + libc++
  // environments, we need to eliminate both of them.
  const string_view normalized_name =
      normalize_libcxx_inline_namespaces(name_copy, name_copy.data());
  return detail::write_bytes<char>(out, normalized_name);
#  else
  return detail::write_bytes<char>(out, string_view(ti.name()));
#  endif
}

#endif  // FMT_USE_RTTI