Function wstring_printf

src/common/Utility.h:47–52

template <typename... ArgTypes>
std::wstring wstring_printf(const wchar_t *format, ArgTypes &&... args) {
  size_t size = _snwprintf(nullptr, 0, format, args...);
  std::vector<wchar_t> buf(size + 1);
  _snwprintf(buf.data(), size + 1, format, args...);
  return buf.data();
}

class MoveOnlyFlag {
  using Self = MoveOnlyFlag;