+/// Switch the encoding of \p os from runparams.encoding to \p newEnc if needed.
+/// \return (did the encoding change?, number of characters written to \p os)
+std::pair<bool, int> switchEncoding(odocstream & os,
+ BufferParams const & bparams,
+ OutputParams const &, Encoding const & newEnc);
+
+} // namespace lyx
+