// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  
  #ifndef FST_SCRIPT_ENCODE_H_
  #define FST_SCRIPT_ENCODE_H_
  
  #include <memory>
  #include <string>
  #include <tuple>
  #include <utility>
  
  #include <fst/encode.h>
  #include <fst/script/encodemapper-class.h>
  #include <fst/script/fst-class.h>
  
  namespace fst {
  namespace script {
  
  using EncodeArgs1 = std::tuple<MutableFstClass *, uint32, bool, const string &>;
  
  template <class Arc>
  void Encode(EncodeArgs1 *args) {
    MutableFst<Arc> *fst = std::get<0>(*args)->GetMutableFst<Arc>();
    const string &coder_fname = std::get<3>(*args);
    // If true, reuse encode from disk. If false, make a new encoder and just use
    // the filename argument as the destination state.
    std::unique_ptr<EncodeMapper<Arc>> encoder(
        std::get<2>(*args) ? EncodeMapper<Arc>::Read(coder_fname, ENCODE)
                           : new EncodeMapper<Arc>(std::get<1>(*args), ENCODE));
    Encode(fst, encoder.get());
    if (!std::get<2>(*args)) encoder->Write(coder_fname);
  }
  
  using EncodeArgs2 = std::pair<MutableFstClass *, EncodeMapperClass *>;
  
  template <class Arc>
  void Encode(EncodeArgs2 *args) {
    MutableFst<Arc> *fst = std::get<0>(*args)->GetMutableFst<Arc>();
    EncodeMapper<Arc> *encoder = std::get<1>(*args)->GetEncodeMapper<Arc>();
    Encode(fst, encoder);
  }
  
  void Encode(MutableFstClass *fst, uint32 flags, bool reuse_encoder,
              const string &coder_fname);
  
  void Encode(MutableFstClass *fst, EncodeMapperClass *encoder);
  
  }  // namespace script
  }  // namespace fst
  
  #endif  // FST_SCRIPT_ENCODE_H_