// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  
  #ifndef FST_SCRIPT_DECODE_H_
  #define FST_SCRIPT_DECODE_H_
  
  #include <memory>
  #include <string>
  #include <utility>
  
  #include <fst/encode.h>
  #include <fst/script/encodemapper-class.h>
  #include <fst/script/fst-class.h>
  
  namespace fst {
  namespace script {
  
  using DecodeArgs1 = std::pair<MutableFstClass *, const string &>;
  
  template <class Arc>
  void Decode(DecodeArgs1 *args) {
    MutableFst<Arc> *fst = std::get<0>(*args)->GetMutableFst<Arc>();
    std::unique_ptr<EncodeMapper<Arc>> decoder(
        EncodeMapper<Arc>::Read(std::get<1>(*args), DECODE));
    if (!decoder) {
      fst->SetProperties(kError, kError);
      return;
    }
    Decode(fst, *decoder);
  }
  
  using DecodeArgs2 = std::pair<MutableFstClass *, const EncodeMapperClass &>;
  
  template <class Arc>
  void Decode(DecodeArgs2 *args) {
    MutableFst<Arc> *fst = std::get<0>(*args)->GetMutableFst<Arc>();
    const EncodeMapper<Arc> &encoder =
        *(std::get<1>(*args).GetEncodeMapper<Arc>());
    Decode(fst, encoder);
  }
  
  void Decode(MutableFstClass *fst, const string &coder_fname);
  
  void Decode(MutableFstClass *fst, const EncodeMapperClass &encoder);
  
  }  // namespace script
  }  // namespace fst
  
  #endif  // FST_SCRIPT_DECODE_H_