// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  
  #ifndef FST_SCRIPT_DISAMBIGUATE_H_
  #define FST_SCRIPT_DISAMBIGUATE_H_
  
  #include <tuple>
  #include <utility>
  
  #include <fst/disambiguate.h>
  #include <fst/script/fst-class.h>
  #include <fst/script/weight-class.h>
  
  namespace fst {
  namespace script {
  
  struct DisambiguateOptions {
    const float delta;
    const WeightClass &weight_threshold;
    const int64 state_threshold;
    const int64 subsequential_label;
  
    DisambiguateOptions(float delta, const WeightClass &weight_threshold,
                        int64 state_threshold = kNoStateId,
                        int64 subsequential_label = 0)
        : delta(delta),
          weight_threshold(weight_threshold),
          state_threshold(state_threshold),
          subsequential_label(subsequential_label) {}
  };
  
  using DisambiguateArgs = std::tuple<const FstClass &, MutableFstClass *,
                                       const DisambiguateOptions &>;
  
  template <class Arc>
  void Disambiguate(DisambiguateArgs *args) {
    using Weight = typename Arc::Weight;
    const Fst<Arc> &ifst = *(std::get<0>(*args).GetFst<Arc>());
    MutableFst<Arc> *ofst = std::get<1>(*args)->GetMutableFst<Arc>();
    const auto &opts = std::get<2>(*args);
    const auto weight_threshold = *(opts.weight_threshold.GetWeight<Weight>());
    const fst::DisambiguateOptions<Arc> disargs(opts.delta, weight_threshold,
                                                    opts.state_threshold,
                                                    opts.subsequential_label);
    Disambiguate(ifst, ofst, disargs);
  }
  
  void Disambiguate(const FstClass &ifst, MutableFstClass *ofst,
                    const DisambiguateOptions &opts);
  
  }  // namespace script
  }  // namespace fst
  
  #endif  // FST_SCRIPT_DISAMBIGUATE_H_