// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  
  #include <fst/script/fst-class.h>
  #include <fst/script/concat.h>
  #include <fst/script/script-impl.h>
  
  namespace fst {
  namespace script {
  
  // 1
  void Concat(MutableFstClass *ofst, const FstClass &ifst) {
    if (!internal::ArcTypesMatch(*ofst, ifst, "Concat")) {
      ofst->SetProperties(kError, kError);
      return;
    }
    ConcatArgs1 args(ofst, ifst);
    Apply<Operation<ConcatArgs1>>("Concat", ofst->ArcType(), &args);
  }
  
  // 2
  void Concat(const FstClass &ifst, MutableFstClass *ofst) {
    if (!internal::ArcTypesMatch(ifst, *ofst, "Concat")) {
      ofst->SetProperties(kError, kError);
      return;
    }
    ConcatArgs2 args(ifst, ofst);
    Apply<Operation<ConcatArgs2>>("Concat", ofst->ArcType(), &args);
  }
  
  REGISTER_FST_OPERATION(Concat, StdArc, ConcatArgs1);
  REGISTER_FST_OPERATION(Concat, LogArc, ConcatArgs1);
  REGISTER_FST_OPERATION(Concat, Log64Arc, ConcatArgs1);
  
  REGISTER_FST_OPERATION(Concat, StdArc, ConcatArgs2);
  REGISTER_FST_OPERATION(Concat, LogArc, ConcatArgs2);
  REGISTER_FST_OPERATION(Concat, Log64Arc, ConcatArgs2);
  
  }  // namespace script
  }  // namespace fst