  HfstInputStream | A stream for reading HFST binary transducers |
| HfstOutputStream | A stream for writing binary transducers |
| HfstTokenizer | A tokenizer for creating transducers from UTF-8 strings |
| HfstTransducer | A synchronous finite-state transducer |
| HfstFastTransitionData | One implementation of template class C in HfstTransition |
| HfstTransition< C > | A transition that consists of a target state and transition data represented by class C |
| HfstTransitionGraph< C > | A simple transition graph format that consists of states and transitions between those states |
| HfstTropicalTransducerTransitionData | One implementation of template class C in HfstTransition |
| MyTransducerLibraryInputStream | A skeleton class for reading a new type of binary transducers from a stream |
| MyTransducerLibraryOutputStream | A skeleton class for writing a new type of binary transducers to a stream |
| MyTransducerLibraryTransducer | A skeleton library class that contains operations for a new transducer type that is added under the HFST interface |
 Rule | A rule that contains mapping and context and replace type (if any). If rule is A -> B || L _ R , than mapping is cross product of transducers A and B, context is pair of transducers L and R, and replType is enum REPL_UP |
  MarkUpRule | Mark up rule has two markers on the right side of the mapping. Mapping is only left side of the mapping |
| Speller | A spellchecker, constructed from two optimized-lookup transducer instances. An alphabet translator is built at construction time |
| Transducer | A compiled transducer format, suitable for fast lookup operations |
 HfstException | Base class for HfstExceptions. Holds its own name and the file and line number where it was thrown |
 ContextTransducersAreNotAutomataException | Context transducers are not automata |
| EmptySetOfContextsException | The set of transducer pairs is empty |
| EndOfStreamException | The stream is at end |
| FunctionNotImplementedException | Function has not been implemented (yet) |
| HfstFatalException | An error happened probably due to a bug in the HFST code |
| HfstTransducerTypeMismatchException | Two or more HfstTransducers are not of the same type |
| ImplementationTypeNotAvailableException | The library required by the implementation type requested is not linked to HFST |
| IncorrectUtf8CodingException | String is not valid utf-8 |
| MissingOpenFstInputSymbolTableException | An OpenFst transducer does not have an input symbol table |
| NotTransducerStreamException | The stream does not contain transducers |
| NotValidAttFormatException | The stream is not in valid AT&T format |
| StateIndexOutOfBoundsException | The StateId argument is not valid |
| StateIsNotFinalException | State is not final (and cannot have a final weight) |
| StreamCannotBeWrittenException | Stream cannot be written |
| StreamIsClosedException | Stream is closed |
| StreamNotReadableException | Stream cannot be read |
| TransducerHasWrongTypeException | Transducer has wrong type |
| TransducerHeaderException | Transducer has a malformed HFST header |
| TransducerIsCyclicException | Transducer is cyclic |
| TransducersAreNotAutomataException | Transducers are not automata |
| TransducerTypeMismatchException | Two or more transducers do not have the same type |
1.8.6
