# See www.openfst.org for extensive documentation on this weighted
  # finite-state transducer library.
  
  
  from libcpp.memory cimport shared_ptr
  
  
  # This is mysteriously missing from libcpp.memory.
  
  cdef extern from "<memory>" namespace "std" nogil:
  
    shared_ptr[T] static_pointer_cast[T, U](const shared_ptr[U] &)