256   using ImplToFst<I, F>::GetImpl;
261     GetImpl()->SetStart(s);  in SetStart()
266     GetImpl()->SetFinal(s, w);  in SetFinal()
273     if (GetImpl()->Properties(exprops) != (props & exprops))  in SetProperties()
275     GetImpl()->SetProperties(props, mask);  in SetProperties()
280     return GetImpl()->AddState();  in AddState()
285     GetImpl()->AddArc(s, arc);  in AddArc()
290     GetImpl()->DeleteStates(dstates);  in DeleteStates()
295     GetImpl()->DeleteStates();  in DeleteStates()
300     GetImpl()->DeleteArcs(s, n);  in DeleteArcs()
305     GetImpl()->DeleteArcs(s);  in DeleteArcs()
310     GetImpl()->ReserveStates(s);  in ReserveStates()
315     GetImpl()->ReserveArcs(s, n);  in ReserveArcs()
319     return GetImpl()->InputSymbols();  in InputSymbols()
323     return GetImpl()->OutputSymbols();  in OutputSymbols()
328     return GetImpl()->InputSymbols();  in MutableInputSymbols()
333     return GetImpl()->OutputSymbols();  in MutableOutputSymbols()
338     GetImpl()->SetInputSymbols(isyms);  in SetInputSymbols()
343     GetImpl()->SetOutputSymbols(osyms);  in SetOutputSymbols()
360     if (GetImpl()->RefCount() > 1)  in MutateCheck()
370     GetImpl()->SetProperties(kError, kError);