fix unintended pass by value

alib2data/src/automaton/TA/DFTA.h

@@ -284,7 +284,7 @@ public:
 	 *
 	 * \returns true if the transition was indeed removed
 	 */
-	bool removeTransition ( const common::ranked_symbol < SymbolType, RankType > symbol, const ext::vector < StateType > & states, const StateType & next );
+	bool removeTransition ( const common::ranked_symbol < SymbolType, RankType > & symbol, const ext::vector < StateType > & states, const StateType & next );
 	/**
 	 * Get the transition function of the automaton in its natural form.
@@ -430,7 +430,7 @@ bool DFTA < SymbolType, RankType, StateType >::addTransition ( common::ranked_sy
 }
 template<class SymbolType, class RankType, class StateType >
-bool DFTA < SymbolType, RankType, StateType >::removeTransition(const common::ranked_symbol < SymbolType, RankType > symbol, const ext::vector<StateType> & states, const StateType & next) {
+bool DFTA < SymbolType, RankType, StateType >::removeTransition(const common::ranked_symbol < SymbolType, RankType > & symbol, const ext::vector<StateType> & states, const StateType & next) {
 	ext::pair<common::ranked_symbol < SymbolType, RankType >, ext::vector<StateType> > key = ext::make_pair(symbol, states);
 	if ( transitions.find ( key ) == transitions.end ( ) )

alib2data/src/automaton/TA/ExtendedNFTA.h

@@ -309,7 +309,7 @@ public:
 	 *
 	 * \returns true if the transition was indeed removed
 	 */
-	bool removeTransition ( const rte::FormalRTEStructure < ext::variant < SymbolType, StateType >, RankType > rte, const ext::vector < StateType > & prevStates, const StateType& next );
+	bool removeTransition ( const rte::FormalRTEStructure < ext::variant < SymbolType, StateType >, RankType > & rte, const ext::vector < StateType > & prevStates, const StateType& next );
 	/**
 	 * Get the transition function of the automaton in its natural form.
@@ -475,7 +475,7 @@ void ExtendedNFTA < SymbolType, RankType, StateType >::addTransitions ( rte::For
 }
 template < class SymbolType, class RankType, class StateType >
-bool ExtendedNFTA < SymbolType, RankType, StateType >::removeTransition ( const rte::FormalRTEStructure < ext::variant < SymbolType, StateType >, RankType > rte, const ext::vector < StateType > & prevStates, const StateType& next ) {
+bool ExtendedNFTA < SymbolType, RankType, StateType >::removeTransition ( const rte::FormalRTEStructure < ext::variant < SymbolType, StateType >, RankType > & rte, const ext::vector < StateType > & prevStates, const StateType& next ) {
 	ext::pair < rte::FormalRTEStructure < ext::variant < SymbolType, StateType >, RankType >, ext::vector < StateType > > key = ext::make_pair ( rte, prevStates );
 	return transitions [ key ].erase ( next );
 }

alib2data/src/automaton/TA/NFTA.h

@@ -289,7 +289,7 @@ public:
 	 *
 	 * \returns true if the transition was indeed removed
 	 */
-	bool removeTransition ( const common::ranked_symbol < SymbolType, RankType > symbol, const ext::vector < StateType > & states, const StateType & next );
+	bool removeTransition ( const common::ranked_symbol < SymbolType, RankType > & symbol, const ext::vector < StateType > & states, const StateType & next );
 	/**
 	 * Get the transition function of the automaton in its natural form.
@@ -448,7 +448,7 @@ bool NFTA < SymbolType, RankType, StateType >::addTransition ( common::ranked_sy
 }
 template < class SymbolType, class RankType, class StateType >
-bool NFTA < SymbolType, RankType, StateType >::removeTransition(const common::ranked_symbol < SymbolType, RankType > symbol, const ext::vector<StateType> & states, const StateType & next) {
+bool NFTA < SymbolType, RankType, StateType >::removeTransition(const common::ranked_symbol < SymbolType, RankType > & symbol, const ext::vector<StateType> & states, const StateType & next) {
 	auto upper_bound = transitions.upper_bound ( ext::tie ( symbol, states ) );
 	auto lower_bound = transitions.lower_bound ( ext::tie ( symbol, states ) );
 	auto iter = std::find_if ( lower_bound, upper_bound, [ & ] ( const auto & transition ) { return transition.second == next; } );