aux: capture by reference

alib2aux/src/convert/DotConverter.h

@@ -1304,7 +1304,7 @@ void DotConverter::transitions(const automaton::EpsilonNFTA < SymbolType, StateT
 		i++;
 	}
-	for ( const std::pair < const int, int > epsilonTransition : epsilonTransitions ) {
+	for ( const std::pair < const int, int > & epsilonTransition : epsilonTransitions ) {
 		out << epsilonTransition.first << " -> " << epsilonTransition.second;
 		out << "[label=\"&epsilon;\"]\n";
 	}