Removed unnecessary std::moves

Former-commit-id: c6436f7873

src/parser/DeterministicModelParser.cpp

@@ -23,7 +23,7 @@ namespace storm {
             uint_fast64_t stateCount = transitions.getColumnCount();
 
             // Parse the state labeling.
-            storm::models::sparse::StateLabeling labeling(std::move(storm::parser::AtomicPropositionLabelingParser::parseAtomicPropositionLabeling(stateCount, labelingFilename)));
+            storm::models::sparse::StateLabeling labeling(storm::parser::AtomicPropositionLabelingParser::parseAtomicPropositionLabeling(stateCount, labelingFilename));
 
             // Construct the result.
             DeterministicModelParser<ValueType, RewardValueType>::Result result(std::move(transitions), std::move(labeling));

src/parser/NondeterministicModelParser.cpp

@@ -24,7 +24,7 @@ namespace storm {
             uint_fast64_t stateCount = transitions.getColumnCount();
 
             // Parse the state labeling.
-            storm::models::sparse::StateLabeling labeling(std::move(storm::parser::AtomicPropositionLabelingParser::parseAtomicPropositionLabeling(stateCount, labelingFilename)));
+            storm::models::sparse::StateLabeling labeling(storm::parser::AtomicPropositionLabelingParser::parseAtomicPropositionLabeling(stateCount, labelingFilename));
 
             // Only parse state rewards if a file is given.
             boost::optional<std::vector<RewardValueType>> stateRewards;

src/storage/expressions/ToExprtkStringVisitor.cpp

@@ -10,7 +10,7 @@ namespace storm {
             stream.str("");
             stream.clear();
             expression->accept(*this);
-            return std::move(stream.str());
+            return stream.str();
         }
         
         boost::any ToExprtkStringVisitor::visit(IfThenElseExpression const& expression) {