explicitly state that we override the functions from the expression visitor

src/storm/storage/jani/ArrayEliminator.cpp

@@ -27,6 +27,8 @@ namespace storm {
             
             class MaxArraySizeExpressionVisitor : public storm::expressions::ExpressionVisitor, public storm::expressions::JaniExpressionVisitor {
             public:
+                using storm::expressions::ExpressionVisitor::visit;
+
                 MaxArraySizeExpressionVisitor() = default;
                 virtual ~MaxArraySizeExpressionVisitor() = default;
     
@@ -128,6 +130,7 @@ namespace storm {
             
             class ArrayExpressionEliminationVisitor : public storm::expressions::ExpressionVisitor, public storm::expressions::JaniExpressionVisitor {
             public:
+                using storm::expressions::ExpressionVisitor::visit;
 
                 typedef std::shared_ptr<storm::expressions::BaseExpression const> BaseExprPtr;
                 class ResultType {

src/storm/storage/jani/FunctionEliminator.cpp

@@ -26,6 +26,8 @@ namespace storm {
             
             class FunctionEliminationExpressionVisitor : public storm::expressions::ExpressionVisitor, public storm::expressions::JaniExpressionVisitor {
             public:
+                using storm::expressions::ExpressionVisitor::visit;
+
 
                 typedef std::shared_ptr<storm::expressions::BaseExpression const> BaseExprPtr;
 

src/storm/storage/jani/JSONExporter.h

@@ -17,6 +17,7 @@ namespace storm {
         class ExpressionToJson : public storm::expressions::ExpressionVisitor, public storm::expressions::JaniExpressionVisitor {
             
         public:
+            using storm::expressions::ExpressionVisitor::visit;
             static ExportJsonType translate(storm::expressions::Expression const& expr, std::vector<storm::jani::Constant> const& constants, VariableSet const& globalVariables, VariableSet const& localVariables, std::unordered_set<std::string> const& auxiliaryVariables);
             
             virtual boost::any visit(storm::expressions::IfThenElseExpression const& expression, boost::any const& data);

src/storm/storage/jani/traverser/ArrayExpressionFinder.cpp

@@ -11,6 +11,8 @@ namespace storm {
         namespace detail {
             class ArrayExpressionFinderExpressionVisitor : public storm::expressions::ExpressionVisitor, public storm::expressions::JaniExpressionVisitor {
             public:
+                using storm::expressions::ExpressionVisitor::visit;
+
                 virtual boost::any visit(storm::expressions::IfThenElseExpression const& expression, boost::any const& data) override {
                     return
                         boost::any_cast<bool>(expression.getCondition()->accept(*this, data)) ||

src/storm/storage/jani/traverser/FunctionCallExpressionFinder.cpp

@@ -11,6 +11,7 @@ namespace storm {
         namespace detail {
             class FunctionCallExpressionFinderExpressionVisitor : public storm::expressions::ExpressionVisitor, public storm::expressions::JaniExpressionVisitor {
             public:
+                using storm::expressions::ExpressionVisitor::visit;
                 virtual boost::any visit(storm::expressions::IfThenElseExpression const& expression, boost::any const& data) override {
                     expression.getCondition()->accept(*this, data);
                     expression.getThenExpression()->accept(*this, data);