1 files changed, 6 insertions, 7 deletions
diff --git a/include/mbgl/style/function/composite_function.hpp b/include/mbgl/style/function/composite_function.hpp
index f391b101ae..614c345c25 100644
--- a/include/mbgl/style/function/composite_function.hpp
+++ b/include/mbgl/style/function/composite_function.hpp
@@ -51,16 +51,16 @@ public:
             CompositeCategoricalStops<T>>>;
 
     CompositeFunction(std::unique_ptr<expression::Expression> expression_)
-    :   expression(std::move(expression_)),
+    :   isExpression(true),
+        expression(std::move(expression_)),
         zoomCurve(expression::findZoomCurveChecked(expression.get()))
     {
         assert(!expression::isZoomConstant(*expression));
         assert(!expression::isFeatureConstant(*expression));
     }
 
-    CompositeFunction(std::string property_, Stops stops_, optional<T> defaultValue_ = {})
-    :   property(std::move(property_)),
-        stops(std::move(stops_)),
+    CompositeFunction(const std::string& property, const Stops& stops, optional<T> defaultValue_ = {})
+    :   isExpression(false),
         defaultValue(std::move(defaultValue_)),
         expression(stops.match([&] (const auto& s) {
             return expression::Convert::toExpression(property, s);
@@ -113,12 +113,11 @@ public:
 
     const expression::Expression& getExpression() const { return *expression; }
 
-    std::string property;
-    Stops stops;
-    optional<T> defaultValue;
     bool useIntegerZoom = false;
+    bool isExpression;
     
 private:
+    optional<T> defaultValue;
     std::shared_ptr<expression::Expression> expression;
     const variant<const expression::InterpolateBase*, const expression::Step*> zoomCurve;
 };