1 files changed, 4 insertions, 0 deletions
diff --git a/include/mbgl/style/function/composite_function.hpp b/include/mbgl/style/function/composite_function.hpp
index b44bf8e6fe..24578f599c 100644
--- a/include/mbgl/style/function/composite_function.hpp
+++ b/include/mbgl/style/function/composite_function.hpp
@@ -102,6 +102,10 @@ public:
         );
     }
 
+    std::vector<optional<T>> possibleOutputs() const {
+        return expression::fromExpressionValues<T>(expression->possibleOutputs());
+    }
+
     friend bool operator==(const CompositeFunction& lhs,
                            const CompositeFunction& rhs) {
         return *lhs.expression == *rhs.expression;