1 files changed, 13 insertions, 2 deletions
diff --git a/src/mbgl/style/possibly_evaluated_property_value.hpp b/src/mbgl/style/possibly_evaluated_property_value.hpp
index 8c3f1780a6..9cb5f6e81b 100644
--- a/src/mbgl/style/possibly_evaluated_property_value.hpp
+++ b/src/mbgl/style/possibly_evaluated_property_value.hpp
@@ -7,8 +7,6 @@
 
 namespace mbgl {
 
-class GeometryTileFeature;
-
 namespace style {
 
 template <class T>
@@ -43,6 +41,19 @@ public:
     auto match(Ts&&... ts) const {
         return value.match(std::forward<Ts>(ts)...);
     }
+
+    template <class Feature>
+    T evaluate(const Feature& feature, float zoom, T defaultValue) const {
+        return this->match(
+                [&] (const T& constant) { return constant; },
+                [&] (const SourceFunction<T>& function) {
+                    return function.evaluate(feature, defaultValue);
+                },
+                [&] (const CompositeFunction<T>& function) {
+                    return function.evaluate(zoom, feature, defaultValue);
+                }
+        );
+    }
 };
 
 } // namespace style