1 files changed, 10 insertions, 0 deletions
diff --git a/src/mbgl/style/class_properties.hpp b/src/mbgl/style/class_properties.hpp
index d115f14d50..84b91d769e 100644
--- a/src/mbgl/style/class_properties.hpp
+++ b/src/mbgl/style/class_properties.hpp
@@ -3,6 +3,7 @@
 
 #include <mbgl/style/property_key.hpp>
 #include <mbgl/style/property_value.hpp>
+#include <mbgl/style/property_evaluator.hpp>
 #include <mbgl/style/property_transition.hpp>
 
 #include <map>
@@ -29,6 +30,15 @@ public:
         return properties.end();
     }
 
+    template <typename T>
+    void calculate(PropertyKey key, T& target, const float z) const {
+        auto it = properties.find(key);
+        if (it != properties.end()) {
+            const PropertyEvaluator<T> evaluator(z);
+            target = mapbox::util::apply_visitor(evaluator, it->second);
+        }
+    }
+
 public:
     std::map<PropertyKey, PropertyValue> properties;
     std::map<PropertyKey, PropertyTransition> transitions;