[core] Force getGeometries() return const ref

1 files changed, 3 insertions, 1 deletions

diff --git a/src/mbgl/style/expression/expression.cpp b/src/mbgl/style/expression/expression.cpp
index 1e5b1581d2..4800f6aa7f 100644
--- a/src/mbgl/style/expression/expression.cpp
+++ b/src/mbgl/style/expression/expression.cpp
@@ -17,7 +17,7 @@ public:
     }
     PropertyMap getProperties() const override { return feature.properties; }
     FeatureIdentifier getID() const override { return feature.id; }
-    GeometryCollection getGeometries() const override { return {}; }
+    const GeometryCollection& getGeometries() const override { return geometry; }
     optional<mbgl::Value> getValue(const std::string& key) const override {
         auto it = feature.properties.find(key);
         if (it != feature.properties.end()) {
@@ -25,6 +25,8 @@ public:
         }
         return optional<mbgl::Value>();
     }
+
+    GeometryCollection geometry;
 };