[core] Default GeometryTileFeature::getGeometries() implementation

src/mbgl/style/expression/expression.cpp

@@ -17,7 +17,6 @@ public:
     }
     PropertyMap getProperties() const override { return feature.properties; }
     FeatureIdentifier getID() const override { return feature.id; }
-    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()) {
@@ -25,8 +24,6 @@ public:
         }
         return optional<mbgl::Value>();
     }
-
-    GeometryCollection geometry;
 };
 
 

src/mbgl/tile/geometry_tile_data.cpp

@@ -180,4 +180,9 @@ Feature convertFeature(const GeometryTileFeature& geometryTileFeature, const Can
     return feature;
 }
 
+const GeometryCollection& GeometryTileFeature::getGeometries() const {
+    static const GeometryCollection dummy;
+    return dummy;
+}
+
 } // namespace mbgl

src/mbgl/tile/geometry_tile_data.hpp

@@ -44,7 +44,7 @@ public:
     virtual optional<Value> getValue(const std::string& key) const = 0;
     virtual PropertyMap getProperties() const { return PropertyMap(); }
     virtual FeatureIdentifier getID() const { return NullValue {}; }
-    virtual const GeometryCollection& getGeometries() const = 0;
+    virtual const GeometryCollection& getGeometries() const;
 };
 
 class GeometryTileLayer {