1 files changed, 23 insertions, 0 deletions
diff --git a/include/mbgl/style/filter_comparison_private.hpp b/include/mbgl/style/filter_comparison_private.hpp
new file mode 100644
index 0000000000..6486832424
--- /dev/null
+++ b/include/mbgl/style/filter_comparison_private.hpp
@@ -0,0 +1,23 @@
+#ifndef MBGL_STYLE_FILTER_COMPARISON_PRIVATE
+#define MBGL_STYLE_FILTER_COMPARISON_PRIVATE
+
+#include "filter_comparison.hpp"
+
+namespace mbgl {
+
+template <typename Extractor>
+inline bool FilterComparison::compare(const Extractor &extractor) const {
+    const std::vector<Value> values = extractor.getValues(field);
+
+    // All instances are ANDed together.
+    for (const Instance &instance : instances) {
+        if (!instance.compare(values)) {
+            return false;
+        }
+    }
+    return true;
+}
+
+}
+
+#endif