1 files changed, 11 insertions, 0 deletions
diff --git a/extractor/features/is_source_singleton.cc b/extractor/features/is_source_singleton.cc
new file mode 100644
index 00000000..754df3bf
--- /dev/null
+++ b/extractor/features/is_source_singleton.cc
@@ -0,0 +1,11 @@
+#include "is_source_singleton.h"
+
+#include <cmath>
+
+double IsSourceSingleton::Score(const FeatureContext& context) const {
+  return context.sample_source_count == 1;
+}
+
+string IsSourceSingleton::GetName() const {
+  return "IsSingletonF";
+}