add virtual destructor to BaseFilterFunctor (#460)

yoshoku · web-flow · commit 1925428dcd40 · 2023-05-13T13:59:32.000+04:00
diff --git a/hnswlib/hnswlib.h b/hnswlib/hnswlib.h
@@ -119,6 +119,7 @@ typedef size_t labeltype;
 class BaseFilterFunctor {
  public:
     virtual bool operator()(hnswlib::labeltype id) { return true; }
+    virtual ~BaseFilterFunctor() {};
 };
 
 template <typename T>
