Compile fix

apoorv sharma · apoorv sharma · commit 524873b9aa77 · 2020-05-22T15:08:02.000-07:00
diff --git a/hnswlib/hnswalg.h b/hnswlib/hnswalg.h
@@ -2,6 +2,7 @@
 
 #include "visited_list_pool.h"
 #include "hnswlib.h"
+#include <atomic>
 #include <random>
 #include <stdlib.h>
 #include <unordered_set>
