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--- a/src/utils/refcntr.h
+++ b/src/utils/refcntr.h
@@ -9,7 +9,7 @@
     RefCntr() 
 	: rep(0), pcount(0) 
     {}
-    RefCntr(X *pp) 
+    explicit RefCntr(X *pp) 
 	: rep(pp), pcount(new int(1)) 
     {}
     RefCntr(const RefCntr &r)