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diff --git a/src/bmsparsevec_compr.h b/src/bmsparsevec_compr.h
index ed774c6d..5dbaf09f 100644
--- a/src/bmsparsevec_compr.h
+++ b/src/bmsparsevec_compr.h
@@ -280,7 +280,10 @@ public:
/** add a series of consequitve NULLs (no-value) to the container */
void add_null(size_type count) BMNOEXCEPT;
-
+
+ /** return true if insertion buffer is empty */
+ bool empty() const { return sv_bi_.empty(); }
+
/** flush the accumulated buffer */
void flush();
protected:
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