2 files changed, 3 insertions, 1 deletions
diff --git a/decoder/oracle_bleu.h b/decoder/oracle_bleu.h
index 550f438f..6708b02e 100755
--- a/decoder/oracle_bleu.h
+++ b/decoder/oracle_bleu.h
@@ -38,7 +38,7 @@ struct Translation {
     out<<pre<<"features: "<<features<<std::endl;
   }
   bool is_null() {
-    return features.size()==0 /* && sentence.size()==0 */;
+    return features.empty() /* && sentence.empty() */;
   }
 
 };
diff --git a/decoder/sparse_vector.h b/decoder/sparse_vector.h
index c6c57150..455a162b 100644
--- a/decoder/sparse_vector.h
+++ b/decoder/sparse_vector.h
@@ -255,6 +255,8 @@ public:
         return values_.size() < other.values_.size();
     }
 
+  int size() const { return values_.size(); }
+
     int num_active() const { return values_.size(); }
     bool empty() const { return values_.empty(); }