Fix concurrent edit, tests

1 files changed, 2 insertions, 0 deletions

diff --git a/diff.h b/diff.h
index 09d0936..5c2c335 100644
--- a/diff.h
+++ b/diff.h
@@ -19,6 +19,8 @@ public:
 
  std::string apply(const std::string& old_version) const;
 
+ bool empty() const;
+
  boost::property_tree::ptree get_structure() const;
  std::string get_xml() const;