Update mussa to build on ubuntu 10.04 with qt 4.6.2 +boost 1.40.0.1

[mussa.git] / alg / conserved_path.hpp

diff --git a/alg/conserved_path.hpp b/alg/conserved_path.hpp
index 5f7e0033ce208fc6addfcc7e53872cd05bc6e458..7ff26613ab23ae2ea5ce16998348a022dfaaeccc 100644 (file)
--- a/alg/conserved_path.hpp
+++ b/alg/conserved_path.hpp
@@ -29,6 +29,7 @@ struct ConservedPath
 
   friend bool operator==(const ConservedPath& a, const ConservedPath &b);
   friend bool operator!=(const ConservedPath& a, const ConservedPath &b);
+  friend bool operator<(const ConservedPath& a, const ConservedPath &b);
   friend std::ostream& operator<<(std::ostream&, const ConservedPath&);
 
   //! return true if all elements of the path are "next to" our current path.