diff --git a/lib/lattice/Lattice_base.h b/lib/lattice/Lattice_base.h
index 014e443d..dcd55702 100644
--- a/lib/lattice/Lattice_base.h
+++ b/lib/lattice/Lattice_base.h
@@ -257,7 +257,11 @@ public:
     }  	
   }
   
-  
+  Lattice(Lattice&& r){ // move constructor
+    _grid = r._grid;
+    checkerboard = r.checkerboard;
+    _odata=std::move(r._odata);
+  }
   
   virtual ~Lattice(void) = default;
     
@@ -286,6 +290,24 @@ public:
     }
     return *this;
   }
+
+  strong_inline Lattice<vobj> & operator = (const Lattice<vobj> & r){
+    _grid        = r._grid;
+    checkerboard = r.checkerboard;
+    _odata.resize(_grid->oSites());// essential
+    
+    parallel_for(int ss=0;ss<_grid->oSites();ss++){
+      _odata[ss]=r._odata[ss];
+    }  	
+    return *this;
+  }
+  strong_inline Lattice<vobj> & operator = (Lattice<vobj> && r)
+  {
+    _grid        = r._grid;
+    checkerboard = r.checkerboard;
+    _odata       =std::move(r._odata);
+    return *this;
+  }
   
   // *=,+=,-= operators inherit behvour from correspond */+/- operation
   template<class T> strong_inline Lattice<vobj> &operator *=(const T &r) {