ENH: added xfer function to Field (stopped falling through to List)

src/OpenFOAM/fields/Fields/Field/Field.C

@@ -578,6 +578,13 @@ tmp<Field<Type> > Field<Type>::T() const
 }
 
 
+template<class Type>
+Xfer<Field<Type> > Field<Type>::xfer()
+{
+    return xferMove(*this);
+}
+
+
 template<class Type>
 void Field<Type>::writeEntry(const word& keyword, Ostream& os) const
 {

src/OpenFOAM/fields/Fields/Field/Field.H

@@ -302,6 +302,9 @@ public:
         //- Return the field transpose (only defined for second rank tensors)
         tmp<Field<Type> > T() const;
 
+        //- Transfer contents to the Xfer container
+        Xfer<Field<Type> > xfer();
+
         //- Write the field as a dictionary entry
         void writeEntry(const word& keyword, Ostream& os) const;