Index: swap.hpp
===================================================================
--- swap.hpp	(revision 47858)
+++ swap.hpp	(working copy)
@@ -38,8 +38,8 @@
 {
   namespace swap_adl_barrier
   {
-    template<class T>
-    void swap(T& left, T& right)
+    template<class T1, class T2>
+    void swap(T1& left, T2& right)
     {
       ::boost_swap_impl::swap_impl(left, right);
     }