Index: detail/apply_visitor_delayed.hpp
===================================================================
--- detail/apply_visitor_delayed.hpp	(revision 41836)
+++ detail/apply_visitor_delayed.hpp	(working copy)
@@ -35,6 +35,11 @@
 //   effect (i.e., returned function object would have dead reference).
 //
 
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+#pragma warning(push)
+#pragma warning(disable:4512) //assignment operator could not be generated
+#endif
+
 template <typename Visitor>
 class apply_visitor_delayed_t
 {
@@ -74,6 +79,10 @@
 
 };
 
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+#pragma warning(pop)
+#endif
+
 template <typename Visitor>
 inline apply_visitor_delayed_t<Visitor> apply_visitor(Visitor& visitor)
 {
Index: variant.hpp
===================================================================
--- variant.hpp	(revision 41836)
+++ variant.hpp	(working copy)
@@ -99,6 +99,10 @@
 #   include "boost/mpl/O1_size.hpp"
 #endif
 
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+#pragma warning(push)
+#pragma warning(disable:4512) //assignment operator could not be generated
+#endif
 
 namespace boost {
 
@@ -1822,6 +1826,10 @@
 
 } // namespace boost
 
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+#pragma warning(pop)
+#endif
+
 // implementation additions
 #include "boost/variant/detail/variant_io.hpp"