Index: detail/apply_visitor_binary.hpp
===================================================================
--- detail/apply_visitor_binary.hpp	(revision 43767)
+++ detail/apply_visitor_binary.hpp	(working copy)
@@ -63,6 +63,9 @@
         return visitor_(value1_, value2);
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    apply_visitor_binary_invoke& operator=(const apply_visitor_binary_invoke&);
 };
 
 template <typename Visitor, typename Visitable2>
@@ -100,6 +103,9 @@
         return boost::apply_visitor(invoker, visitable2_);
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    apply_visitor_binary_unwrap& operator=(const apply_visitor_binary_unwrap&);
 };
 
 }} // namespace detail::variant
Index: detail/apply_visitor_delayed.hpp
===================================================================
--- detail/apply_visitor_delayed.hpp	(revision 43767)
+++ detail/apply_visitor_delayed.hpp	(working copy)
@@ -72,6 +72,9 @@
         return apply_visitor(visitor_, visitable1, visitable2);
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    apply_visitor_delayed_t& operator=(const apply_visitor_delayed_t&);
 };
 
 template <typename Visitor>
Index: detail/variant_io.hpp
===================================================================
--- detail/variant_io.hpp	(revision 43767)
+++ detail/variant_io.hpp	(working copy)
@@ -64,6 +64,9 @@
         out_ << operand;
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    printer& operator=(const printer&);
 };
 
 }} // namespace detail::variant
Index: variant.hpp
===================================================================
--- variant.hpp	(revision 43767)
+++ variant.hpp	(working copy)
@@ -290,7 +290,8 @@
     {
         operand.~T();
 
-#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0551))
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0551)) || \
+    BOOST_WORKAROUND(BOOST_MSVC, >= 1300)
         operand; // suppresses warnings
 #endif
 
@@ -529,6 +530,10 @@
 
 #endif // MSVC6 workaround
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    direct_assigner& operator=(const direct_assigner&);
+
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -647,6 +652,9 @@
         BOOST_VARIANT_AUX_RETURN_VOID;
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    backup_assigner& operator=(const backup_assigner&);
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -684,6 +692,9 @@
         ::boost::detail::variant::move_swap( operand, other );
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    swap_with& operator=(const swap_with&);
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -740,6 +751,9 @@
         return Comp()(lhs_content, rhs_content);
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    comparer& operator=(const comparer&);
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -891,6 +905,9 @@
         return internal_visit( operand.get(), 1L );
     }
 
+private:
+    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+    invoke_visitor& operator=(const invoke_visitor&);
 };
 
 }} // namespace detail::variant
@@ -1541,6 +1558,9 @@
             BOOST_VARIANT_AUX_RETURN_VOID;
         }
 
+    private:
+	    //Silence 4512 (assignment operator could not be generated) warning on VC8/9
+	    assigner& operator=(const assigner&);
     };
 
     friend class assigner;