Merge [51909], [51912], [52937], [53672] to release.

[SVN r55479]

include/boost/smart_ptr/intrusive_ptr.hpp

@@ -109,6 +109,23 @@ public:
         return *this;
     }
 
+#endif
+
+// Move support
+
+#if defined( BOOST_HAS_RVALUE_REFS )
+
+    intrusive_ptr(intrusive_ptr && rhs): px( rhs.px )
+    {
+        rhs.px = 0;
+    }
+
+    intrusive_ptr & operator=(intrusive_ptr && rhs)
+    {
+        this_type(std::move(rhs)).swap(*this);
+        return *this;
+    }
+
 #endif
 
     intrusive_ptr & operator=(intrusive_ptr const & rhs)