Add move support to dev_poll_reactor.

asio/include/asio/detail/dev_poll_reactor.hpp

diff --git a/asio/include/asio/detail/dev_poll_reactor.hpp b/asio/include/asio/detail/dev_poll_reactor.hpp
index ca2ba74..d232de2 100644
--- a/asio/include/asio/detail/dev_poll_reactor.hpp
+++ b/asio/include/asio/detail/dev_poll_reactor.hpp
@@ -80,6 +80,11 @@
       int op_type, socket_type descriptor,
       per_descriptor_data& descriptor_data, reactor_op* op);
 
+  // Move descriptor registration from one descriptor_data object to another.
+  ASIO_DECL void move_descriptor(socket_type descriptor,
+      per_descriptor_data& target_descriptor_data,
+      per_descriptor_data& source_descriptor_data);
+
   // Post a reactor operation for immediate completion.
   void post_immediate_completion(reactor_op* op)
   {

asio/include/asio/detail/impl/dev_poll_reactor.ipp

diff --git a/asio/include/asio/detail/impl/dev_poll_reactor.ipp b/asio/include/asio/detail/impl/dev_poll_reactor.ipp
index 7606142..6041241 100644
--- a/asio/include/asio/detail/impl/dev_poll_reactor.ipp
+++ b/asio/include/asio/detail/impl/dev_poll_reactor.ipp
@@ -153,6 +153,12 @@
   return 0;
 }
 
+void dev_poll_reactor::move_descriptor(socket_type,
+    dev_poll_reactor::per_descriptor_data&,
+    dev_poll_reactor::per_descriptor_data&)
+{
+}
+
 void dev_poll_reactor::start_op(int op_type, socket_type descriptor,
     dev_poll_reactor::per_descriptor_data&,
     reactor_op* op, bool allow_speculative)