diff --git a/asio/include/asio/impl/connect.hpp b/asio/include/asio/impl/connect.hpp
index 3ebe732b..9392f061 100644
--- a/asio/include/asio/impl/connect.hpp
+++ b/asio/include/asio/impl/connect.hpp
@@ -333,10 +333,18 @@ namespace detail
 
     void operator()(asio::error_code ec, int start = 0)
     {
-      typename EndpointSequence::const_iterator begin = endpoints_.begin();
-      typename EndpointSequence::const_iterator iter = begin;
+      this->process(ec, start,
+          const_cast<const EndpointSequence&>(endpoints_).begin(),
+          const_cast<const EndpointSequence&>(endpoints_).end());
+    }
+
+  //private:
+    template <typename Iterator>
+    void process(asio::error_code ec,
+        int start, Iterator begin, Iterator end)
+    {
+      Iterator iter = begin;
       std::advance(iter, index_);
-      typename EndpointSequence::const_iterator end = endpoints_.end();
 
       switch (start_ = start)
       {
@@ -387,7 +395,6 @@ namespace detail
       }
     }
 
-  //private:
     basic_socket<Protocol, Executor>& socket_;
     EndpointSequence endpoints_;
     std::size_t index_;