Update for Net-TS Asio (API Change):

fix #769

The following classes are removed:

* handler_type
* async_result
* async_completion
* is_dynamic_buffer
* is_const_buffer_sequence
* is_mutable_buffer_sequence
* handler_alloc

Actions Required:

* Use BOOST_ASIO_HANDLER_TYPE instead of handler_type
* Use BOOST_ASIO_INITFN_RESULT_TYPE instead of async_result
* Use boost::asio::async_completion
* Use boost::asio::is_dynamic_buffer
* Use boost::asio::is_const_buffer_sequence
* Use boost::asio::is_mutable_buffer_sequence
* boost::asio::associated_allocator_t replaces handler_alloc

example/http/client/sync/http_client_sync.cpp

@@ -45,18 +45,18 @@ int main(int argc, char** argv)
         auto const port = argv[2];
         auto const target = argv[3];
 
-        // The io_service is required for all I/O
-        boost::asio::io_service ios;
+        // The io_context is required for all I/O
+        boost::asio::io_context ioc;
 
         // These objects perform our I/O
-        tcp::resolver resolver{ios};
-        tcp::socket socket{ios};
+        tcp::resolver resolver{ioc};
+        tcp::socket socket{ioc};
 
         // Look up the domain name
-        auto const lookup = resolver.resolve({host, port});
+        auto const results = resolver.resolve(host, port);
 
         // Make the connection on the IP address we get from a lookup
-        boost::asio::connect(socket, lookup);
+        boost::asio::connect(socket, results.begin(), results.end());
 
         // Set up an HTTP GET request message
         http::request<http::string_body> req{http::verb::get, target, 11};