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/websocket/client/coro/websocket_client_coro.cpp

@@ -41,22 +41,22 @@ do_session(
     std::string const& host,
     std::string const& port,
     std::string const& text,
-    boost::asio::io_service& ios,
+    boost::asio::io_context& ioc,
     boost::asio::yield_context yield)
 {
     boost::system::error_code ec;
 
     // These objects perform our I/O
-    tcp::resolver resolver{ios};
-    websocket::stream<tcp::socket> ws{ios};
+    tcp::resolver resolver{ioc};
+    websocket::stream<tcp::socket> ws{ioc};
 
     // Look up the domain name
-    auto const lookup = resolver.async_resolve({host, port}, yield[ec]);
+    auto const results = resolver.async_resolve(host, port, yield[ec]);
     if(ec)
         return fail(ec, "resolve");
 
     // Make the connection on the IP address we get from a lookup
-    boost::asio::async_connect(ws.next_layer(), lookup, yield[ec]);
+    boost::asio::async_connect(ws.next_layer(), results.begin(), results.end(), yield[ec]);
     if(ec)
         return fail(ec, "connect");
 
@@ -106,21 +106,21 @@ int main(int argc, char** argv)
     auto const port = argv[2];
     auto const text = 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;
 
     // Launch the asynchronous operation
-    boost::asio::spawn(ios, std::bind(
+    boost::asio::spawn(ioc, std::bind(
         &do_session,
         std::string(host),
         std::string(port),
         std::string(text),
-        std::ref(ios),
+        std::ref(ioc),
         std::placeholders::_1));
 
     // Run the I/O service. The call will return when
     // the get operation is complete.
-    ios.run();
+    ioc.run();
 
     return EXIT_SUCCESS;
 }