updates asio on_tcp_init callback to new api

examples/echo_server/echo_server.cpp

@@ -85,6 +85,10 @@ void on_interrupt(server* s, websocketpp::connection_hdl hdl) {
     std::cout << "on_interrupt called with hdl: " << hdl.lock().get() << std::endl;
 }
 
+void on_tcp_init(websocketpp::connection_hdl hdl) {
+    std::cout << "on_tcp_init called with hdl: " << hdl.lock().get() << std::endl;
+}
+
 using websocketpp::lib::placeholders::_1;
 using websocketpp::lib::bind;
 
@@ -101,6 +105,7 @@ int main() {
     //echo_server.set_open_handler(websocketpp::lib::bind(&test_handler::on_open,t,websocketpp::lib::placeholders::_1));
     echo_server.set_open_handler(bind(&on_open,&echo_server,::_1));
     echo_server.set_interrupt_handler(bind(&on_interrupt,&echo_server,::_1));
+    echo_server.set_tcp_init_handler(&on_tcp_init);
 
 	// Listen
 	echo_server.listen(9002);

websocketpp/transport/asio/connection.hpp

@@ -57,7 +57,6 @@ public:
 
 	class handler_interface : public security_type::handler_interface {
 	public:
-		virtual void on_tcp_init() {};
 	};
 	
 	typedef lib::shared_ptr<handler_interface> handler_ptr;
@@ -120,8 +119,8 @@ protected:
 	}
 	
 	void handle_init(init_handler callback, const lib::error_code& ec) {
-		if (!ec) {
-			m_handler->on_tcp_init();
+		if (m_tcp_init_handler) {
+			m_tcp_init_handler(m_connection_hdl);
 		}
 		
 		callback(ec);

websocketpp/transport/asio/endpoint.hpp

@@ -160,6 +160,9 @@ public:
      * @see WebSocket++ handler documentation for more information about
      * handlers.
      */
+    void set_tcp_init_handler(tcp_init_handler h) {
+        m_tcp_init_handler = h;
+    }
 
 	// listen manually
 	void listen(const boost::asio::ip::tcp::endpoint& e) {