upnp: add class UpnpCallback

Each Upnp*Async() call passes a new cookie pointer, and the cookie
passed to UpnpRegisterClient() appears to be ignored.  Using this
interface is a more elegant approach than having one single "handler"
function.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/lib/upnp/Callback.hxx b/src/lib/upnp/Callback.hxx
new file mode 100644
index 000000000..85daf0a7e
--- /dev/null
+++ b/src/lib/upnp/Callback.hxx
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_UPNP_CALLBACK_HXX
+#define MPD_UPNP_CALLBACK_HXX
+
+#include <upnp/upnp.h>
+
+/**
+ * A class that is supposed to be used for libupnp asynchronous
+ * callbacks.
+ */
+class UpnpCallback {
+public:
+	/**
+	 * Pass this value as "cookie" pointer to libupnp asynchronous
+	 * functions.
+	 */
+	void *GetUpnpCookie() {
+		return this;
+	}
+
+	static UpnpCallback &FromUpnpCookie(void *cookie) {
+		return *(UpnpCallback *)cookie;
+	}
+
+	virtual int Invoke(Upnp_EventType et, void *evp) = 0;
+};
+
+#endif