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diff --git a/src/output/Wrapper.hxx b/src/output/Wrapper.hxx
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+/*
+ * Copyright (C) 2003-2015 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_OUTPUT_WRAPPER_HXX
+#define MPD_OUTPUT_WRAPPER_HXX
+
+#include "util/Cast.hxx"
+
+struct ConfigBlock;
+
+template<class T>
+struct AudioOutputWrapper {
+ static T &Cast(AudioOutput &ao) {
+ return ContainerCast(ao, &T::base);
+ }
+
+ static AudioOutput *Init(const ConfigBlock &block, Error &error) {
+ T *t = T::Create(block, error);
+ return t != nullptr
+ ? &t->base
+ : nullptr;
+ }
+
+ static void Finish(AudioOutput *ao) {
+ T *t = &Cast(*ao);
+ delete t;
+ }
+
+ static bool Enable(AudioOutput *ao, Error &error) {
+ T &t = Cast(*ao);
+ return t.Enable(error);
+ }
+
+ static void Disable(AudioOutput *ao) {
+ T &t = Cast(*ao);
+ t.Disable();
+ }
+
+ static bool Open(AudioOutput *ao, AudioFormat &audio_format,
+ Error &error) {
+ T &t = Cast(*ao);
+ return t.Open(audio_format, error);
+ }
+
+ static void Close(AudioOutput *ao) {
+ T &t = Cast(*ao);
+ t.Close();
+ }
+
+ gcc_pure
+ static unsigned Delay(AudioOutput *ao) {
+ T &t = Cast(*ao);
+ return t.Delay();
+ }
+
+ gcc_pure
+ static void SendTag(AudioOutput *ao, const Tag &tag) {
+ T &t = Cast(*ao);
+ t.SendTag(tag);
+ }
+
+ static size_t Play(AudioOutput *ao, const void *chunk, size_t size,
+ Error &error) {
+ T &t = Cast(*ao);
+ return t.Play(chunk, size, error);
+ }
+
+ static void Drain(AudioOutput *ao) {
+ T &t = Cast(*ao);
+ t.Drain();
+ }
+
+ static void Cancel(AudioOutput *ao) {
+ T &t = Cast(*ao);
+ t.Cancel();
+ }
+
+ gcc_pure
+ static bool Pause(AudioOutput *ao) {
+ T &t = Cast(*ao);
+ return t.Pause();
+ }
+};
+
+#endif