event/DeferredCall: new class supposed to replace DeferredMonitor

Makefile.am

@@ -494,6 +494,7 @@ libevent_a_SOURCES = \
 	src/event/TimeoutMonitor.hxx src/event/TimeoutMonitor.cxx \
 	src/event/IdleMonitor.hxx src/event/IdleMonitor.cxx \
 	src/event/DeferredMonitor.hxx src/event/DeferredMonitor.cxx \
+	src/event/DeferredCall.hxx \
 	src/event/MaskMonitor.hxx src/event/MaskMonitor.cxx \
 	src/event/SocketMonitor.cxx src/event/SocketMonitor.hxx \
 	src/event/BufferedSocket.cxx src/event/BufferedSocket.hxx \

src/event/DeferredCall.hxx

+/*
+ * Copyright 2003-2016 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_EVENT_DEFERRED_CALL_HXX
+#define MPD_EVENT_DEFERRED_CALL_HXX
+
+#include "check.h"
+#include "DeferredMonitor.hxx"
+#include "util/BindMethod.hxx"
+
+/**
+ * Invoke a method call in the #EventLoop.
+ *
+ * This class is thread-safe.
+ */
+class DeferredCall final : DeferredMonitor {
+	typedef BoundMethod<void()> Callback;
+	const Callback callback;
+
+public:
+	DeferredCall(EventLoop &_loop, Callback _callback)
+		:DeferredMonitor(_loop), callback(_callback) {}
+
+	using DeferredMonitor::GetEventLoop;
+	using DeferredMonitor::Schedule;
+	using DeferredMonitor::Cancel;
+
+protected:
+	void RunDeferred() override {
+		callback();
+	}
+};
+
+#endif