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authorMax Kellermann <max@duempel.org>2013-01-29 23:20:19 +0100
committerMax Kellermann <max@duempel.org>2013-01-29 23:20:19 +0100
commitba51045d9e85b8e48afed629d6d87ac3338acd46 (patch)
tree01449b65415f9cd93212ad4c673d783b01b36ba2 /src/util/RefCount.hxx
parentfa34dd7bd3e0222811010dda6d1b40c4e3b3291b (diff)
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refcount: convert to C++
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diff --git a/src/util/RefCount.hxx b/src/util/RefCount.hxx
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+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** \file
+ *
+ * A very simple reference counting library.
+ */
+
+#ifndef MPD_REFCOUNT_HXX
+#define MPD_REFCOUNT_HXX
+
+#include <atomic>
+
+class RefCount {
+ std::atomic_uint n;
+
+public:
+ constexpr RefCount():n(1) {}
+
+ void Increment() {
+ ++n;
+ }
+
+ /**
+ * @return true if the number of references has been dropped to 0
+ */
+ bool Decrement() {
+ return --n == 0;
+ }
+};
+
+#endif