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RefCount.hxx
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1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the
15 * distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
21 * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28 * OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
36 #ifndef MPD_REFCOUNT_HXX
37 #define MPD_REFCOUNT_HXX
38
39 #include <atomic>
40
41 class RefCount {
42 std::atomic_uint n;
43
44 public:
45 #ifndef _LIBCPP_VERSION
46 /* the "constexpr" is missing in libc++'s "atomic"
47 implementation */
48 constexpr
49 #endif
50 RefCount():n(1) {}
51
52 void Increment() {
53 ++n;
54 }
55
59 bool Decrement() {
60 return --n == 0;
61 }
62 };
63
64 #endif
RefCount::RefCount
constexpr RefCount()
Definition: RefCount.hxx:50
RefCount::Increment
void Increment()
Definition: RefCount.hxx:52
RefCount::Decrement
bool Decrement()
Definition: RefCount.hxx:59
RefCount
Definition: RefCount.hxx:41