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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2017 Red Hat, Inc. | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef CEPH_COUNTER_H | |
16 | #define CEPH_COUNTER_H | |
17 | ||
18 | template <typename T> | |
19 | class Counter { | |
20 | public: | |
21 | Counter() { | |
22 | _count()++; | |
23 | _increments()++; | |
24 | } | |
25 | Counter(const Counter &rhs) { | |
26 | _count()++; | |
27 | _increments()++; | |
28 | } | |
29 | Counter(Counter &&rhs) {} | |
30 | ~Counter() { | |
31 | _count()--; | |
32 | } | |
33 | static unsigned long count() { | |
34 | return _count(); | |
35 | } | |
36 | static unsigned long increments() { | |
37 | return _increments(); | |
38 | } | |
39 | static unsigned long decrements() { | |
40 | return increments()-count(); | |
41 | } | |
42 | ||
43 | private: | |
44 | static unsigned long &_count() { | |
45 | static unsigned long c; | |
46 | return c; | |
47 | } | |
48 | static unsigned long &_increments() { | |
49 | static unsigned long i; | |
50 | return i; | |
51 | } | |
52 | }; | |
53 | ||
54 | #endif |