counter.hpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2014-2019, Regents of the University of California,
4  * Arizona Board of Regents,
5  * Colorado State University,
6  * University Pierre & Marie Curie, Sorbonne University,
7  * Washington University in St. Louis,
8  * Beijing Institute of Technology,
9  * The University of Memphis.
10  *
11  * This file is part of NFD (Named Data Networking Forwarding Daemon).
12  * See AUTHORS.md for complete list of NFD authors and contributors.
13  *
14  * NFD is free software: you can redistribute it and/or modify it under the terms
15  * of the GNU General Public License as published by the Free Software Foundation,
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20  * PURPOSE. See the GNU General Public License for more details.
21  *
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23  * NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
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25 
26 #ifndef NFD_DAEMON_COMMON_COUNTER_HPP
27 #define NFD_DAEMON_COMMON_COUNTER_HPP
28 
29 #include "core/common.hpp"
30 
31 namespace nfd {
32 
38 class SimpleCounter : noncopyable
39 {
40 public:
41  typedef uint64_t rep;
42 
45  operator rep() const noexcept
46  {
47  return m_value;
48  }
49 
52  void
53  set(rep value) noexcept
54  {
55  m_value = value;
56  }
57 
58 protected:
59  rep m_value = 0;
60 };
61 
67 {
68 public:
72  operator++() noexcept
73  {
74  ++m_value;
75  return *this;
76  }
77  // postfix ++ operator is not provided because it's not needed
78 };
79 
84 class ByteCounter : public SimpleCounter
85 {
86 public:
90  operator+=(rep n) noexcept
91  {
92  m_value += n;
93  return *this;
94  }
95 };
96 
102 template<typename T>
103 class SizeCounter : noncopyable
104 {
105 public:
106  typedef size_t Rep;
107 
108  explicit constexpr
109  SizeCounter(const T* table = nullptr) noexcept
110  : m_table(table)
111  {
112  }
113 
114  void
115  observe(const T* table) noexcept
116  {
117  m_table = table;
118  }
119 
122  operator Rep() const
123  {
124  BOOST_ASSERT(m_table != nullptr);
125  return m_table->size();
126  }
127 
128 private:
129  const T* m_table;
130 };
131 
132 } // namespace nfd
133 
134 #endif // NFD_DAEMON_COMMON_COUNTER_HPP
represents a counter of number of bytes
Definition: counter.hpp:84
provides a counter that observes the size of a table
Definition: counter.hpp:103
ByteCounter & operator+=(rep n) noexcept
increase the counter
Definition: counter.hpp:90
represents a counter that encloses an integer value
Definition: counter.hpp:38
PacketCounter & operator++() noexcept
increment the counter by one
Definition: counter.hpp:72
represents a counter of number of packets
Definition: counter.hpp:66
Copyright (c) 2014-2015, Regents of the University of California, Arizona Board of Regents...
Definition: algorithm.hpp:32
constexpr SizeCounter(const T *table=nullptr) noexcept
Definition: counter.hpp:109
void observe(const T *table) noexcept
Definition: counter.hpp:115