Junxiao Shi
142 lines
3.3 KiB
C++
142 lines
3.3 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/**
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* Copyright (c) 2014-2015, Regents of the University of California,
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* Arizona Board of Regents,
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* Colorado State University,
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* University Pierre & Marie Curie, Sorbonne University,
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* Washington University in St. Louis,
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* Beijing Institute of Technology,
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* The University of Memphis.
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*
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* This file is part of NFD (Named Data Networking Forwarding Daemon).
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* See AUTHORS.md for complete list of NFD authors and contributors.
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*
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* NFD is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef NFD_CORE_COUNTER_HPP
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#define NFD_CORE_COUNTER_HPP
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#include "common.hpp"
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namespace nfd {
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/** \brief represents a counter that encloses an integer value
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*
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* SimpleCounter is noncopyable, because increment should be called on the counter,
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* not a copy of it; it's implicitly convertible to an integral type to be observed
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*/
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class SimpleCounter
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{
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public:
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typedef uint64_t rep;
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constexpr
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SimpleCounter()
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: m_value(0)
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{
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}
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SimpleCounter(const SimpleCounter&) = delete;
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SimpleCounter&
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operator=(const SimpleCounter&) = delete;
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/** \brief observe the counter
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*/
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operator rep() const
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{
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return m_value;
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}
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/** \brief replace the counter value
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*/
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void
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set(rep value)
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{
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m_value = value;
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}
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protected:
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rep m_value;
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};
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/** \brief represents a counter of number of packets
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*
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* \warning The counter value may wrap after exceeding the range of underlying integer type.
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*/
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class PacketCounter : public SimpleCounter
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{
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public:
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/** \brief increment the counter by one
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*/
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PacketCounter&
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operator++()
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{
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++m_value;
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return *this;
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}
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// postfix ++ operator is not provided because it's not needed
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};
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/** \brief represents a counter of number of bytes
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*
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* \warning The counter value may wrap after exceeding the range of underlying integer type.
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*/
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class ByteCounter : public SimpleCounter
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{
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public:
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/** \brief increase the counter
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*/
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ByteCounter&
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operator+=(rep n)
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{
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m_value += n;
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return *this;
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}
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};
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/** \brief provides a counter that observes the size of a table
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* \tparam T a type that provides a size() const member function
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*/
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template<typename T>
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class SizeCounter
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{
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public:
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typedef size_t rep;
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constexpr
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SizeCounter(const T& table)
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: m_table(table)
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{
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}
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SizeCounter(const SizeCounter&) = delete;
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SizeCounter&
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operator=(const SizeCounter&) = delete;
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/** \brief observe the counter
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*/
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operator rep() const
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{
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return m_table.size();
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}
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private:
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const T& m_table;
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};
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} // namespace nfd
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#endif // NFD_CORE_COUNTER_HPP
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