counter.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NFD_CORE_COUNTER_HPP
#define NFD_CORE_COUNTER_HPP

#include "common.hpp"

namespace nfd {

class SimpleCounter
{
public:
  typedef uint64_t rep;

  constexpr
  SimpleCounter()
    : m_value(0)
  {
  }

  SimpleCounter(const SimpleCounter&) = delete;

  SimpleCounter&
  operator=(const SimpleCounter&) = delete;

  operator rep() const
  {
    return m_value;
  }

  void
  set(rep value)
  {
    m_value = value;
  }

protected:
  rep m_value;
};

class PacketCounter : public SimpleCounter
{
public:
  PacketCounter&
  operator++()
  {
    ++m_value;
    return *this;
  }
  // postfix ++ operator is not provided because it's not needed
};

class ByteCounter : public SimpleCounter
{
public:
  ByteCounter&
  operator+=(rep n)
  {
    m_value += n;
    return *this;
  }
};

template<typename T>
class SizeCounter
{
public:
  typedef size_t Rep;

  explicit constexpr
  SizeCounter(const T* table = nullptr)
    : m_table(table)
  {
  }

  SizeCounter(const SizeCounter&) = delete;

  SizeCounter&
  operator=(const SizeCounter&) = delete;

  void
  observe(const T* table)
  {
    m_table = table;
  }

  operator Rep() const
  {
    BOOST_ASSERT(m_table != nullptr);
    return m_table->size();
  }

private:
  const T* m_table;
};

} // namespace nfd

#endif // NFD_CORE_COUNTER_HPP