strategy-info-host.hpp

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

#include "fw/strategy-info.hpp"

namespace nfd {

class StrategyInfoHost
{
public:
  template<typename T>
  T*
  getStrategyInfo() const
  {
    static_assert(std::is_base_of<fw::StrategyInfo, T>::value,
                  "T must inherit from StrategyInfo");

    auto it = m_items.find(T::getTypeId());
    if (it == m_items.end()) {
      return nullptr;
    }
    return static_cast<T*>(it->second.get());
  }

  template<typename T, typename ...A>
  std::pair<T*, bool>
  insertStrategyInfo(A&&... args)
  {
    static_assert(std::is_base_of<fw::StrategyInfo, T>::value,
                  "T must inherit from StrategyInfo");

    unique_ptr<fw::StrategyInfo>& item = m_items[T::getTypeId()];
    bool isNew = (item == nullptr);
    if (isNew) {
      item.reset(new T(std::forward<A>(args)...));
    }
    return {static_cast<T*>(item.get()), isNew};
  }

  template<typename T>
  size_t
  eraseStrategyInfo()
  {
    static_assert(std::is_base_of<fw::StrategyInfo, T>::value,
                  "T must inherit from StrategyInfo");

    return m_items.erase(T::getTypeId());
  }

  void
  clearStrategyInfo();

private:
  std::unordered_map<int, unique_ptr<fw::StrategyInfo>> m_items;
};

} // namespace nfd

#endif // NFD_DAEMON_TABLE_STRATEGY_INFO_HOST_HPP