container-with-on-empty-signal.hpp

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

#include "../common.hpp"
#include "../util/signal.hpp"

namespace ndn {

template<class T>
class ContainerWithOnEmptySignal
{
public:
  typedef std::list<T> Base;
  typedef typename Base::value_type value_type;
  typedef typename Base::iterator iterator;

  iterator
  begin()
  {
    return m_container.begin();
  }

  iterator
  end()
  {
    return m_container.end();
  }

  size_t
  size()
  {
    return m_container.size();
  }

  bool
  empty()
  {
    return m_container.empty();
  }

  iterator
  erase(iterator item)
  {
    iterator next = m_container.erase(item);
    if (empty()) {
      this->onEmpty();
    }
    return next;
  }

  void
  clear()
  {
    m_container.clear();
    this->onEmpty();
  }

  std::pair<iterator, bool>
  insert(const value_type& value)
  {
    return {m_container.insert(end(), value), true};
  }

  template<class Predicate>
  void remove_if(Predicate p)
  {
    m_container.remove_if(p);
    if (empty()) {
      this->onEmpty();
    }
  }

public:
  Base m_container;

  util::Signal<ContainerWithOnEmptySignal<T>> onEmpty;
};

} // namespace ndn

#endif // NDN_DETAIL_CONTAINER_WITH_ON_EMPTY_SIGNAL_HPP