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/** \file dynamic_set_impl.h */ // -*-c++-*-
// Copyright (C) 2010 Daniel Burrows
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#ifndef DYNAMIC_SET_IMPL_H
#define DYNAMIC_SET_IMPL_H
#include "dynamic_set.h"
#include "enumerator.h"
#include <sigc++/signal.h>
#include <memory>
#include <unordered_set>
namespace aptitude
{
namespace util
{
/** \brief A dynamic set based on hash tables.
*
* Entries in the set must be compatible with std::hash
* and must support operator==.
*/
template<typename T>
class dynamic_set_impl
: public std::enable_shared_from_this<dynamic_set_impl<T> >,
public writable_dynamic_set<T>
{
std::unordered_set<T> values;
sigc::signal<void, T> signal_inserted;
sigc::signal<void, T> signal_removed;
public:
/** \warning Should only be invoked by make_shared().
*/
dynamic_set_impl();
/** \warning Should only be invoked by make_shared().
*/
template<typename InputIter>
dynamic_set_impl(const InputIter &begin, const InputIter &end);
/** \brief Create an empty dynamic set. */
static std::shared_ptr<dynamic_set_impl> create();
/** \brief Create a dynamic set from a range of values. */
template<typename InputIter>
static std::shared_ptr<dynamic_set_impl>
create(const InputIter &begin, const InputIter &end);
void insert(const T &t);
void remove(const T &t);
std::size_t size();
std::shared_ptr<enumerator<T> > enumerate();
sigc::connection connect_inserted(const sigc::slot<void, T> &slot);
sigc::connection connect_removed(const sigc::slot<void, T> &slot);
};
template<typename T>
dynamic_set_impl<T>::dynamic_set_impl()
{
}
template<typename T>
template<typename InputIter>
dynamic_set_impl<T>::dynamic_set_impl(const InputIter &begin, const InputIter &end)
: values(begin, end)
{
}
template<typename T>
std::shared_ptr<dynamic_set_impl<T> > dynamic_set_impl<T>::create()
{
return std::make_shared<dynamic_set_impl>();
}
template<typename T>
template<typename InputIter>
std::shared_ptr<dynamic_set_impl<T> >
dynamic_set_impl<T>::create(const InputIter &begin, const InputIter &end)
{
return std::make_shared<dynamic_set_impl>(begin, end);
}
template<typename T>
void dynamic_set_impl<T>::insert(const T &t)
{
std::pair<typename std::unordered_set<T>::iterator, bool>
insert_result = values.insert(t);
if(insert_result.second)
signal_inserted(t);
}
template<typename T>
void dynamic_set_impl<T>::remove(const T &t)
{
const std::size_t num_erased = values.erase(t);
if(num_erased > 0)
signal_removed(t);
}
template<typename T>
std::size_t dynamic_set_impl<T>::size()
{
return values.size();
}
template<typename T>
std::shared_ptr<enumerator<T> > dynamic_set_impl<T>::enumerate()
{
typedef typename std::unordered_set<T>::const_iterator Iter;
typedef iterator_enumerator_with_keepalive<Iter, dynamic_set_impl<T> > Enum;
return std::make_shared<Enum>(values.begin(),
values.end(),
this->shared_from_this());
}
template<typename T>
sigc::connection dynamic_set_impl<T>::connect_inserted(const sigc::slot<void, T> &slot)
{
return signal_inserted.connect(slot);
}
template<typename T>
sigc::connection dynamic_set_impl<T>::connect_removed(const sigc::slot<void, T> &slot)
{
return signal_removed.connect(slot);
}
}
}
#endif // DYNAMIC_SET_IMPL_H
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