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/*=============================================================================
Copyright (c) 2002-2003 Joel de Guzman
Copyright (c) 2002-2003 Martin Wille
http://spirit.sourceforge.net/
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined BOOST_SPIRIT_OBJECT_WITH_ID_IPP
#define BOOST_SPIRIT_OBJECT_WITH_ID_IPP
#include <vector>
#include <boost/shared_ptr.hpp>
#ifdef BOOST_SPIRIT_THREADSAFE
#include <boost/thread/mutex.hpp>
#include <boost/thread/lock_types.hpp>
#include <boost/thread/once.hpp>
#endif
#include <boost/spirit/home/classic/namespace.hpp>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit {
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
namespace impl {
//////////////////////////////////
template <typename IdT = std::size_t>
struct object_with_id_base_supply
{
typedef IdT object_id;
typedef std::vector<object_id> id_vector;
object_with_id_base_supply() : max_id(object_id()) {}
#ifdef BOOST_SPIRIT_THREADSAFE
boost::mutex mutex;
#endif
object_id max_id;
id_vector free_ids;
object_id acquire();
void release(object_id);
};
//////////////////////////////////
template <typename TagT, typename IdT = std::size_t>
struct object_with_id_base
{
typedef TagT tag_t;
typedef IdT object_id;
protected:
object_id acquire_object_id();
void release_object_id(object_id);
private:
#ifdef BOOST_SPIRIT_THREADSAFE
static boost::mutex &mutex_instance();
static void mutex_init();
#endif
boost::shared_ptr<object_with_id_base_supply<IdT> > id_supply;
};
//////////////////////////////////
template<class TagT, typename IdT = std::size_t>
struct object_with_id : private object_with_id_base<TagT, IdT>
{
typedef object_with_id<TagT, IdT> self_t;
typedef object_with_id_base<TagT, IdT> base_t;
typedef IdT object_id;
object_with_id() : id(base_t::acquire_object_id()) {}
object_with_id(self_t const &other)
: base_t(other)
, id(base_t::acquire_object_id())
{} // don't copy id
self_t &operator = (self_t const &other)
{ // don't assign id
base_t::operator=(other);
return *this;
}
~object_with_id() { base_t::release_object_id(id); }
object_id get_object_id() const { return id; }
private:
object_id const id;
};
//////////////////////////////////
template <typename IdT>
inline IdT
object_with_id_base_supply<IdT>::acquire()
{
#ifdef BOOST_SPIRIT_THREADSAFE
boost::unique_lock<boost::mutex> lock(mutex);
#endif
if (free_ids.size())
{
object_id id = *free_ids.rbegin();
free_ids.pop_back();
return id;
}
else
{
if (free_ids.capacity()<=max_id)
free_ids.reserve(max_id*3/2+1);
return ++max_id;
}
}
//////////////////////////////////
template <typename IdT>
inline void
object_with_id_base_supply<IdT>::release(IdT id)
{
#ifdef BOOST_SPIRIT_THREADSAFE
boost::unique_lock<boost::mutex> lock(mutex);
#endif
if (max_id == id)
max_id--;
else
free_ids.push_back(id); // doesn't throw
}
//////////////////////////////////
template <typename TagT, typename IdT>
inline IdT
object_with_id_base<TagT, IdT>::acquire_object_id()
{
{
#ifdef BOOST_SPIRIT_THREADSAFE
#ifndef BOOST_THREAD_PROVIDES_ONCE_CXX11
static boost::once_flag been_here = BOOST_ONCE_INIT;
#else
static boost::once_flag been_here;
#endif
boost::call_once(been_here, mutex_init);
boost::mutex &mutex = mutex_instance();
boost::unique_lock<boost::mutex> lock(mutex);
#endif
static boost::shared_ptr<object_with_id_base_supply<IdT> >
static_supply;
if (!static_supply.get())
static_supply.reset(new object_with_id_base_supply<IdT>());
id_supply = static_supply;
}
return id_supply->acquire();
}
//////////////////////////////////
template <typename TagT, typename IdT>
inline void
object_with_id_base<TagT, IdT>::release_object_id(IdT id)
{
id_supply->release(id);
}
//////////////////////////////////
#ifdef BOOST_SPIRIT_THREADSAFE
template <typename TagT, typename IdT>
inline boost::mutex &
object_with_id_base<TagT, IdT>::mutex_instance()
{
static boost::mutex mutex;
return mutex;
}
#endif
//////////////////////////////////
#ifdef BOOST_SPIRIT_THREADSAFE
template <typename TagT, typename IdT>
inline void
object_with_id_base<TagT, IdT>::mutex_init()
{
mutex_instance();
}
#endif
} // namespace impl
///////////////////////////////////////////////////////////////////////////////
BOOST_SPIRIT_CLASSIC_NAMESPACE_END
}} // namespace boost::spirit
#endif
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