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// Boost.Signals2 library
// Copyright Douglas Gregor 2001-2004.
// Copyright Frank Mori Hess 2007-2008.
// 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)
// For more information, see http://www.boost.org
#ifndef BOOST_SIGNALS2_SLOT_CALL_ITERATOR_HPP
#define BOOST_SIGNALS2_SLOT_CALL_ITERATOR_HPP
#include <boost/assert.hpp>
#include <boost/aligned_storage.hpp>
#include <boost/core/no_exceptions_support.hpp>
#include <boost/iterator/iterator_facade.hpp>
#include <boost/optional.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/signals2/connection.hpp>
#include <boost/signals2/slot_base.hpp>
#include <boost/signals2/detail/auto_buffer.hpp>
#include <boost/signals2/detail/unique_lock.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/weak_ptr.hpp>
namespace boost {
namespace signals2 {
namespace detail {
template<typename ResultType, typename Function>
class slot_call_iterator_cache
{
public:
slot_call_iterator_cache(const Function &f_arg):
f(f_arg),
connected_slot_count(0),
disconnected_slot_count(0),
m_active_slot(0)
{}
~slot_call_iterator_cache()
{
if(m_active_slot)
{
garbage_collecting_lock<connection_body_base> lock(*m_active_slot);
m_active_slot->dec_slot_refcount(lock);
}
}
template<typename M>
void set_active_slot(garbage_collecting_lock<M> &lock,
connection_body_base *active_slot)
{
if(m_active_slot)
m_active_slot->dec_slot_refcount(lock);
m_active_slot = active_slot;
if(m_active_slot)
m_active_slot->inc_slot_refcount(lock);
}
optional<ResultType> result;
typedef auto_buffer<void_shared_ptr_variant, store_n_objects<10> > tracked_ptrs_type;
tracked_ptrs_type tracked_ptrs;
Function f;
unsigned connected_slot_count;
unsigned disconnected_slot_count;
connection_body_base *m_active_slot;
};
// Generates a slot call iterator. Essentially, this is an iterator that:
// - skips over disconnected slots in the underlying list
// - calls the connected slots when dereferenced
// - caches the result of calling the slots
template<typename Function, typename Iterator, typename ConnectionBody>
class slot_call_iterator_t
: public boost::iterator_facade<slot_call_iterator_t<Function, Iterator, ConnectionBody>,
typename Function::result_type,
boost::single_pass_traversal_tag,
typename boost::add_const<typename boost::add_reference<typename Function::result_type>::type>::type >
{
typedef boost::iterator_facade<slot_call_iterator_t<Function, Iterator, ConnectionBody>,
typename Function::result_type,
boost::single_pass_traversal_tag,
typename boost::add_const<typename boost::add_reference<typename Function::result_type>::type>::type >
inherited;
typedef typename Function::result_type result_type;
typedef slot_call_iterator_cache<result_type, Function> cache_type;
friend class boost::iterator_core_access;
public:
slot_call_iterator_t(Iterator iter_in, Iterator end_in,
cache_type &c):
iter(iter_in), end(end_in),
cache(&c), callable_iter(end_in)
{
lock_next_callable();
}
typename inherited::reference
dereference() const
{
if (!cache->result) {
BOOST_TRY
{
cache->result.reset(cache->f(*iter));
}
BOOST_CATCH(expired_slot &)
{
(*iter)->disconnect();
BOOST_RETHROW
}
BOOST_CATCH_END
}
return cache->result.get();
}
void increment()
{
++iter;
lock_next_callable();
cache->result.reset();
}
bool equal(const slot_call_iterator_t& other) const
{
return iter == other.iter;
}
private:
typedef garbage_collecting_lock<connection_body_base> lock_type;
void set_callable_iter(lock_type &lock, Iterator newValue) const
{
callable_iter = newValue;
if(callable_iter == end)
cache->set_active_slot(lock, 0);
else
cache->set_active_slot(lock, (*callable_iter).get());
}
void lock_next_callable() const
{
if(iter == callable_iter)
{
return;
}
if(iter == end)
{
if(callable_iter != end)
{
lock_type lock(**callable_iter);
set_callable_iter(lock, end);
return;
}
}
// we're only locking the first connection body,
// but it doesn't matter they all use the same mutex
lock_type lock(**iter);
for(;iter != end; ++iter)
{
cache->tracked_ptrs.clear();
(*iter)->nolock_grab_tracked_objects(lock, std::back_inserter(cache->tracked_ptrs));
if((*iter)->nolock_nograb_connected())
{
++cache->connected_slot_count;
}else
{
++cache->disconnected_slot_count;
}
if((*iter)->nolock_nograb_blocked() == false)
{
set_callable_iter(lock, iter);
break;
}
}
if(iter == end)
{
set_callable_iter(lock, end);
}
}
mutable Iterator iter;
Iterator end;
cache_type *cache;
mutable Iterator callable_iter;
};
} // end namespace detail
} // end namespace BOOST_SIGNALS_NAMESPACE
} // end namespace boost
#endif // BOOST_SIGNALS2_SLOT_CALL_ITERATOR_HPP
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