// Boost.Signals2 library | |
// Copyright Frank Mori Hess 2007-2008. | |
// Copyright Timmo Stange 2007. | |
// Copyright Douglas Gregor 2001-2004. 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_TRACKED_OBJECTS_VISITOR_HPP | |
#define BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP | |
#include <boost/mpl/bool.hpp> | |
#include <boost/ref.hpp> | |
#include <boost/signals2/detail/signals_common.hpp> | |
#include <boost/signals2/slot_base.hpp> | |
#include <boost/signals2/trackable.hpp> | |
#include <boost/type_traits/is_function.hpp> | |
#include <boost/type_traits/is_pointer.hpp> | |
#include <boost/type_traits/remove_pointer.hpp> | |
#include <boost/utility/addressof.hpp> | |
namespace boost | |
{ | |
namespace signals2 | |
{ | |
namespace detail | |
{ | |
// Visitor to collect tracked objects from a bound function. | |
class tracked_objects_visitor | |
{ | |
public: | |
tracked_objects_visitor(slot_base *slot) : slot_(slot) | |
{} | |
template<typename T> | |
void operator()(const T& t) const | |
{ | |
m_visit_reference_wrapper(t, mpl::bool_<is_reference_wrapper<T>::value>()); | |
} | |
private: | |
template<typename T> | |
void m_visit_reference_wrapper(const reference_wrapper<T> &t, const mpl::bool_<true> &) const | |
{ | |
m_visit_pointer(t.get_pointer(), mpl::bool_<true>()); | |
} | |
template<typename T> | |
void m_visit_reference_wrapper(const T &t, const mpl::bool_<false> &) const | |
{ | |
m_visit_pointer(t, mpl::bool_<is_pointer<T>::value>()); | |
} | |
template<typename T> | |
void m_visit_pointer(const T &t, const mpl::bool_<true> &) const | |
{ | |
m_visit_not_function_pointer(t, mpl::bool_<!is_function<typename remove_pointer<T>::type>::value>()); | |
} | |
template<typename T> | |
void m_visit_pointer(const T &t, const mpl::bool_<false> &) const | |
{ | |
m_visit_pointer(boost::addressof(t), mpl::bool_<true>()); | |
} | |
template<typename T> | |
void m_visit_not_function_pointer(const T *t, const mpl::bool_<true> &) const | |
{ | |
m_visit_signal(t, mpl::bool_<is_signal<T>::value>()); | |
} | |
template<typename T> | |
void m_visit_not_function_pointer(const T &, const mpl::bool_<false> &) const | |
{} | |
template<typename T> | |
void m_visit_signal(const T *signal, const mpl::bool_<true> &) const | |
{ | |
if(signal) | |
slot_->track_signal(*signal); | |
} | |
template<typename T> | |
void m_visit_signal(const T &t, const mpl::bool_<false> &) const | |
{ | |
add_if_trackable(t); | |
} | |
void add_if_trackable(const trackable *trackable) const | |
{ | |
if(trackable) | |
slot_->_tracked_objects.push_back(trackable->get_shared_ptr()); | |
} | |
void add_if_trackable(const void *) const {} | |
mutable slot_base * slot_; | |
}; | |
} // end namespace detail | |
} // end namespace signals2 | |
} // end namespace boost | |
#endif // BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP | |