99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
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// Boost.Signals2 library
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// Copyright Frank Mori Hess 2007-2008.
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// Copyright Timmo Stange 2007.
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// Copyright Douglas Gregor 2001-2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org
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#ifndef BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
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#define BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
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#include <boost/core/ref.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/signals2/detail/signals_common.hpp>
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#include <boost/signals2/slot_base.hpp>
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#include <boost/signals2/trackable.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/type_traits/remove_pointer.hpp>
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#include <boost/utility/addressof.hpp>
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namespace boost
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{
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namespace signals2
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{
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namespace detail
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{
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// Visitor to collect tracked objects from a bound function.
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class tracked_objects_visitor
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{
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public:
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tracked_objects_visitor(slot_base *slot) : slot_(slot)
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{}
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template<typename T>
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void operator()(const T& t) const
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{
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m_visit_reference_wrapper(t, mpl::bool_<is_reference_wrapper<T>::value>());
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}
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private:
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template<typename T>
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void m_visit_reference_wrapper(const reference_wrapper<T> &t, const mpl::bool_<true> &) const
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{
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m_visit_pointer(t.get_pointer(), mpl::bool_<true>());
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}
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template<typename T>
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void m_visit_reference_wrapper(const T &t, const mpl::bool_<false> &) const
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{
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m_visit_pointer(t, mpl::bool_<is_pointer<T>::value>());
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}
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template<typename T>
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void m_visit_pointer(const T &t, const mpl::bool_<true> &) const
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{
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m_visit_not_function_pointer(t, mpl::bool_<!is_function<typename remove_pointer<T>::type>::value>());
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}
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template<typename T>
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void m_visit_pointer(const T &t, const mpl::bool_<false> &) const
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{
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m_visit_pointer(boost::addressof(t), mpl::bool_<true>());
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}
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template<typename T>
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void m_visit_not_function_pointer(const T *t, const mpl::bool_<true> &) const
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{
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m_visit_signal(t, mpl::bool_<is_signal<T>::value>());
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}
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template<typename T>
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void m_visit_not_function_pointer(const T &, const mpl::bool_<false> &) const
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{}
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template<typename T>
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void m_visit_signal(const T *signal, const mpl::bool_<true> &) const
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{
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if(signal)
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slot_->track_signal(*signal);
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}
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template<typename T>
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void m_visit_signal(const T &t, const mpl::bool_<false> &) const
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{
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add_if_trackable(t);
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}
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void add_if_trackable(const trackable *trackable) const
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{
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if(trackable)
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slot_->_tracked_objects.push_back(trackable->get_weak_ptr());
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}
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void add_if_trackable(const void *) const {}
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mutable slot_base * slot_;
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};
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} // end namespace detail
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} // end namespace signals2
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} // end namespace boost
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#endif // BOOST_SIGNALS2_TRACKED_OBJECTS_VISITOR_HPP
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