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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/signals/trackable.hpp
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+// Boost.Signals library
+
+// 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_SIGNALS_TRACKABLE_HPP
+#define BOOST_SIGNALS_TRACKABLE_HPP
+
+#include <boost/type_traits.hpp>
+#include <boost/signals/connection.hpp>
+#include <boost/ref.hpp>
+#include <boost/utility/addressof.hpp>
+#include <list>
+#include <vector>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+
+namespace BOOST_SIGNALS_NAMESPACE {
+ // Base class for "trackable" objects that can be tracked when they are
+ // bound in slot target functions. When a trackable object is destroyed,
+ // the signal/slot connections are disconnected automatically.
+ class BOOST_SIGNALS_DECL trackable {
+ private:
+ static void signal_disconnected(void* obj, void* data);
+
+ friend class detail::signal_base_impl;
+ friend class detail::slot_base;
+ void signal_connected(connection, BOOST_SIGNALS_NAMESPACE::detail::bound_object&) const;
+
+ protected:
+ trackable() : connected_signals(), dying(false) {}
+ trackable(const trackable&) : connected_signals(), dying(false) {}
+ ~trackable();
+
+ trackable& operator=(const trackable&)
+ {
+ dying = true;
+ connected_signals.clear();
+ dying = false;
+ return *this;
+ }
+
+ private:
+ typedef std::list<connection> connection_list;
+ typedef connection_list::iterator connection_iterator;
+
+ // List of connections that this object is part of
+ mutable connection_list connected_signals;
+
+ // True when the object is being destroyed
+ mutable bool dying;
+ };
+
+ namespace detail {
+ template<bool Cond> struct truth {};
+
+ // A visitor that adds each trackable object to a vector
+ class bound_objects_visitor {
+ public:
+ bound_objects_visitor(std::vector<const trackable*>& v) :
+ bound_objects(v)
+ {
+ }
+
+ template<typename T>
+ void operator()(const T& t) const
+ {
+ decode(t, 0);
+ }
+
+ private:
+ // decode() decides between a reference wrapper and anything else
+ template<typename T>
+ void decode(const reference_wrapper<T>& t, int) const
+ {
+ add_if_trackable(t.get_pointer());
+ }
+
+ template<typename T>
+ void decode(const T& t, long) const
+ {
+ typedef truth<(is_pointer<T>::value)> is_a_pointer;
+ maybe_get_pointer(t, is_a_pointer());
+ }
+
+ // maybe_get_pointer() decides between a pointer and a non-pointer
+ template<typename T>
+ void maybe_get_pointer(const T& t, truth<true>) const
+ {
+ add_if_trackable(t);
+ }
+
+ template<typename T>
+ void maybe_get_pointer(const T& t, truth<false>) const
+ {
+ // Take the address of this object, because the object itself may be
+ // trackable
+ add_if_trackable(boost::addressof(t));
+ }
+
+ // add_if_trackable() adds trackable objects to the list of bound objects
+ inline void add_if_trackable(const trackable* b) const
+ {
+ if (b) {
+ bound_objects.push_back(b);
+ }
+ }
+
+ inline void add_if_trackable(const void*) const { }
+
+ template<typename R>
+ inline void add_if_trackable(R (*)()) const { }
+
+ template<typename R, typename T1>
+ inline void add_if_trackable(R (*)(T1)) const { }
+
+ template<typename R, typename T1, typename T2>
+ inline void add_if_trackable(R (*)(T1, T2)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3>
+ inline void add_if_trackable(R (*)(T1, T2, T3)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4>
+ inline void add_if_trackable(R (*)(T1, T2, T3, T4)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4,
+ typename T5>
+ inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4,
+ typename T5, typename T6>
+ inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4,
+ typename T5, typename T6, typename T7>
+ inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4,
+ typename T5, typename T6, typename T7, typename T8>
+ inline void
+ add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7, T8)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4,
+ typename T5, typename T6, typename T7, typename T8, typename T9>
+ inline void
+ add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9)) const { }
+
+ template<typename R, typename T1, typename T2, typename T3, typename T4,
+ typename T5, typename T6, typename T7, typename T8, typename T9,
+ typename T10>
+ inline void
+ add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)) const { }
+
+ std::vector<const trackable*>& bound_objects;
+ };
+ } // end namespace detail
+} // end namespace BOOST_SIGNALS_NAMESPACE
+
+} // end namespace boost
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_SIGNALS_TRACKABLE_HPP