60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
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// Boost.Signals2 library
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// Copyright Frank Mori Hess 2007,2009.
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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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// Compatibility class to ease porting from the original
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// Boost.Signals library. However,
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// boost::signals2::trackable is NOT thread-safe.
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// For more information, see http://www.boost.org
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#ifndef BOOST_SIGNALS2_TRACKABLE_HPP
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#define BOOST_SIGNALS2_TRACKABLE_HPP
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#include <boost/assert.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/weak_ptr.hpp>
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namespace boost {
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namespace signals2 {
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namespace detail
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{
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class tracked_objects_visitor;
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// trackable_pointee is used to identify the tracked shared_ptr
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// originating from the signals2::trackable class. These tracked
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// shared_ptr are special in that we shouldn't bother to
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// increment their use count during signal invocation, since
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// they don't actually control the lifetime of the
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// signals2::trackable object they are associated with.
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class trackable_pointee
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{};
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}
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class trackable {
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protected:
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trackable(): _tracked_ptr(static_cast<detail::trackable_pointee*>(0)) {}
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trackable(const trackable &): _tracked_ptr(static_cast<detail::trackable_pointee*>(0)) {}
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trackable& operator=(const trackable &)
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{
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return *this;
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}
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~trackable() {}
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private:
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friend class detail::tracked_objects_visitor;
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weak_ptr<detail::trackable_pointee> get_weak_ptr() const
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{
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return _tracked_ptr;
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}
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shared_ptr<detail::trackable_pointee> _tracked_ptr;
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};
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} // end namespace signals2
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} // end namespace boost
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#endif // BOOST_SIGNALS2_TRACKABLE_HPP
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