dbf9e800
 Hu Chunming
提交_GLIBCXX_USE_CX...
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// Boost.Signals2 library
// Copyright Frank Mori Hess 2007,2009.
// 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)
// Compatibility class to ease porting from the original
// Boost.Signals library. However,
// boost::signals2::trackable is NOT thread-safe.
// For more information, see http://www.boost.org
#ifndef BOOST_SIGNALS2_TRACKABLE_HPP
#define BOOST_SIGNALS2_TRACKABLE_HPP
#include <boost/assert.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
namespace boost {
namespace signals2 {
namespace detail
{
class tracked_objects_visitor;
// trackable_pointee is used to identify the tracked shared_ptr
// originating from the signals2::trackable class. These tracked
// shared_ptr are special in that we shouldn't bother to
// increment their use count during signal invocation, since
// they don't actually control the lifetime of the
// signals2::trackable object they are associated with.
class trackable_pointee
{};
}
class trackable {
protected:
trackable(): _tracked_ptr(static_cast<detail::trackable_pointee*>(0)) {}
trackable(const trackable &): _tracked_ptr(static_cast<detail::trackable_pointee*>(0)) {}
trackable& operator=(const trackable &)
{
return *this;
}
~trackable() {}
private:
friend class detail::tracked_objects_visitor;
weak_ptr<detail::trackable_pointee> get_weak_ptr() const
{
return _tracked_ptr;
}
shared_ptr<detail::trackable_pointee> _tracked_ptr;
};
} // end namespace signals2
} // end namespace boost
#endif // BOOST_SIGNALS2_TRACKABLE_HPP
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