Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of Boost. Click here to view this page for the latest version.


// 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

// Compatibility class to ease porting from the original
// Boost.Signals library.  However,
// boost::signals2::trackable is NOT thread-safe.

// For more information, see


#include <boost/assert.hpp>
#include <boost/shared_ptr.hpp>

namespace boost {
  namespace signals2 {
    namespace detail
        class tracked_objects_visitor;
    class trackable {
      trackable(): _tracked_ptr(static_cast<int*>(0)) {}
      trackable(const trackable &): _tracked_ptr(static_cast<int*>(0)) {}
      trackable& operator=(const trackable &)
          return *this;
      ~trackable() {}
      friend class detail::tracked_objects_visitor;
      const shared_ptr<void>& get_shared_ptr() const
          return _tracked_ptr;

      shared_ptr<void> _tracked_ptr;
  } // end namespace signals2
} // end namespace boost