Chris@16: // DEPRECATED in favor of adl_postconstruct and adl_predestruct with
Chris@16: // deconstruct<T>().
Chris@16: // A factory function for creating a shared_ptr that enhances the plain
Chris@16: // shared_ptr constructors by adding support for postconstructors
Chris@16: // and predestructors through the boost::signals2::postconstructible and
Chris@16: // boost::signals2::predestructible base classes.
Chris@16: //
Chris@16: // Copyright Frank Mori Hess 2007-2008.
Chris@16: //
Chris@16: // Use, modification and
Chris@16: // distribution is subject to the Boost Software License, Version
Chris@16: // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_SIGNALS2_DECONSTRUCT_PTR_HPP
Chris@16: #define BOOST_SIGNALS2_DECONSTRUCT_PTR_HPP
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/checked_delete.hpp>
Chris@16: #include <boost/signals2/postconstructible.hpp>
Chris@16: #include <boost/signals2/predestructible.hpp>
Chris@16: #include <boost/shared_ptr.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:   namespace signals2
Chris@16:   {
Chris@16:     namespace detail
Chris@16:     {
Chris@16:       extern inline void do_postconstruct(const postconstructible *ptr)
Chris@16:       {
Chris@16:         postconstructible *nonconst_ptr = const_cast<postconstructible*>(ptr);
Chris@16:         nonconst_ptr->postconstruct();
Chris@16:       }
Chris@16:       extern inline void do_postconstruct(...)
Chris@16:       {
Chris@16:       }
Chris@16:       extern inline void do_predestruct(...)
Chris@16:       {
Chris@16:       }
Chris@16:       extern inline void do_predestruct(const predestructible *ptr)
Chris@16:       {
Chris@16:         try
Chris@16:         {
Chris@16:           predestructible *nonconst_ptr = const_cast<predestructible*>(ptr);
Chris@16:           nonconst_ptr->predestruct();
Chris@16:         }
Chris@16:         catch(...)
Chris@16:         {
Chris@16:           BOOST_ASSERT(false);
Chris@16:         }
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:     template<typename T> class predestructing_deleter
Chris@16:     {
Chris@16:     public:
Chris@16:       void operator()(const T *ptr) const
Chris@16:       {
Chris@16:         detail::do_predestruct(ptr);
Chris@16:         checked_delete(ptr);
Chris@16:       }
Chris@16:     };
Chris@16: 
Chris@16:     template<typename T>
Chris@16:     shared_ptr<T> deconstruct_ptr(T *ptr)
Chris@16:     {
Chris@16:       if(ptr == 0) return shared_ptr<T>(ptr);
Chris@16:       shared_ptr<T> shared(ptr, boost::signals2::predestructing_deleter<T>());
Chris@16:       detail::do_postconstruct(ptr);
Chris@16:       return shared;
Chris@16:     }
Chris@16:     template<typename T, typename D>
Chris@16:     shared_ptr<T> deconstruct_ptr(T *ptr, D deleter)
Chris@16:     {
Chris@16:       shared_ptr<T> shared(ptr, deleter);
Chris@16:       if(ptr == 0) return shared;
Chris@16:       detail::do_postconstruct(ptr);
Chris@16:       return shared;
Chris@16:     }
Chris@16:   }
Chris@16: }
Chris@16: 
Chris@16: #endif // BOOST_SIGNALS2_DECONSTRUCT_PTR_HPP