Chris@16: // (C) Copyright Thorsten Ottosen 2005.
Chris@16: // (C) Copyright Jonathan Turkanis 2004.
Chris@16: // (C) Copyright Daniel Wallin 2004.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // Implementation of the move_ptr from the "Move Proposal" 
Chris@101: // (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1377.htm) 
Chris@16: // enhanced to support custom deleters and safe boolean conversions.
Chris@16: //
Chris@16: // The implementation is based on an implementation by Daniel Wallin, at
Chris@16: // "http://aspn.activestate.com/ASPN/Mail/Message/Attachments/boost/
Chris@16: // 400DC271.1060903@student.umu.se/move_ptr.hpp". The current was adapted 
Chris@16: // by Jonathan Turkanis to incorporating ideas of Howard Hinnant and 
Chris@16: // Rani Sharoni. 
Chris@16: 
Chris@16: #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
Chris@16: #define BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/config.hpp> // Member template friends, put size_t in std.
Chris@16: #include <cstddef>          // size_t
Chris@16: #include <boost/compressed_pair.hpp> 
Chris@16: #include <boost/ptr_container/detail/default_deleter.hpp>       
Chris@16: #include <boost/ptr_container/detail/is_convertible.hpp>       
Chris@16: #include <boost/ptr_container/detail/move.hpp>       
Chris@16: #include <boost/static_assert.hpp>
Chris@16: #include <boost/type_traits/add_reference.hpp>
Chris@16: #include <boost/type_traits/is_array.hpp>
Chris@16: 
Chris@16: #if defined(BOOST_MSVC)
Chris@16: #pragma warning(push)
Chris@16: #pragma warning(disable:4521)        // Multiple copy constuctors.
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost { namespace ptr_container_detail {
Chris@16: 
Chris@16:     
Chris@16: template< typename T, 
Chris@16:           typename Deleter = 
Chris@16:               move_ptrs::default_deleter<T> >
Chris@16: class static_move_ptr 
Chris@16: {
Chris@16: public:
Chris@16: 
Chris@16:     typedef typename remove_bounds<T>::type             element_type;
Chris@16:     typedef Deleter                                     deleter_type;
Chris@16: 
Chris@16: private:
Chris@16:     
Chris@16:     struct safe_bool_helper { int x; };
Chris@16:     typedef int safe_bool_helper::* safe_bool;
Chris@16:     typedef boost::compressed_pair<element_type*, Deleter> impl_type;
Chris@16: 
Chris@16: public:
Chris@16:     typedef typename impl_type::second_reference        deleter_reference;
Chris@16:     typedef typename impl_type::second_const_reference  deleter_const_reference;
Chris@16: 
Chris@16:         // Constructors
Chris@16: 
Chris@16:     static_move_ptr() : impl_(0) { }
Chris@16: 
Chris@16:     static_move_ptr(const static_move_ptr& p)
Chris@16:         : impl_(p.get(), p.get_deleter())    
Chris@16:         { 
Chris@16:             const_cast<static_move_ptr&>(p).release();
Chris@16:         }
Chris@16: 
Chris@16: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))    
Chris@16:     static_move_ptr( const move_ptrs::move_source<static_move_ptr<T,Deleter> >& src )
Chris@16: #else
Chris@16:     static_move_ptr( const move_ptrs::move_source<static_move_ptr>& src )
Chris@16: #endif    
Chris@16:             : impl_(src.ptr().get(), src.ptr().get_deleter())
Chris@16:             {
Chris@16:                 src.ptr().release();
Chris@16:             }
Chris@16:     
Chris@16:     template<typename TT>
Chris@16:     explicit static_move_ptr(TT* tt) 
Chris@16:         : impl_(tt, Deleter()) 
Chris@16:         { }
Chris@16: 
Chris@16:         // Destructor
Chris@16: 
Chris@16:     ~static_move_ptr() { if (ptr()) get_deleter()(ptr()); }
Chris@16: 
Chris@16:         // Assignment
Chris@16: 
Chris@16:     static_move_ptr& operator=(static_move_ptr rhs)
Chris@16:         {
Chris@16:             rhs.swap(*this);
Chris@16:             return *this;
Chris@16:         }
Chris@16: 
Chris@16:         // Smart pointer interface
Chris@16: 
Chris@16:     element_type* get() const { return ptr(); }
Chris@16: 
Chris@16:     element_type& operator*() 
Chris@16:         { 
Chris@16:             /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); 
Chris@16:         }
Chris@16: 
Chris@16:     const element_type& operator*() const 
Chris@16:         { 
Chris@16:             /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); 
Chris@16:         }
Chris@16: 
Chris@16:     element_type* operator->()  
Chris@16:         { 
Chris@16:             /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); 
Chris@16:         }    
Chris@16: 
Chris@16:     const element_type* operator->() const 
Chris@16:         { 
Chris@16:             /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); 
Chris@16:         }    
Chris@16: 
Chris@16: 
Chris@16:     element_type* release()
Chris@16:         {
Chris@16:             element_type* result = ptr();
Chris@16:             ptr() = 0;
Chris@16:             return result;
Chris@16:         }
Chris@16: 
Chris@16:     void reset()
Chris@16:         {
Chris@16:             if (ptr()) get_deleter()(ptr());
Chris@16:             ptr() = 0;
Chris@16:         }
Chris@16: 
Chris@16:     template<typename TT>
Chris@16:     void reset(TT* tt) 
Chris@16:         {
Chris@16:             static_move_ptr(tt).swap(*this);
Chris@16:         }
Chris@16: 
Chris@16:     template<typename TT, typename DD>
Chris@16:     void reset(TT* tt, DD dd) 
Chris@16:         {
Chris@16:             static_move_ptr(tt, dd).swap(*this);
Chris@16:         }
Chris@16: 
Chris@16:     operator safe_bool() const { return ptr() ? &safe_bool_helper::x : 0; }
Chris@16: 
Chris@16:     void swap(static_move_ptr& p) { impl_.swap(p.impl_); }
Chris@16: 
Chris@16:     deleter_reference get_deleter() { return impl_.second(); }
Chris@16: 
Chris@16:     deleter_const_reference get_deleter() const { return impl_.second(); }
Chris@16: private:
Chris@16:     template<typename TT, typename DD>
Chris@16:     void check(const static_move_ptr<TT, DD>& ptr)
Chris@16:         {
Chris@16:             typedef move_ptrs::is_smart_ptr_convertible<TT, T> convertible;
Chris@16:             BOOST_STATIC_ASSERT(convertible::value);
Chris@16:         }   
Chris@16: 
Chris@16: #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) || defined(BOOST_NO_SFINAE)
Chris@16: // give up on this behavior
Chris@16: #else 
Chris@16: 
Chris@16:     template<typename Ptr> struct cant_move_from_const;
Chris@16: 
Chris@16:     template<typename TT, typename DD> 
Chris@16:     struct cant_move_from_const< const static_move_ptr<TT, DD> > { 
Chris@16:         typedef typename static_move_ptr<TT, DD>::error type; 
Chris@16:     };
Chris@16: 
Chris@16:     template<typename Ptr> 
Chris@16:     static_move_ptr(Ptr&, typename cant_move_from_const<Ptr>::type = 0);
Chris@16: 
Chris@16: 
Chris@16: public:
Chris@16:     static_move_ptr(static_move_ptr&);
Chris@16: 
Chris@16:     
Chris@16: private:
Chris@16:     template<typename TT, typename DD>
Chris@16:     static_move_ptr( static_move_ptr<TT, DD>&,
Chris@16:                      typename 
Chris@16:                      move_ptrs::enable_if_convertible<
Chris@16:                          TT, T, static_move_ptr&
Chris@16:                      >::type::type* = 0 );
Chris@16: 
Chris@16: #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING || BOOST_NO_SFINAE
Chris@16: 
Chris@16: //#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
Chris@16: //    template<typename TT, typename DD>
Chris@16: //    friend class static_move_ptr;
Chris@16: //#else
Chris@16:     public:
Chris@16: //#endif
Chris@16:     typename impl_type::first_reference 
Chris@16:     ptr() { return impl_.first(); } 
Chris@16: 
Chris@16:     typename impl_type::first_const_reference 
Chris@16:     ptr() const { return impl_.first(); }
Chris@16: 
Chris@16:     impl_type impl_;
Chris@16: };
Chris@16: 
Chris@16: } // namespace ptr_container_detail
Chris@16: } // End namespace boost.
Chris@16: 
Chris@16: #if defined(BOOST_MSVC)
Chris@16: #pragma warning(pop) // #pragma warning(disable:4251)
Chris@16: #endif
Chris@16: 
Chris@16: #endif      // #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED