// (C) Copyright Thorsten Ottosen 2005.

 // (C) Copyright Jonathan Turkanis 2004.

 // (C) Copyright Daniel Wallin 2004.

 // Distributed under 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.)

 // Implementation of the move_ptr from the "Move Proposal" 

 // (http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1377.htm) 

 // enhanced to support custom deleters and safe boolean conversions.

 //

 // The implementation is based on an implementation by Daniel Wallin, at

 // "http://aspn.activestate.com/ASPN/Mail/Message/Attachments/boost/

 // 400DC271.1060903@student.umu.se/move_ptr.hpp". The current was adapted 

 // by Jonathan Turkanis to incorporating ideas of Howard Hinnant and 

 // Rani Sharoni. 

 #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED

 #define BOOST_STATIC_MOVE_PTR_HPP_INCLUDED

 #include <boost/config.hpp> // Member template friends, put size_t in std.

 #include <algorithm>        // swap.

 #include <cstddef>          // size_t

 #include <boost/compressed_pair.hpp> 

 #include <boost/ptr_container/detail/default_deleter.hpp>       

 #include <boost/ptr_container/detail/is_convertible.hpp>       

 #include <boost/ptr_container/detail/move.hpp>       

 #include <boost/static_assert.hpp>

 #include <boost/type_traits/add_reference.hpp>

 #include <boost/type_traits/is_array.hpp>

 #if defined(BOOST_MSVC)

 #pragma warning(push)

 #pragma warning(disable:4521)        // Multiple copy constuctors.

 #endif

 namespace boost { namespace ptr_container_detail {

 template< typename T, 

           typename Deleter = 

               move_ptrs::default_deleter<T> >

 class static_move_ptr 

 {

 public:

     typedef typename remove_bounds<T>::type             element_type;

     typedef Deleter                                     deleter_type;

 private:

     struct safe_bool_helper { int x; };

     typedef int safe_bool_helper::* safe_bool;

     typedef boost::compressed_pair<element_type*, Deleter> impl_type;

 public:

     typedef typename impl_type::second_reference        deleter_reference;

     typedef typename impl_type::second_const_reference  deleter_const_reference;

         // Constructors

     static_move_ptr() : impl_(0) { }

     static_move_ptr(const static_move_ptr& p)

         : impl_(p.get(), p.get_deleter())    

         { 

             const_cast<static_move_ptr&>(p).release();

         }

 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))    

     static_move_ptr( const move_ptrs::move_source<static_move_ptr<T,Deleter> >& src )

 #else

     static_move_ptr( const move_ptrs::move_source<static_move_ptr>& src )

 #endif    

             : impl_(src.ptr().get(), src.ptr().get_deleter())

             {

                 src.ptr().release();

             }

     template<typename TT>

     explicit static_move_ptr(TT* tt) 

         : impl_(tt, Deleter()) 

         { }

         // Destructor

     ~static_move_ptr() { if (ptr()) get_deleter()(ptr()); }

         // Assignment

     static_move_ptr& operator=(static_move_ptr rhs)

         {

             rhs.swap(*this);

             return *this;

         }

         // Smart pointer interface

     element_type* get() const { return ptr(); }

     element_type& operator*() 

         { 

             /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); 

         }

     const element_type& operator*() const 

         { 

             /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); 

         }

     element_type* operator->()  

         { 

             /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); 

         }    

     const element_type* operator->() const 

         { 

             /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); 

         }    

     element_type* release()

         {

             element_type* result = ptr();

             ptr() = 0;

             return result;

         }

     void reset()

         {

             if (ptr()) get_deleter()(ptr());

             ptr() = 0;

         }

     template<typename TT>

     void reset(TT* tt) 

         {

             static_move_ptr(tt).swap(*this);

         }

     template<typename TT, typename DD>

     void reset(TT* tt, DD dd) 

         {

             static_move_ptr(tt, dd).swap(*this);

         }

     operator safe_bool() const { return ptr() ? &safe_bool_helper::x : 0; }

     void swap(static_move_ptr& p) { impl_.swap(p.impl_); }

     deleter_reference get_deleter() { return impl_.second(); }

     deleter_const_reference get_deleter() const { return impl_.second(); }

 private:

     template<typename TT, typename DD>

     void check(const static_move_ptr<TT, DD>& ptr)

         {

             typedef move_ptrs::is_smart_ptr_convertible<TT, T> convertible;

             BOOST_STATIC_ASSERT(convertible::value);

         }   

 #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) || defined(BOOST_NO_SFINAE)

 // give up on this behavior

 #else 

     template<typename Ptr> struct cant_move_from_const;

     template<typename TT, typename DD> 

     struct cant_move_from_const< const static_move_ptr<TT, DD> > { 

         typedef typename static_move_ptr<TT, DD>::error type; 

     };

     template<typename Ptr> 

     static_move_ptr(Ptr&, typename cant_move_from_const<Ptr>::type = 0);

 public:

     static_move_ptr(static_move_ptr&);

 private:

     template<typename TT, typename DD>

     static_move_ptr( static_move_ptr<TT, DD>&,

                      typename 

                      move_ptrs::enable_if_convertible<

                          TT, T, static_move_ptr&

                      >::type::type* = 0 );

 #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING || BOOST_NO_SFINAE

 //#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS

 //    template<typename TT, typename DD>

 //    friend class static_move_ptr;

 //#else

     public:

 //#endif

     typename impl_type::first_reference 

     ptr() { return impl_.first(); } 

     typename impl_type::first_const_reference 

     ptr() const { return impl_.first(); }

     impl_type impl_;

 };

 } // namespace ptr_container_detail

 } // End namespace boost.

 #if defined(BOOST_MSVC)

 #pragma warning(pop) // #pragma warning(disable:4251)

 #endif

 #endif      // #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED