williamr@2: // (C) Copyright Thorsten Ottosen 2005.
williamr@2: // (C) Copyright Jonathan Turkanis 2004.
williamr@2: // (C) Copyright Daniel Wallin 2004.
williamr@2: // Distributed under the Boost Software License, Version 1.0. (See accompanying
williamr@2: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
williamr@2: 
williamr@2: // Implementation of the move_ptr from the "Move Proposal" 
williamr@2: // (http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1377.htm) 
williamr@2: // enhanced to support custom deleters and safe boolean conversions.
williamr@2: //
williamr@2: // The implementation is based on an implementation by Daniel Wallin, at
williamr@2: // "http://aspn.activestate.com/ASPN/Mail/Message/Attachments/boost/
williamr@2: // 400DC271.1060903@student.umu.se/move_ptr.hpp". The current was adapted 
williamr@2: // by Jonathan Turkanis to incorporating ideas of Howard Hinnant and 
williamr@2: // Rani Sharoni. 
williamr@2: 
williamr@2: #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
williamr@2: #define BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
williamr@2: 
williamr@2: #include <boost/config.hpp> // Member template friends, put size_t in std.
williamr@2: #include <algorithm>        // swap.
williamr@2: #include <cstddef>          // size_t
williamr@2: #include <boost/compressed_pair.hpp> 
williamr@2: #include <boost/ptr_container/detail/default_deleter.hpp>       
williamr@2: #include <boost/ptr_container/detail/is_convertible.hpp>       
williamr@2: #include <boost/ptr_container/detail/move.hpp>       
williamr@2: #include <boost/static_assert.hpp>
williamr@2: #include <boost/type_traits/add_reference.hpp>
williamr@2: #include <boost/type_traits/is_array.hpp>
williamr@2: 
williamr@2: #if defined(BOOST_MSVC)
williamr@2: #pragma warning(push)
williamr@2: #pragma warning(disable:4521)        // Multiple copy constuctors.
williamr@2: #endif
williamr@2: 
williamr@2: namespace boost { namespace ptr_container_detail {
williamr@2: 
williamr@2:     
williamr@2: template< typename T, 
williamr@2:           typename Deleter = 
williamr@2:               move_ptrs::default_deleter<T> >
williamr@2: class static_move_ptr 
williamr@2: {
williamr@2: public:
williamr@2: 
williamr@2:     typedef typename remove_bounds<T>::type             element_type;
williamr@2:     typedef Deleter                                     deleter_type;
williamr@2: 
williamr@2: private:
williamr@2:     
williamr@2:     struct safe_bool_helper { int x; };
williamr@2:     typedef int safe_bool_helper::* safe_bool;
williamr@2:     typedef boost::compressed_pair<element_type*, Deleter> impl_type;
williamr@2: 
williamr@2: public:
williamr@2:     typedef typename impl_type::second_reference        deleter_reference;
williamr@2:     typedef typename impl_type::second_const_reference  deleter_const_reference;
williamr@2: 
williamr@2:         // Constructors
williamr@2: 
williamr@2:     static_move_ptr() : impl_(0) { }
williamr@2: 
williamr@2:     static_move_ptr(const static_move_ptr& p)
williamr@2:         : impl_(p.get(), p.get_deleter())    
williamr@2:         { 
williamr@2:             const_cast<static_move_ptr&>(p).release();
williamr@2:         }
williamr@2: 
williamr@2: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))    
williamr@2:     static_move_ptr( const move_ptrs::move_source<static_move_ptr<T,Deleter> >& src )
williamr@2: #else
williamr@2:     static_move_ptr( const move_ptrs::move_source<static_move_ptr>& src )
williamr@2: #endif    
williamr@2:             : impl_(src.ptr().get(), src.ptr().get_deleter())
williamr@2:             {
williamr@2:                 src.ptr().release();
williamr@2:             }
williamr@2:     
williamr@2:     template<typename TT>
williamr@2:     explicit static_move_ptr(TT* tt) 
williamr@2:         : impl_(tt, Deleter()) 
williamr@2:         { }
williamr@2: 
williamr@2:         // Destructor
williamr@2: 
williamr@2:     ~static_move_ptr() { if (ptr()) get_deleter()(ptr()); }
williamr@2: 
williamr@2:         // Assignment
williamr@2: 
williamr@2:     static_move_ptr& operator=(static_move_ptr rhs)
williamr@2:         {
williamr@2:             rhs.swap(*this);
williamr@2:             return *this;
williamr@2:         }
williamr@2: 
williamr@2:         // Smart pointer interface
williamr@2: 
williamr@2:     element_type* get() const { return ptr(); }
williamr@2: 
williamr@2:     element_type& operator*() 
williamr@2:         { 
williamr@2:             /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); 
williamr@2:         }
williamr@2: 
williamr@2:     const element_type& operator*() const 
williamr@2:         { 
williamr@2:             /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); 
williamr@2:         }
williamr@2: 
williamr@2:     element_type* operator->()  
williamr@2:         { 
williamr@2:             /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); 
williamr@2:         }    
williamr@2: 
williamr@2:     const element_type* operator->() const 
williamr@2:         { 
williamr@2:             /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); 
williamr@2:         }    
williamr@2: 
williamr@2: 
williamr@2:     element_type* release()
williamr@2:         {
williamr@2:             element_type* result = ptr();
williamr@2:             ptr() = 0;
williamr@2:             return result;
williamr@2:         }
williamr@2: 
williamr@2:     void reset()
williamr@2:         {
williamr@2:             if (ptr()) get_deleter()(ptr());
williamr@2:             ptr() = 0;
williamr@2:         }
williamr@2: 
williamr@2:     template<typename TT>
williamr@2:     void reset(TT* tt) 
williamr@2:         {
williamr@2:             static_move_ptr(tt).swap(*this);
williamr@2:         }
williamr@2: 
williamr@2:     template<typename TT, typename DD>
williamr@2:     void reset(TT* tt, DD dd) 
williamr@2:         {
williamr@2:             static_move_ptr(tt, dd).swap(*this);
williamr@2:         }
williamr@2: 
williamr@2:     operator safe_bool() const { return ptr() ? &safe_bool_helper::x : 0; }
williamr@2: 
williamr@2:     void swap(static_move_ptr& p) { impl_.swap(p.impl_); }
williamr@2: 
williamr@2:     deleter_reference get_deleter() { return impl_.second(); }
williamr@2: 
williamr@2:     deleter_const_reference get_deleter() const { return impl_.second(); }
williamr@2: private:
williamr@2:     template<typename TT, typename DD>
williamr@2:     void check(const static_move_ptr<TT, DD>& ptr)
williamr@2:         {
williamr@2:             typedef move_ptrs::is_smart_ptr_convertible<TT, T> convertible;
williamr@2:             BOOST_STATIC_ASSERT(convertible::value);
williamr@2:         }   
williamr@2: 
williamr@2: #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) || defined(BOOST_NO_SFINAE)
williamr@2: // give up on this behavior
williamr@2: #else 
williamr@2: 
williamr@2:     template<typename Ptr> struct cant_move_from_const;
williamr@2: 
williamr@2:     template<typename TT, typename DD> 
williamr@2:     struct cant_move_from_const< const static_move_ptr<TT, DD> > { 
williamr@2:         typedef typename static_move_ptr<TT, DD>::error type; 
williamr@2:     };
williamr@2: 
williamr@2:     template<typename Ptr> 
williamr@2:     static_move_ptr(Ptr&, typename cant_move_from_const<Ptr>::type = 0);
williamr@2: 
williamr@2: 
williamr@2: public:
williamr@2:     static_move_ptr(static_move_ptr&);
williamr@2: 
williamr@2:     
williamr@2: private:
williamr@2:     template<typename TT, typename DD>
williamr@2:     static_move_ptr( static_move_ptr<TT, DD>&,
williamr@2:                      typename 
williamr@2:                      move_ptrs::enable_if_convertible<
williamr@2:                          TT, T, static_move_ptr&
williamr@2:                      >::type::type* = 0 );
williamr@2: 
williamr@2: #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING || BOOST_NO_SFINAE
williamr@2: 
williamr@2: //#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
williamr@2: //    template<typename TT, typename DD>
williamr@2: //    friend class static_move_ptr;
williamr@2: //#else
williamr@2:     public:
williamr@2: //#endif
williamr@2:     typename impl_type::first_reference 
williamr@2:     ptr() { return impl_.first(); } 
williamr@2: 
williamr@2:     typename impl_type::first_const_reference 
williamr@2:     ptr() const { return impl_.first(); }
williamr@2: 
williamr@2:     impl_type impl_;
williamr@2: };
williamr@2: 
williamr@2: } // namespace ptr_container_detail
williamr@2: } // End namespace boost.
williamr@2: 
williamr@2: #if defined(BOOST_MSVC)
williamr@2: #pragma warning(pop) // #pragma warning(disable:4251)
williamr@2: #endif
williamr@2: 
williamr@2: #endif      // #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED