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