[857] | 1 | // (C) Copyright Thorsten Ottosen 2005.
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| 2 | // (C) Copyright Jonathan Turkanis 2004.
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| 3 | // (C) Copyright Daniel Wallin 2004.
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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| 6 |
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| 7 | // Implementation of the move_ptr from the "Move Proposal"
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| 8 | // (http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1377.htm)
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| 9 | // enhanced to support custom deleters and safe boolean conversions.
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| 10 | //
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| 11 | // The implementation is based on an implementation by Daniel Wallin, at
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| 12 | // "http://aspn.activestate.com/ASPN/Mail/Message/Attachments/boost/
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| 13 | // 400DC271.1060903@student.umu.se/move_ptr.hpp". The current was adapted
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| 14 | // by Jonathan Turkanis to incorporating ideas of Howard Hinnant and
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| 15 | // Rani Sharoni.
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| 16 |
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| 17 | #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
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| 18 | #define BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
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| 19 |
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| 20 | #include <boost/config.hpp> // Member template friends, put size_t in std.
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| 21 | #include <algorithm> // swap.
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| 22 | #include <cstddef> // size_t
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| 23 | #include <boost/compressed_pair.hpp>
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| 24 | #include <boost/ptr_container/detail/default_deleter.hpp>
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| 25 | #include <boost/ptr_container/detail/is_convertible.hpp>
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| 26 | #include <boost/ptr_container/detail/move.hpp>
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| 27 | #include <boost/static_assert.hpp>
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| 28 | #include <boost/type_traits/add_reference.hpp>
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| 29 | #include <boost/type_traits/is_array.hpp>
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| 30 |
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| 31 | #if defined(BOOST_MSVC)
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| 32 | #pragma warning(push)
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| 33 | #pragma warning(disable:4521) // Multiple copy constuctors.
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| 34 | #endif
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| 35 |
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| 36 | namespace boost { namespace ptr_container_detail {
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| 37 |
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| 38 |
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| 39 | template< typename T,
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| 40 | typename Deleter =
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| 41 | move_ptrs::default_deleter<T> >
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| 42 | class static_move_ptr
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| 43 | {
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| 44 | public:
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| 45 |
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| 46 | typedef typename remove_bounds<T>::type element_type;
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| 47 | typedef Deleter deleter_type;
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| 48 |
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| 49 | private:
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| 50 |
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| 51 | struct safe_bool_helper { int x; };
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| 52 | typedef int safe_bool_helper::* safe_bool;
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| 53 | typedef boost::compressed_pair<element_type*, Deleter> impl_type;
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| 54 |
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| 55 | public:
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| 56 | typedef typename impl_type::second_reference deleter_reference;
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| 57 | typedef typename impl_type::second_const_reference deleter_const_reference;
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| 58 |
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| 59 | // Constructors
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| 60 |
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| 61 | static_move_ptr() : impl_(0) { }
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| 62 |
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| 63 | static_move_ptr(const static_move_ptr& p)
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| 64 | : impl_(p.get(), p.get_deleter())
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| 65 | {
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| 66 | const_cast<static_move_ptr&>(p).release();
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| 67 | }
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| 68 |
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| 69 | #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
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| 70 | static_move_ptr( const move_ptrs::move_source<static_move_ptr<T,Deleter> >& src )
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| 71 | #else
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| 72 | static_move_ptr( const move_ptrs::move_source<static_move_ptr>& src )
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| 73 | #endif
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| 74 | : impl_(src.ptr().get(), src.ptr().get_deleter())
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| 75 | {
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| 76 | src.ptr().release();
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| 77 | }
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| 78 |
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| 79 | template<typename TT>
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| 80 | explicit static_move_ptr(TT* tt)
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| 81 | : impl_(tt, Deleter())
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| 82 | { }
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| 83 |
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| 84 | // Destructor
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| 85 |
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| 86 | ~static_move_ptr() { if (ptr()) get_deleter()(ptr()); }
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| 87 |
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| 88 | // Assignment
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| 89 |
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| 90 | static_move_ptr& operator=(static_move_ptr rhs)
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| 91 | {
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| 92 | rhs.swap(*this);
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| 93 | return *this;
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| 94 | }
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| 95 |
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| 96 | // Smart pointer interface
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| 97 |
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| 98 | element_type* get() const { return ptr(); }
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| 99 |
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| 100 | element_type& operator*()
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| 101 | {
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| 102 | /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr();
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| 103 | }
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| 104 |
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| 105 | const element_type& operator*() const
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| 106 | {
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| 107 | /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr();
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| 108 | }
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| 109 |
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| 110 | element_type* operator->()
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| 111 | {
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| 112 | /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr();
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| 113 | }
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| 114 |
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| 115 | const element_type* operator->() const
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| 116 | {
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| 117 | /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr();
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| 118 | }
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| 119 |
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| 120 |
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| 121 | element_type* release()
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| 122 | {
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| 123 | element_type* result = ptr();
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| 124 | ptr() = 0;
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| 125 | return result;
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| 126 | }
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| 127 |
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| 128 | void reset()
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| 129 | {
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| 130 | if (ptr()) get_deleter()(ptr());
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| 131 | ptr() = 0;
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| 132 | }
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| 133 |
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| 134 | template<typename TT>
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| 135 | void reset(TT* tt)
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| 136 | {
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| 137 | static_move_ptr(tt).swap(*this);
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| 138 | }
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| 139 |
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| 140 | template<typename TT, typename DD>
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| 141 | void reset(TT* tt, DD dd)
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| 142 | {
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| 143 | static_move_ptr(tt, dd).swap(*this);
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| 144 | }
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| 145 |
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| 146 | operator safe_bool() const { return ptr() ? &safe_bool_helper::x : 0; }
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| 147 |
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| 148 | void swap(static_move_ptr& p) { impl_.swap(p.impl_); }
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| 149 |
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| 150 | deleter_reference get_deleter() { return impl_.second(); }
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| 151 |
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| 152 | deleter_const_reference get_deleter() const { return impl_.second(); }
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| 153 | private:
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| 154 | template<typename TT, typename DD>
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| 155 | void check(const static_move_ptr<TT, DD>& ptr)
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| 156 | {
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| 157 | typedef move_ptrs::is_smart_ptr_convertible<TT, T> convertible;
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| 158 | BOOST_STATIC_ASSERT(convertible::value);
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| 159 | }
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| 160 |
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| 161 | #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) || defined(BOOST_NO_SFINAE)
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| 162 | // give up on this behavior
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| 163 | #else
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| 164 |
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| 165 | template<typename Ptr> struct cant_move_from_const;
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| 166 |
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| 167 | template<typename TT, typename DD>
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| 168 | struct cant_move_from_const< const static_move_ptr<TT, DD> > {
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| 169 | typedef typename static_move_ptr<TT, DD>::error type;
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| 170 | };
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| 171 |
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| 172 | template<typename Ptr>
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| 173 | static_move_ptr(Ptr&, typename cant_move_from_const<Ptr>::type = 0);
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| 174 |
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| 175 |
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| 176 | public:
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| 177 | static_move_ptr(static_move_ptr&);
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| 178 |
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| 179 |
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| 180 | private:
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| 181 | template<typename TT, typename DD>
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| 182 | static_move_ptr( static_move_ptr<TT, DD>&,
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| 183 | typename
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| 184 | move_ptrs::enable_if_convertible<
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| 185 | TT, T, static_move_ptr&
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| 186 | >::type::type* = 0 );
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| 187 |
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| 188 | #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING || BOOST_NO_SFINAE
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| 189 |
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| 190 | //#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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| 191 | // template<typename TT, typename DD>
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| 192 | // friend class static_move_ptr;
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| 193 | //#else
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| 194 | public:
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| 195 | //#endif
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| 196 | typename impl_type::first_reference
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| 197 | ptr() { return impl_.first(); }
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| 198 |
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| 199 | typename impl_type::first_const_reference
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| 200 | ptr() const { return impl_.first(); }
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| 201 |
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| 202 | impl_type impl_;
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| 203 | };
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| 204 |
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| 205 | } // namespace ptr_container_detail
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| 206 | } // End namespace boost.
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| 207 |
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| 208 | #if defined(BOOST_MSVC)
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| 209 | #pragma warning(pop) // #pragma warning(disable:4251)
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| 210 | #endif
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| 211 |
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| 212 | #endif // #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED
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