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

source code of boost/libs/ptr_container/include/boost/ptr_container/detail/static_move_ptr.hpp