ceph/src/boost/libs/ptr_container/include/boost/ptr_container/detail/static_move_ptr.hpp

   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
  35 namespace boost { namespace ptr_container_detail {
  36
  37
  38 template< typename T,
  39           typename Deleter =
  40               move_ptrs::default_deleter<T> >
  41 class static_move_ptr
  42 {
  43 public:
  44
  45     typedef typename remove_bounds<T>::type             element_type;
  46     typedef Deleter                                     deleter_type;
  47
  48 private:
  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
  54 public:
  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(__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     explicit static_move_ptr(TT* tt)
  80         : impl_(tt, Deleter())
  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(*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)
 135         {
 136             static_move_ptr(tt).swap(*this);
 137         }
 138
 139     template<typename TT, typename DD>
 140     void reset(TT* tt, DD dd)
 141         {
 142             static_move_ptr(tt, dd).swap(*this);
 143         }
 144
 145     operator safe_bool() const { return ptr() ? &safe_bool_helper::x : 0; }
 146
 147     void swap(static_move_ptr& p) { impl_.swap(p.impl_); }
 148
 149     deleter_reference get_deleter() { return impl_.second(); }
 150
 151     deleter_const_reference get_deleter() const { return impl_.second(); }
 152 private:
 153     template<typename TT, typename DD>
 154     void check(const static_move_ptr<TT, DD>& ptr)
 155         {
 156             typedef move_ptrs::is_smart_ptr_convertible<TT, T> convertible;
 157             BOOST_STATIC_ASSERT(convertible::value);
 158         }
 159
 160 #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) || defined(BOOST_NO_SFINAE)
 161 // give up on this behavior
 162 #else
 163
 164     template<typename Ptr> struct cant_move_from_const;
 165
 166     template<typename TT, typename DD>
 167     struct cant_move_from_const< const static_move_ptr<TT, DD> > {
 168         typedef typename static_move_ptr<TT, DD>::error type;
 169     };
 170
 171     template<typename Ptr>
 172     static_move_ptr(Ptr&, typename cant_move_from_const<Ptr>::type = 0);
 173
 174
 175 public:
 176     static_move_ptr(static_move_ptr&);
 177
 178
 179 private:
 180     template<typename TT, typename DD>
 181     static_move_ptr( static_move_ptr<TT, DD>&,
 182                      typename
 183                      move_ptrs::enable_if_convertible<
 184                          TT, T, static_move_ptr&
 185                      >::type::type* = 0 );
 186
 187 #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING || BOOST_NO_SFINAE
 188
 189 //#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
 190 //    template<typename TT, typename DD>
 191 //    friend class static_move_ptr;
 192 //#else
 193     public:
 194 //#endif
 195     typename impl_type::first_reference
 196     ptr() { return impl_.first(); }
 197
 198     typename impl_type::first_const_reference
 199     ptr() const { return impl_.first(); }
 200
 201     impl_type impl_;
 202 };
 203
 204 } // namespace ptr_container_detail
 205 } // End namespace boost.
 206
 207 #if defined(BOOST_MSVC)
 208 #pragma warning(pop) // #pragma warning(disable:4251)
 209 #endif
 210
 211 #endif      // #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED