ceph/src/boost/libs/smart_ptr/include/boost/smart_ptr/shared_array.hpp

   1 #ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
   3
   4 //
   5 //  shared_array.hpp
   6 //
   7 //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
   8 //  Copyright (c) 2001, 2002, 2012 Peter Dimov
   9 //
  10 //  Distributed under the Boost Software License, Version 1.0. (See
  11 //  accompanying file LICENSE_1_0.txt or copy at
  12 //  http://www.boost.org/LICENSE_1_0.txt)
  13 //
  14 //  See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation.
  15 //
  16
  17 #include <boost/config.hpp>   // for broken compiler workarounds
  18
  19 #include <memory>             // TR1 cyclic inclusion fix
  20
  21 #include <boost/assert.hpp>
  22 #include <boost/checked_delete.hpp>
  23
  24 #include <boost/smart_ptr/shared_ptr.hpp>
  25 #include <boost/smart_ptr/detail/shared_count.hpp>
  26 #include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
  27 #include <boost/detail/workaround.hpp>
  28
  29 #include <cstddef>            // for std::ptrdiff_t
  30 #include <algorithm>          // for std::swap
  31 #include <functional>         // for std::less
  32
  33 namespace boost
  34 {
  35
  36 //
  37 //  shared_array
  38 //
  39 //  shared_array extends shared_ptr to arrays.
  40 //  The array pointed to is deleted when the last shared_array pointing to it
  41 //  is destroyed or reset.
  42 //
  43
  44 template<class T> class shared_array
  45 {
  46 private:
  47
  48     // Borland 5.5.1 specific workarounds
  49     typedef checked_array_deleter<T> deleter;
  50     typedef shared_array<T> this_type;
  51
  52 public:
  53
  54     typedef T element_type;
  55
  56     shared_array() BOOST_NOEXCEPT : px( 0 ), pn()
  57     {
  58     }
  59
  60 #if !defined( BOOST_NO_CXX11_NULLPTR )
  61
  62     shared_array( boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT : px( 0 ), pn()
  63     {
  64     }
  65
  66 #endif
  67
  68     template<class Y>
  69     explicit shared_array( Y * p ): px( p ), pn( p, checked_array_deleter<Y>() )
  70     {
  71         boost::detail::sp_assert_convertible< Y[], T[] >();
  72     }
  73
  74     //
  75     // Requirements: D's copy constructor must not throw
  76     //
  77     // shared_array will release p by calling d(p)
  78     //
  79
  80     template<class Y, class D> shared_array( Y * p, D d ): px( p ), pn( p, d )
  81     {
  82         boost::detail::sp_assert_convertible< Y[], T[] >();
  83     }
  84
  85     // As above, but with allocator. A's copy constructor shall not throw.
  86
  87     template<class Y, class D, class A> shared_array( Y * p, D d, A a ): px( p ), pn( p, d, a )
  88     {
  89         boost::detail::sp_assert_convertible< Y[], T[] >();
  90     }
  91
  92 //  generated copy constructor, destructor are fine...
  93
  94 #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
  95
  96 // ... except in C++0x, move disables the implicit copy
  97
  98     shared_array( shared_array const & r ) BOOST_NOEXCEPT : px( r.px ), pn( r.pn )
  99     {
 100     }
 101
 102     shared_array( shared_array && r ) BOOST_NOEXCEPT : px( r.px ), pn()
 103     {
 104         pn.swap( r.pn );
 105         r.px = 0;
 106     }
 107
 108 #endif
 109
 110     // conversion
 111
 112     template<class Y>
 113 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
 114
 115     shared_array( shared_array<Y> const & r, typename boost::detail::sp_enable_if_convertible< Y[], T[] >::type = boost::detail::sp_empty() )
 116
 117 #else
 118
 119     shared_array( shared_array<Y> const & r )
 120
 121 #endif
 122     BOOST_NOEXCEPT : px( r.px ), pn( r.pn ) // never throws
 123     {
 124         boost::detail::sp_assert_convertible< Y[], T[] >();
 125     }
 126
 127     // aliasing
 128
 129     template< class Y >
 130     shared_array( shared_array<Y> const & r, element_type * p ) BOOST_NOEXCEPT : px( p ), pn( r.pn )
 131     {
 132     }
 133
 134     // assignment
 135
 136     shared_array & operator=( shared_array const & r ) BOOST_NOEXCEPT
 137     {
 138         this_type( r ).swap( *this );
 139         return *this;
 140     }
 141
 142 #if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)
 143
 144     template<class Y>
 145     shared_array & operator=( shared_array<Y> const & r ) BOOST_NOEXCEPT
 146     {
 147         this_type( r ).swap( *this );
 148         return *this;
 149     }
 150
 151 #endif
 152
 153 #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
 154
 155     shared_array & operator=( shared_array && r ) BOOST_NOEXCEPT
 156     {
 157         this_type( static_cast< shared_array && >( r ) ).swap( *this );
 158         return *this;
 159     }
 160
 161     template<class Y>
 162     shared_array & operator=( shared_array<Y> && r ) BOOST_NOEXCEPT
 163     {
 164         this_type( static_cast< shared_array<Y> && >( r ) ).swap( *this );
 165         return *this;
 166     }
 167
 168 #endif
 169
 170     void reset() BOOST_NOEXCEPT
 171     {
 172         this_type().swap( *this );
 173     }
 174
 175     template<class Y> void reset( Y * p ) // Y must be complete
 176     {
 177         BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
 178         this_type( p ).swap( *this );
 179     }
 180
 181     template<class Y, class D> void reset( Y * p, D d )
 182     {
 183         this_type( p, d ).swap( *this );
 184     }
 185
 186     template<class Y, class D, class A> void reset( Y * p, D d, A a )
 187     {
 188         this_type( p, d, a ).swap( *this );
 189     }
 190
 191     template<class Y> void reset( shared_array<Y> const & r, element_type * p )
 192     {
 193         this_type( r, p ).swap( *this );
 194     }
 195
 196     T & operator[] (std::ptrdiff_t i) const // never throws (but has a BOOST_ASSERT in it, so not marked with BOOST_NOEXCEPT)
 197     {
 198         BOOST_ASSERT(px != 0);
 199         BOOST_ASSERT(i >= 0);
 200         return px[i];
 201     }
 202
 203     T * get() const BOOST_NOEXCEPT
 204     {
 205         return px;
 206     }
 207
 208 // implicit conversion to "bool"
 209 #include <boost/smart_ptr/detail/operator_bool.hpp>
 210
 211     bool unique() const BOOST_NOEXCEPT
 212     {
 213         return pn.unique();
 214     }
 215
 216     long use_count() const BOOST_NOEXCEPT
 217     {
 218         return pn.use_count();
 219     }
 220
 221     void swap(shared_array<T> & other) BOOST_NOEXCEPT
 222     {
 223         std::swap(px, other.px);
 224         pn.swap(other.pn);
 225     }
 226
 227     void * _internal_get_deleter( boost::detail::sp_typeinfo const & ti ) const
 228     {
 229         return pn.get_deleter( ti );
 230     }
 231
 232 private:
 233
 234     template<class Y> friend class shared_array;
 235
 236     T * px;                     // contained pointer
 237     detail::shared_count pn;    // reference counter
 238
 239 };  // shared_array
 240
 241 template<class T> inline bool operator==(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
 242 {
 243     return a.get() == b.get();
 244 }
 245
 246 template<class T> inline bool operator!=(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
 247 {
 248     return a.get() != b.get();
 249 }
 250
 251 #if !defined( BOOST_NO_CXX11_NULLPTR )
 252
 253 template<class T> inline bool operator==( shared_array<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
 254 {
 255     return p.get() == 0;
 256 }
 257
 258 template<class T> inline bool operator==( boost::detail::sp_nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
 259 {
 260     return p.get() == 0;
 261 }
 262
 263 template<class T> inline bool operator!=( shared_array<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
 264 {
 265     return p.get() != 0;
 266 }
 267
 268 template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
 269 {
 270     return p.get() != 0;
 271 }
 272
 273 #endif
 274
 275 template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
 276 {
 277     return std::less<T*>()(a.get(), b.get());
 278 }
 279
 280 template<class T> void swap(shared_array<T> & a, shared_array<T> & b) BOOST_NOEXCEPT
 281 {
 282     a.swap(b);
 283 }
 284
 285 template< class D, class T > D * get_deleter( shared_array<T> const & p )
 286 {
 287     return static_cast< D * >( p._internal_get_deleter( BOOST_SP_TYPEID(D) ) );
 288 }
 289
 290 } // namespace boost
 291
 292 #endif  // #ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED