1 #ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED

     2 #define BOOST_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 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 #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)

    20 #include <boost/detail/shared_array_nmt.hpp>

    21 #else

    22 

    23 #include <memory>             // TR1 cyclic inclusion fix

    24 

    25 #include <boost/assert.hpp>

    26 #include <boost/checked_delete.hpp>

    27 

    28 #include <boost/detail/shared_count.hpp>

    29 #include <boost/detail/workaround.hpp>

    30 

    31 #include <cstddef>            // for std::ptrdiff_t

    32 #include <algorithm>          // for std::swap

    33 #include <functional>         // for std::less

    34 

    35 namespace boost

    36 {

    37 

    38 //

    39 //  shared_array

    40 //

    41 //  shared_array extends shared_ptr to arrays.

    42 //  The array pointed to is deleted when the last shared_array pointing to it

    43 //  is destroyed or reset.

    44 //

    45 

    46 template<class T> class shared_array

    47 {

    48 private:

    49 

    50     // Borland 5.5.1 specific workarounds

    51     typedef checked_array_deleter<T> deleter;

    52     typedef shared_array<T> this_type;

    53 

    54 public:

    55 

    56     typedef T element_type;

    57 

    58     explicit shared_array(T * p = 0): px(p), pn(p, deleter())

    59     {

    60     }

    61 

    62     //

    63     // Requirements: D's copy constructor must not throw

    64     //

    65     // shared_array will release p by calling d(p)

    66     //

    67 

    68     template<class D> shared_array(T * p, D d): px(p), pn(p, d)

    69     {

    70     }

    71 

    72 //  generated copy constructor, assignment, destructor are fine

    73 

    74     void reset(T * p = 0)

    75     {

    76         BOOST_ASSERT(p == 0 || p != px);

    77         this_type(p).swap(*this);

    78     }

    79 

    80     template <class D> void reset(T * p, D d)

    81     {

    82         this_type(p, d).swap(*this);

    83     }

    84 

    85     T & operator[] (std::ptrdiff_t i) const // never throws

    86     {

    87         BOOST_ASSERT(px != 0);

    88         BOOST_ASSERT(i >= 0);

    89         return px[i];

    90     }

    91     

    92     T * get() const // never throws

    93     {

    94         return px;

    95     }

    96 

    97     // implicit conversion to "bool"

    98 

    99 #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)

   100 

   101     operator bool () const

   102     {

   103         return px != 0;

   104     }

   105 

   106 #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))

   107     typedef T * (this_type::*unspecified_bool_type)() const;

   108     

   109     operator unspecified_bool_type() const // never throws

   110     {

   111         return px == 0? 0: &this_type::get;

   112     }

   113 

   114 #else 

   115 

   116     typedef T * this_type::*unspecified_bool_type;

   117 

   118     operator unspecified_bool_type() const // never throws

   119     {

   120         return px == 0? 0: &this_type::px;

   121     }

   122 

   123 #endif

   124 

   125     bool operator! () const // never throws

   126     {

   127         return px == 0;

   128     }

   129 

   130     bool unique() const // never throws

   131     {

   132         return pn.unique();

   133     }

   134 

   135     long use_count() const // never throws

   136     {

   137         return pn.use_count();

   138     }

   139 

   140     void swap(shared_array<T> & other) // never throws

   141     {

   142         std::swap(px, other.px);

   143         pn.swap(other.pn);

   144     }

   145 

   146 private:

   147 

   148     T * px;                     // contained pointer

   149     detail::shared_count pn;    // reference counter

   150 

   151 };  // shared_array

   152 

   153 template<class T> inline bool operator==(shared_array<T> const & a, shared_array<T> const & b) // never throws

   154 {

   155     return a.get() == b.get();

   156 }

   157 

   158 template<class T> inline bool operator!=(shared_array<T> const & a, shared_array<T> const & b) // never throws

   159 {

   160     return a.get() != b.get();

   161 }

   162 

   163 template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) // never throws

   164 {

   165     return std::less<T*>()(a.get(), b.get());

   166 }

   167 

   168 template<class T> void swap(shared_array<T> & a, shared_array<T> & b) // never throws

   169 {

   170     a.swap(b);

   171 }

   172 

   173 } // namespace boost

   174 

   175 #endif  // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)

   176 

   177 #endif  // #ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED