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 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/smart_ptr/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/smart_ptr/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 #include <boost/smart_ptr/detail/operator_bool.hpp>

    99 

   100     bool unique() const // never throws

   101     {

   102         return pn.unique();

   103     }

   104 

   105     long use_count() const // never throws

   106     {

   107         return pn.use_count();

   108     }

   109 

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

   111     {

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

   113         pn.swap(other.pn);

   114     }

   115 

   116 private:

   117 

   118     T * px;                     // contained pointer

   119     detail::shared_count pn;    // reference counter

   120 

   121 };  // shared_array

   122 

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

   124 {

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

   126 }

   127 

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

   129 {

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

   131 }

   132 

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

   134 {

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

   136 }

   137 

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

   139 {

   140     a.swap(b);

   141 }

   142 

   143 } // namespace boost

   144 

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

   146 

   147 #endif  // #ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED