#ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED

 #define BOOST_SHARED_ARRAY_HPP_INCLUDED

 //

 //  shared_array.hpp

 //

 //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.

 //  Copyright (c) 2001, 2002 Peter Dimov

 //

 //  Distributed under the Boost Software License, Version 1.0. (See

 //  accompanying file LICENSE_1_0.txt or copy at

 //  http://www.boost.org/LICENSE_1_0.txt)

 //

 //  See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation.

 //

 #include <boost/config.hpp>   // for broken compiler workarounds

 #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)

 #include <boost/detail/shared_array_nmt.hpp>

 #else

 #include <memory>             // TR1 cyclic inclusion fix

 #include <boost/assert.hpp>

 #include <boost/checked_delete.hpp>

 #include <boost/detail/shared_count.hpp>

 #include <boost/detail/workaround.hpp>

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

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

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

 namespace boost

 {

 //

 //  shared_array

 //

 //  shared_array extends shared_ptr to arrays.

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

 //  is destroyed or reset.

 //

 template<class T> class shared_array

 {

 private:

     // Borland 5.5.1 specific workarounds

     typedef checked_array_deleter<T> deleter;

     typedef shared_array<T> this_type;

 public:

     typedef T element_type;

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

     {

     }

     //

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

     //

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

     //

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

     {

     }

 //  generated copy constructor, assignment, destructor are fine

     void reset(T * p = 0)

     {

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

         this_type(p).swap(*this);

     }

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

     {

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

     }

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

     {

         BOOST_ASSERT(px != 0);

         BOOST_ASSERT(i >= 0);

         return px[i];

     }

     T * get() const // never throws

     {

         return px;

     }

     // implicit conversion to "bool"

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

     operator bool () const

     {

         return px != 0;

     }

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

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

     operator unspecified_bool_type() const // never throws

     {

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

     }

 #else 

     typedef T * this_type::*unspecified_bool_type;

     operator unspecified_bool_type() const // never throws

     {

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

     }

 #endif

     bool operator! () const // never throws

     {

         return px == 0;

     }

     bool unique() const // never throws

     {

         return pn.unique();

     }

     long use_count() const // never throws

     {

         return pn.use_count();

     }

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

     {

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

         pn.swap(other.pn);

     }

 private:

     T * px;                     // contained pointer

     detail::shared_count pn;    // reference counter

 };  // shared_array

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

 {

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

 }

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

 {

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

 }

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

 {

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

 }

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

 {

     a.swap(b);

 }

 } // namespace boost

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

 #endif  // #ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED