#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