//

// Boost.Pointer Container

//

//  Copyright Thorsten Ottosen 2003-2005. Use, modification and

//  distribution is subject to 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)

//

// For more information, see http://www.boost.org/libs/ptr_container/

//

#ifndef BOOST_PTR_CONTAINER_SCOPED_DELETER_HPP

#define BOOST_PTR_CONTAINER_SCOPED_DELETER_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)

# pragma once

#endif

#include <iterator>

#include <cstddef>

#include <boost/scoped_array.hpp>

namespace boost

{

    namespace ptr_container_detail

    {

        template< class T, class CloneAllocator >

        class scoped_deleter

        {

            typedef std::size_t size_type;

            scoped_array<T*>  ptrs_;

            size_type         stored_; 

            bool              released_;

        public:

            scoped_deleter( size_type size ) : 

                ptrs_( new T*[size] ), stored_( 0 ), 

                released_( false )

            {

                BOOST_ASSERT( size > 0 );

            }

            scoped_deleter( size_type n, const T& x ) // strong

                : ptrs_( new T*[n] ), stored_(0),

                  released_( false )

            {

                for( size_type i = 0; i != n; i++ )

                    add( CloneAllocator::allocate_clone( &x ) );

                BOOST_ASSERT( stored_ > 0 );

            }

            template< class InputIterator >

            scoped_deleter ( InputIterator first, InputIterator last  ) // strong

                : ptrs_( new T*[ std::distance(first,last) ] ),

                  stored_(0),

                  released_( false )

            {

                for( ; first != last; ++first )

                    add( CloneAllocator::allocate_clone_from_iterator( first ) );

                BOOST_ASSERT( stored_ > 0 );

            }

            ~scoped_deleter()

            {

                if ( !released_ )

                {

                    for( size_type i = 0u; i != stored_; ++i )

                        CloneAllocator::deallocate_clone( ptrs_[i] ); 

                }

            }

            void add( T* t )

            {

                BOOST_ASSERT( ptrs_.get() != 0 );

                ptrs_[stored_] = t;

                ++stored_;

            }

            void release()

            {

                released_ = true;

            }

            T** begin()

            {

                BOOST_ASSERT( ptrs_.get() != 0 );

                return &ptrs_[0];

            }

            T** end()

            {

                BOOST_ASSERT( ptrs_.get() != 0 );

                return &ptrs_[stored_];

            }

        }; // class 'scoped_deleter'

    }

}

#endif