Chris@16: 
Chris@16: #ifndef BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
Chris@16: #define BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
Chris@16: 
Chris@16: // Copyright Aleksey Gurtovoy 2000-2004
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. 
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/mpl for documentation.
Chris@16: 
Chris@101: // $Id$
Chris@101: // $Date$
Chris@101: // $Revision$
Chris@16: 
Chris@16: #include <boost/mpl/long.hpp>
Chris@16: #include <boost/mpl/void.hpp>
Chris@16: #include <boost/mpl/next_prior.hpp>
Chris@16: #include <boost/mpl/aux_/type_wrapper.hpp>
Chris@16: #include <boost/mpl/aux_/config/typeof.hpp>
Chris@16: #include <boost/mpl/aux_/config/ctps.hpp>
Chris@16: 
Chris@16: namespace boost { namespace mpl {
Chris@16: 
Chris@16: #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
Chris@16: 
Chris@16: template< 
Chris@16:       typename T
Chris@16:     , typename Base
Chris@16:     , int at_front = 0
Chris@16:     >
Chris@16: struct v_item
Chris@16:     : Base
Chris@16: {
Chris@16:     typedef typename Base::upper_bound_ index_;
Chris@16:     typedef typename next<index_>::type upper_bound_;
Chris@16:     typedef typename next<typename Base::size>::type size;
Chris@16:     typedef Base base;
Chris@16:     typedef v_item type;
Chris@16: 
Chris@16:     // agurt 10/sep/04: MWCW <= 9.3 workaround here and below; the compiler
Chris@16:     // breaks if using declaration comes _before_ the new overload
Chris@16:     static aux::type_wrapper<T> item_(index_);
Chris@16:     using Base::item_;
Chris@16: };
Chris@16: 
Chris@16: template<
Chris@16:       typename T
Chris@16:     , typename Base
Chris@16:     >
Chris@16: struct v_item<T,Base,1>
Chris@16:     : Base
Chris@16: {
Chris@16:     typedef typename prior<typename Base::lower_bound_>::type index_;
Chris@16:     typedef index_ lower_bound_;
Chris@16:     typedef typename next<typename Base::size>::type size;
Chris@16:     typedef Base base;
Chris@16:     typedef v_item type;
Chris@16: 
Chris@16:     static aux::type_wrapper<T> item_(index_);
Chris@16:     using Base::item_;
Chris@16: };
Chris@16: 
Chris@16: // "erasure" item
Chris@16: template< 
Chris@16:       typename Base
Chris@16:     , int at_front
Chris@16:     >
Chris@16: struct v_mask
Chris@16:     : Base
Chris@16: {
Chris@16:     typedef typename prior<typename Base::upper_bound_>::type index_;
Chris@16:     typedef index_ upper_bound_;
Chris@16:     typedef typename prior<typename Base::size>::type size;
Chris@16:     typedef Base base;
Chris@16:     typedef v_mask type;
Chris@16: 
Chris@16:     static aux::type_wrapper<void_> item_(index_);
Chris@16:     using Base::item_;
Chris@16: };
Chris@16: 
Chris@16: template< 
Chris@16:       typename Base
Chris@16:     >
Chris@16: struct v_mask<Base,1>
Chris@16:     : Base
Chris@16: {
Chris@16:     typedef typename Base::lower_bound_ index_;
Chris@16:     typedef typename next<index_>::type lower_bound_;
Chris@16:     typedef typename prior<typename Base::size>::type size;
Chris@16:     typedef Base base;
Chris@16:     typedef v_mask type;
Chris@16: 
Chris@16:     static aux::type_wrapper<void_> item_(index_);
Chris@16:     using Base::item_;
Chris@16: };
Chris@16: 
Chris@16: #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif // BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED