boost/mpl/vector/aux_/item.hpp
//-----------------------------------------------------------------------------
// boost mpl/vector/aux_/item.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2000-02
// Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appears in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation. No representations are made about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
#ifndef BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
#define BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
#include "boost/mpl/integral_c.hpp"
#include "boost/mpl/aux_/config/vector.hpp"
#include "boost/mpl/aux_/config/ctps.hpp"
namespace boost {
namespace mpl {
#if defined(BOOST_MPL_TYPEOF_BASED_VECTOR_IMPL)
template< typename V, long N >
struct vector_item
{
typedef __typeof__(V::item(integral_c<long,V::size::value - N - 1>())) wrapped_type_;
typedef typename wrapped_type_::type type;
};
#else
// agurt, 29/sep/02: Borland 5.5.1 does a poor job on partial
// specialization here
# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
&& !defined(BOOST_NO_NON_TYPE_TEMPLATE_PARTIAL_SPECIALIZATION)
// forward declaration
template< typename T, long N >
struct vector_item;
# else
namespace aux {
template< long N > struct vector_item_impl
{
template< typename V > struct result_;
};
} // namespace aux
template< typename T, long N >
struct vector_item
: aux::vector_item_impl<N>::template result_<T>
{
};
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#endif // BOOST_MPL_TYPEOF_BASED_VECTOR_IMPL
} // namespace mpl
} // namespace boost
#endif // BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED