ext-boost/boost/mpl/vector/aux_/item.hpp

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2019-08-24 13:39:04 +00:00
#ifndef BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
#define BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2004
//
// 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/mpl for documentation.
// $Id$
// $Date$
// $Revision$
#include <boost/mpl/long.hpp>
#include <boost/mpl/void.hpp>
#include <boost/mpl/next_prior.hpp>
#include <boost/mpl/aux_/type_wrapper.hpp>
#include <boost/mpl/aux_/config/typeof.hpp>
#include <boost/mpl/aux_/config/ctps.hpp>
namespace boost { namespace mpl {
#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
template<
typename T
, typename Base
, int at_front = 0
>
struct v_item
: Base
{
typedef typename Base::upper_bound_ index_;
typedef typename next<index_>::type upper_bound_;
typedef typename next<typename Base::size>::type size;
typedef Base base;
typedef v_item type;
// agurt 10/sep/04: MWCW <= 9.3 workaround here and below; the compiler
// breaks if using declaration comes _before_ the new overload
static aux::type_wrapper<T> item_(index_);
using Base::item_;
};
template<
typename T
, typename Base
>
struct v_item<T,Base,1>
: Base
{
typedef typename prior<typename Base::lower_bound_>::type index_;
typedef index_ lower_bound_;
typedef typename next<typename Base::size>::type size;
typedef Base base;
typedef v_item type;
static aux::type_wrapper<T> item_(index_);
using Base::item_;
};
// "erasure" item
template<
typename Base
, int at_front
>
struct v_mask
: Base
{
typedef typename prior<typename Base::upper_bound_>::type index_;
typedef index_ upper_bound_;
typedef typename prior<typename Base::size>::type size;
typedef Base base;
typedef v_mask type;
static aux::type_wrapper<void_> item_(index_);
using Base::item_;
};
template<
typename Base
>
struct v_mask<Base,1>
: Base
{
typedef typename Base::lower_bound_ index_;
typedef typename next<index_>::type lower_bound_;
typedef typename prior<typename Base::size>::type size;
typedef Base base;
typedef v_mask type;
static aux::type_wrapper<void_> item_(index_);
using Base::item_;
};
#endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
}}
#endif // BOOST_MPL_VECTOR_AUX_ITEM_HPP_INCLUDED