boost/multi_index/detail/is_index_list.hpp

/* Copyright 2003-2013 Joaquin M Lopez Munoz.
 * 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/multi_index for library home page.
 */
#ifndef BOOST_MULTI_INDEX_DETAIL_IS_INDEX_LIST_HPP
#define BOOST_MULTI_INDEX_DETAIL_IS_INDEX_LIST_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
#include <boost/mpl/empty.hpp>
#include <boost/mpl/is_sequence.hpp>
namespace boost{
namespace multi_index{
namespace detail{
template<typename T>
struct is_index_list
{
  BOOST_STATIC_CONSTANT(bool,mpl_sequence=mpl::is_sequence<T>::value);
  BOOST_STATIC_CONSTANT(bool,non_empty=!mpl::empty<T>::value);
  BOOST_STATIC_CONSTANT(bool,value=mpl_sequence&&non_empty);
};
} /* namespace multi_index::detail */
} /* namespace multi_index */
} /* namespace boost */
#endif