is_index_list.hpp

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/* 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