multi_index/detail/is_index_list.hpp

0001 /* Copyright 2003-2013 Joaquin M Lopez Munoz.
0002  * Distributed under the Boost Software License, Version 1.0.
0003  * (See accompanying file LICENSE_1_0.txt or copy at
0004  * http://www.boost.org/LICENSE_1_0.txt)
0005  *
0006  * See http://www.boost.org/libs/multi_index for library home page.
0007  */
0008
0009 #ifndef BOOST_MULTI_INDEX_DETAIL_IS_INDEX_LIST_HPP
0010 #define BOOST_MULTI_INDEX_DETAIL_IS_INDEX_LIST_HPP
0011
0012 #if defined(_MSC_VER)
0013 #pragma once
0014 #endif
0015
0016 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
0017 #include <boost/mpl/empty.hpp>
0018 #include <boost/mpl/is_sequence.hpp>
0019
0020 namespace boost{
0021
0022 namespace multi_index{
0023
0024 namespace detail{
0025
0026 template<typename T>
0027 struct is_index_list
0028 {
0029   BOOST_STATIC_CONSTANT(bool,mpl_sequence=mpl::is_sequence<T>::value);
0030   BOOST_STATIC_CONSTANT(bool,non_empty=!mpl::empty<T>::value);
0031   BOOST_STATIC_CONSTANT(bool,value=mpl_sequence&&non_empty);
0032 };
0033
0034 } /* namespace multi_index::detail */
0035
0036 } /* namespace multi_index */
0037
0038 } /* namespace boost */
0039
0040 #endif