1 | /* Copyright 2003-2013 Joaquin M Lopez Munoz. |
---|---|
2 | * Distributed under the Boost Software License, Version 1.0. |
3 | * (See accompanying file LICENSE_1_0.txt or copy at |
4 | * http://www.boost.org/LICENSE_1_0.txt) |
5 | * |
6 | * See http://www.boost.org/libs/multi_index for library home page. |
7 | */ |
8 | |
9 | #ifndef BOOST_MULTI_INDEX_DETAIL_IS_INDEX_LIST_HPP |
10 | #define BOOST_MULTI_INDEX_DETAIL_IS_INDEX_LIST_HPP |
11 | |
12 | #if defined(_MSC_VER) |
13 | #pragma once |
14 | #endif |
15 | |
16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
17 | #include <boost/mpl/empty.hpp> |
18 | #include <boost/mpl/is_sequence.hpp> |
19 | |
20 | namespace boost{ |
21 | |
22 | namespace multi_index{ |
23 | |
24 | namespace detail{ |
25 | |
26 | template<typename T> |
27 | struct is_index_list |
28 | { |
29 | BOOST_STATIC_CONSTANT(bool,mpl_sequence=mpl::is_sequence<T>::value); |
30 | BOOST_STATIC_CONSTANT(bool,non_empty=!mpl::empty<T>::value); |
31 | BOOST_STATIC_CONSTANT(bool,value=mpl_sequence&&non_empty); |
32 | }; |
33 | |
34 | } /* namespace multi_index::detail */ |
35 | |
36 | } /* namespace multi_index */ |
37 | |
38 | } /* namespace boost */ |
39 | |
40 | #endif |
41 |