ceph/src/boost/boost/multi_index/detail/is_index_list.hpp

   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