ceph/src/boost/libs/mpl/include/boost/mpl/empty_sequence.hpp

   1
   2 #ifndef BOOST_MPL_EMPTY_SEQUENCE_HPP_INCLUDED
   3 #define BOOST_MPL_EMPTY_SEQUENCE_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2004
   6 // Copyright Alexander Nasonov 2004
   7 //
   8 // Distributed under the Boost Software License, Version 1.0.
   9 // (See accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11 //
  12 // See http://www.boost.org/libs/mpl for documentation.
  13
  14 // $Id$
  15 // $Date$
  16 // $Revision$
  17
  18 #include <boost/mpl/size_fwd.hpp>
  19 #include <boost/mpl/int.hpp>
  20 #include <boost/mpl/iterator_tags.hpp>
  21
  22 namespace boost { namespace mpl {
  23
  24 struct empty_sequence
  25 {
  26     struct tag;
  27     typedef empty_sequence type;
  28     struct begin { typedef random_access_iterator_tag category; };
  29     typedef begin end;
  30 };
  31
  32 template<>
  33 struct size_impl<empty_sequence::tag>
  34 {
  35     template< typename Sequence > struct apply
  36         : int_<0>
  37     {
  38     };
  39 };
  40
  41 }}
  42
  43 #endif // #ifndef BOOST_MPL_EMPTY_SEQUENCE_HPP_INCLUDED