ceph/src/boost/boost/metaparse/v1/empty.hpp

   1 #ifndef BOOST_METAPARSE_V1_EMPTY_HPP
   2 #define BOOST_METAPARSE_V1_EMPTY_HPP
   3
   4 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2010 - 2011.
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #include <boost/metaparse/v1/error/end_of_input_expected.hpp>
  10 #include <boost/metaparse/v1/reject.hpp>
  11 #include <boost/metaparse/v1/accept.hpp>
  12 #include <boost/metaparse/v1/define_error.hpp>
  13
  14 #include <boost/mpl/empty.hpp>
  15 #include <boost/mpl/if.hpp>
  16
  17 namespace boost
  18 {
  19   namespace metaparse
  20   {
  21     namespace v1
  22     {
  23       template <class Result>
  24       struct empty
  25       {
  26         typedef empty type;
  27
  28         template <class S, class Pos>
  29         struct apply :
  30           boost::mpl::if_<
  31             boost::mpl::empty<S>,
  32             accept<Result, S, Pos>,
  33             reject<error::end_of_input_expected, Pos>
  34           >
  35         {};
  36       };
  37     }
  38   }
  39 }
  40
  41 #endif
  42