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

   1 #ifndef BOOST_METAPARSE_V1_FAIL_AT_FIRST_CHAR_EXPECTED_HPP
   2 #define BOOST_METAPARSE_V1_FAIL_AT_FIRST_CHAR_EXPECTED_HPP
   3
   4 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2015.
   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/impl/void_.hpp>
  10 #include <boost/metaparse/v1/accept.hpp>
  11 #include <boost/metaparse/v1/reject.hpp>
  12 #include <boost/metaparse/v1/is_error.hpp>
  13 #include <boost/metaparse/v1/get_position.hpp>
  14
  15 #include <boost/metaparse/v1/error/expected_to_fail.hpp>
  16
  17 #include <boost/mpl/eval_if.hpp>
  18 #include <boost/mpl/equal_to.hpp>
  19
  20 namespace boost
  21 {
  22   namespace metaparse
  23   {
  24     namespace v1
  25     {
  26       template <class P>
  27       struct fail_at_first_char_expected
  28       {
  29       private:
  30         template <class S, class Pos>
  31         struct apply_err :
  32           boost::mpl::eval_if<
  33             typename boost::mpl::equal_to<
  34               Pos,
  35               typename get_position<typename P::template apply<S, Pos> >::type
  36             >::type,
  37             accept<impl::void_, S, Pos>,
  38             typename P::template apply<S, Pos>
  39           >
  40         {};
  41       public:
  42         typedef fail_at_first_char_expected type;
  43
  44         template <class S, class Pos>
  45         struct apply :
  46           boost::mpl::eval_if<
  47             typename is_error<typename P::template apply<S, Pos> >::type,
  48             apply_err<S, Pos>,
  49             reject<error::expected_to_fail, Pos>
  50           >
  51         {};
  52       };
  53     }
  54   }
  55 }
  56
  57 #endif
  58