ceph/src/boost/libs/metaparse/test/look_ahead.cpp

   1 // Copyright Abel Sinkovics (abel@sinkovics.hu) 2011.
   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 #include <boost/metaparse/look_ahead.hpp>
   7 #include <boost/metaparse/start.hpp>
   8 #include <boost/metaparse/get_result.hpp>
   9 #include <boost/metaparse/digit_val.hpp>
  10 #include <boost/metaparse/fail.hpp>
  11 #include <boost/metaparse/is_error.hpp>
  12 #include <boost/metaparse/get_remaining.hpp>
  13
  14 #include "common.hpp"
  15
  16 #include <boost/mpl/apply_wrap.hpp>
  17 #include <boost/mpl/equal_to.hpp>
  18 #include <boost/mpl/equal.hpp>
  19 #include <boost/mpl/assert.hpp>
  20
  21 #include "test_case.hpp"
  22
  23 BOOST_METAPARSE_TEST_CASE(look_ahead)
  24 {
  25
  26   using boost::metaparse::get_result;
  27   using boost::metaparse::look_ahead;
  28   using boost::metaparse::digit_val;
  29   using boost::metaparse::start;
  30   using boost::metaparse::is_error;
  31   using boost::metaparse::fail;
  32   using boost::metaparse::get_remaining;
  33
  34   using boost::mpl::equal_to;
  35   using boost::mpl::apply_wrap2;
  36   using boost::mpl::equal;
  37
  38   // test_returns_result
  39   BOOST_MPL_ASSERT((
  40     equal_to<
  41       int1,
  42       get_result<apply_wrap2<look_ahead<digit_val>, str_1983, start> >::type
  43     >
  44   ));
  45
  46   // test_returns_error
  47   BOOST_MPL_ASSERT((
  48     is_error<apply_wrap2<look_ahead<fail<int13> >, str_1983, start> >
  49   ));
  50
  51   // test_doesnt_process_input
  52   BOOST_MPL_ASSERT((
  53     equal<
  54       str_1983,
  55       get_remaining<apply_wrap2<look_ahead<digit_val>, str_1983, start> >::type
  56     >
  57   ));
  58 }
  59
  60