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

   1 // Copyright Abel Sinkovics (abel@sinkovics.hu) 2015.
   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/optional.hpp>
   7 #include <boost/metaparse/string.hpp>
   8 #include <boost/metaparse/lit_c.hpp>
   9 #include <boost/metaparse/get_result.hpp>
  10 #include <boost/metaparse/start.hpp>
  11
  12 #include <boost/mpl/assert.hpp>
  13 #include <boost/mpl/equal_to.hpp>
  14 #include <boost/mpl/char.hpp>
  15
  16 #include <boost/type_traits/is_same.hpp>
  17
  18 #include "test_case.hpp"
  19
  20 BOOST_METAPARSE_TEST_CASE(optional)
  21 {
  22   using boost::metaparse::optional;
  23   using boost::metaparse::lit_c;
  24   using boost::metaparse::string;
  25   using boost::metaparse::get_result;
  26   using boost::metaparse::start;
  27
  28   using boost::mpl::equal_to;
  29
  30   using boost::is_same;
  31
  32   typedef optional<lit_c<'x'>, double> optional_x;
  33
  34   // test_optional_parser_succeeds
  35   BOOST_MPL_ASSERT((
  36     equal_to<
  37       boost::mpl::char_<'x'>,
  38       get_result<optional_x::apply<string<'x'>, start> >::type
  39     >
  40   ));
  41
  42   // test_optional_parser_fails
  43   BOOST_MPL_ASSERT((
  44     is_same<double, get_result<optional_x::apply<string<'y'>, start> >::type>
  45   ));
  46
  47   // test_optional_parser_default_value
  48   BOOST_MPL_ASSERT((
  49     is_same<
  50       void,
  51       get_result<optional<lit_c<'x'> >::apply<string<'y'>, start> >::type
  52     >
  53   ));
  54 }
  55