| 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 | |
| 56 |