56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
// Copyright Abel Sinkovics (abel@sinkovics.hu) 2015.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/metaparse/optional.hpp>
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#include <boost/metaparse/string.hpp>
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#include <boost/metaparse/lit_c.hpp>
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#include <boost/metaparse/get_result.hpp>
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#include <boost/metaparse/start.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/equal_to.hpp>
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#include <boost/mpl/char.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include "test_case.hpp"
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BOOST_METAPARSE_TEST_CASE(optional)
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{
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using boost::metaparse::optional;
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using boost::metaparse::lit_c;
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using boost::metaparse::string;
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using boost::metaparse::get_result;
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using boost::metaparse::start;
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using boost::mpl::equal_to;
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using boost::is_same;
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typedef optional<lit_c<'x'>, double> optional_x;
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// test_optional_parser_succeeds
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BOOST_MPL_ASSERT((
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equal_to<
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boost::mpl::char_<'x'>,
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get_result<optional_x::apply<string<'x'>, start> >::type
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>
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));
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// test_optional_parser_fails
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BOOST_MPL_ASSERT((
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is_same<double, get_result<optional_x::apply<string<'y'>, start> >::type>
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));
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// test_optional_parser_default_value
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BOOST_MPL_ASSERT((
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is_same<
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void,
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get_result<optional<lit_c<'x'> >::apply<string<'y'>, start> >::type
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>
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));
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}
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