49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2015 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#include <boost/detail/lightweight_test.hpp>
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#include <boost/spirit/home/x3.hpp>
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#include <iostream>
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#include "test.hpp"
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int
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main()
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{
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using spirit_test::test;
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using boost::spirit::x3::eps;
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using boost::spirit::x3::unused_type;
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{
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BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps);
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BOOST_TEST((test("", eps)));
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BOOST_TEST((test("xxx", eps, false)));
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//~ BOOST_TEST((!test("", !eps))); // not predicate $$$ Implement me! $$$
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}
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{ // test non-lazy semantic predicate
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BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps(true));
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BOOST_TEST((test("", eps(true))));
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BOOST_TEST((!test("", eps(false))));
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BOOST_TEST((test("", !eps(false))));
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}
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{ // test lazy semantic predicate
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auto true_ = [](unused_type) { return true; };
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auto false_ = [](unused_type) { return false; };
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// cannot use lambda in constant expression before C++17
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BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps(std::true_type{}));
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BOOST_TEST((test("", eps(true_))));
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BOOST_TEST((!test("", eps(false_))));
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BOOST_TEST((test("", !eps(false_))));
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}
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return boost::report_errors();
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}
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