ceph/src/boost/libs/spirit/test/x3/eps.cpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2015 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7 #include <boost/detail/lightweight_test.hpp>
   8 #include <boost/spirit/home/x3.hpp>
   9
  10 #include <iostream>
  11 #include "test.hpp"
  12
  13 int
  14 main()
  15 {
  16     using spirit_test::test;
  17     using boost::spirit::x3::eps;
  18     using boost::spirit::x3::unused_type;
  19
  20     {
  21         BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps);
  22         BOOST_TEST((test("", eps)));
  23         BOOST_TEST((test("xxx", eps, false)));
  24         //~ BOOST_TEST((!test("", !eps))); // not predicate $$$ Implement me! $$$
  25     }
  26
  27     {   // test non-lazy semantic predicate
  28
  29         BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps(true));
  30         BOOST_TEST((test("", eps(true))));
  31         BOOST_TEST((!test("", eps(false))));
  32         BOOST_TEST((test("", !eps(false))));
  33     }
  34
  35     {   // test lazy semantic predicate
  36
  37         auto true_ = [](unused_type) { return true; };
  38         auto false_ = [](unused_type) { return false; };
  39
  40         // cannot use lambda in constant expression before C++17
  41         BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps(std::true_type{}));
  42         BOOST_TEST((test("", eps(true_))));
  43         BOOST_TEST((!test("", eps(false_))));
  44         BOOST_TEST((test("", !eps(false_))));
  45     }
  46
  47     return boost::report_errors();
  48 }