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/spirit/home/x3.hpp>
   8
   9 #include <iostream>
  10 #include "test.hpp"
  11
  12 int
  13 main()
  14 {
  15     using spirit_test::test;
  16     using boost::spirit::x3::eps;
  17     using boost::spirit::x3::unused_type;
  18
  19     {
  20         BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps);
  21         BOOST_TEST((test("", eps)));
  22         BOOST_TEST((test("xxx", eps, false)));
  23         //~ BOOST_TEST((!test("", !eps))); // not predicate $$$ Implement me! $$$
  24     }
  25
  26     {   // test non-lazy semantic predicate
  27
  28         BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps(true));
  29         BOOST_TEST((test("", eps(true))));
  30         BOOST_TEST((!test("", eps(false))));
  31         BOOST_TEST((test("", !eps(false))));
  32     }
  33
  34     {   // test lazy semantic predicate
  35
  36         auto true_ = [](unused_type) { return true; };
  37         auto false_ = [](unused_type) { return false; };
  38
  39         // cannot use lambda in constant expression before C++17
  40         BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(eps(std::true_type{}));
  41         BOOST_TEST((test("", eps(true_))));
  42         BOOST_TEST((!test("", eps(false_))));
  43         BOOST_TEST((test("", !eps(false_))));
  44     }
  45
  46     return boost::report_errors();
  47 }