ceph/src/boost/libs/leaf/test/to_variant_test.cpp

   1 // Copyright 2018-2022 Emil Dotchevski and Reverge Studios, Inc.
   2
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #if __cplusplus < 201703L
   7
   8 #include <iostream>
   9
  10 int main()
  11 {
  12     std::cout << "Unit test not applicable." << std::endl;
  13     return 0;
  14 }
  15
  16 #else
  17
  18 #ifdef BOOST_LEAF_TEST_SINGLE_HEADER
  19 #   include "leaf.hpp"
  20 #else
  21 #   include <boost/leaf/to_variant.hpp>
  22 #endif
  23
  24 #include "_test_ec.hpp"
  25 #include "lightweight_test.hpp"
  26
  27 namespace leaf = boost::leaf;
  28
  29 enum class E1 { e11, e12, e13 };
  30 enum class E2 { e21, e22, e23 };
  31 enum class E3 { e31, e32, e33 };
  32
  33 int main()
  34 {
  35 #if !defined(__clang__) || __clang_major__ < 5 || __clang_major__ > 7 // See https://github.com/llvm/llvm-project/issues/32569
  36     {
  37         auto v = leaf::to_variant<E1, E2, E3>(
  38             [ ]() -> leaf::result<int>
  39             {
  40                 return 42;
  41             } );
  42         BOOST_TEST(v.index() == 0);
  43         BOOST_TEST(std::get<0>(v) == 42);
  44     }
  45
  46     {
  47         auto v = leaf::to_variant<E1, E2, E3>(
  48             [ ]() -> leaf::result<int>
  49             {
  50                 return leaf::new_error(E1::e12, E3::e31);
  51             } );
  52         BOOST_TEST(v.index() == 1);
  53         auto t = std::get<1>(v);
  54
  55         BOOST_TEST(std::get<0>(t).has_value());
  56         BOOST_TEST(!std::get<1>(t).has_value());
  57         BOOST_TEST(std::get<2>(t).has_value());
  58
  59         BOOST_TEST(std::get<0>(t).value() == E1::e12);
  60         BOOST_TEST(std::get<2>(t).value() == E3::e31);
  61     }
  62 #endif
  63
  64     return boost::report_errors();
  65 }
  66
  67 #endif