ceph/src/boost/libs/outcome/test/tests/value-or-error.cpp

   1 /* Unit testing for outcomes
   2 (C) 2013-2020 Niall Douglas <http://www.nedproductions.biz/> (3 commits)
   3
   4
   5 Boost Software License - Version 1.0 - August 17th, 2003
   6
   7 Permission is hereby granted, free of charge, to any person or organization
   8 obtaining a copy of the software and accompanying documentation covered by
   9 this license (the "Software") to use, reproduce, display, distribute,
  10 execute, and transmit the Software, and to prepare derivative works of the
  11 Software, and to permit third-parties to whom the Software is furnished to
  12 do so, all subject to the following:
  13
  14 The copyright notices in the Software and this entire statement, including
  15 the above license grant, this restriction and the following disclaimer,
  16 must be included in all copies of the Software, in whole or in part, and
  17 all derivative works of the Software, unless such copies or derivative
  18 works are solely in the form of machine-executable object code generated by
  19 a source language processor.
  20
  21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  24 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  25 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  26 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  27 DEALINGS IN THE SOFTWARE.
  28 */
  29
  30 #include <boost/outcome/outcome.hpp>
  31 #include <boost/test/unit_test.hpp>
  32 #include <boost/test/unit_test_monitor.hpp>
  33
  34 BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_valueorerror, "Tests that outcome constructs from value_or_error and value_or_none concept inputs")
  35 {
  36   using namespace BOOST_OUTCOME_V2_NAMESPACE;
  37   {
  38     struct value_or_error
  39     {
  40       using value_type = int;
  41       using error_type = void;
  42       bool has_value() const { return true; }
  43       int value() const { return 78; }
  44       void error() const {}
  45     } a;
  46     static_assert(concepts::value_or_none<value_or_error>, "");
  47     static_assert(concepts::value_or_error<value_or_error>, "");
  48     static_assert(!concepts::basic_result<value_or_error>, "");
  49     static_assert(!concepts::basic_outcome<value_or_error>, "");
  50     BOOST_CHECK((convert::value_or_error<result<long>, value_or_error>{}(a).value() == 78));
  51
  52     result<long> b(a);
  53     BOOST_CHECK(b.has_value());
  54     BOOST_CHECK(b.value() == 78);
  55
  56     struct local_basic_result1 : result<int>
  57     {
  58     };
  59     static_assert(concepts::value_or_none<local_basic_result1>, "");
  60     static_assert(concepts::value_or_error<local_basic_result1>, "");
  61     static_assert(concepts::basic_result<result<int>>, "");
  62     static_assert(concepts::basic_result<local_basic_result1>, "");
  63     static_assert(!concepts::basic_outcome<result<int>>, "");
  64     static_assert(!concepts::basic_outcome<local_basic_result1>, "");
  65
  66     struct local_basic_result2 : protected result<int>
  67     {
  68       using _base = result<int>;
  69       using value_type = _base::value_type;
  70       using error_type = _base::error_type;
  71       using _base::has_value;
  72       using _base::value;
  73       using _base::error;
  74     };
  75     static_assert(concepts::value_or_none<local_basic_result2>, "");
  76     static_assert(concepts::value_or_error<local_basic_result2>, "");
  77     static_assert(!concepts::basic_result<local_basic_result2>, "");
  78     static_assert(!concepts::basic_outcome<local_basic_result2>, "");
  79
  80     struct local_basic_outcome1 : outcome<int>
  81     {
  82     };
  83     static_assert(!std::is_convertible<outcome<int>, result<int>>::value, "");
  84     static_assert(!std::is_convertible<local_basic_outcome1, result<int>>::value, "");
  85     static_assert(concepts::value_or_none<local_basic_outcome1>, "");
  86     static_assert(concepts::value_or_error<local_basic_outcome1>, "");
  87     static_assert(!concepts::basic_result<outcome<int>>, "");
  88     static_assert(!concepts::basic_result<local_basic_outcome1>, "");
  89     static_assert(concepts::basic_outcome<local_basic_outcome1>, "");
  90
  91     struct local_basic_outcome2 : protected outcome<int>
  92     {
  93       using _base = outcome<int>;
  94       using value_type = _base::value_type;
  95       using error_type = _base::error_type;
  96       using exception_type = _base::exception_type;
  97       using _base::error;
  98       using _base::has_value;
  99       using _base::value;
 100     };
 101     static_assert(concepts::value_or_none<local_basic_outcome2>, "");
 102     static_assert(concepts::value_or_error<local_basic_outcome2>, "");
 103     static_assert(!concepts::basic_result<local_basic_outcome2>, "");
 104     static_assert(!concepts::basic_outcome<local_basic_outcome2>, "");
 105   }
 106 }