1/* Unit testing for outcomes
2(C) 2013-2024 Niall Douglas <http://www.nedproductions.biz/> (3 commits)
3
4
5Boost Software License - Version 1.0 - August 17th, 2003
6
7Permission is hereby granted, free of charge, to any person or organization
8obtaining a copy of the software and accompanying documentation covered by
9this license (the "Software") to use, reproduce, display, distribute,
10execute, and transmit the Software, and to prepare derivative works of the
11Software, and to permit third-parties to whom the Software is furnished to
12do so, all subject to the following:
13
14The copyright notices in the Software and this entire statement, including
15the above license grant, this restriction and the following disclaimer,
16must be included in all copies of the Software, in whole or in part, and
17all derivative works of the Software, unless such copies or derivative
18works are solely in the form of machine-executable object code generated by
19a source language processor.
20
21THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
24SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
25FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
26ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27DEALINGS IN THE SOFTWARE.
28*/
29
30#include <boost/outcome.hpp>
31#include <boost/test/unit_test.hpp>
32#include <boost/test/unit_test_monitor.hpp>
33
34BOOST_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}
107

source code of boost/libs/outcome/test/tests/value-or-error.cpp