1/* Unit testing for outcomes
2(C) 2013-2024 Niall Douglas <http://www.nedproductions.biz/> (5 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/outcome/try.hpp>
32#include <boost/test/unit_test.hpp>
33#include <boost/test/unit_test_monitor.hpp>
34
35BOOST_OUTCOME_AUTO_TEST_CASE(issues_0007_test, "BOOST_OUTCOME_TRYV(expr) in a function whose return outcome's type has no default constructor fails to compile")
36{
37 using namespace BOOST_OUTCOME_V2_NAMESPACE;
38 struct udt // NOLINT
39 {
40 explicit udt(int /*unused*/) {}
41 // udt() = delete;
42 udt(const udt &) = default;
43 udt(udt &&) = default;
44 };
45 {
46 auto f = []() -> result<udt> {
47 auto g = [] { return result<int>(5); };
48 /* This fails because BOOST_OUTCOME_TRYV() returns a result<void>
49 which if it were valued void, would implicitly convert into a
50 default constructed udt which is not possible, hence the compile error.
51 */
52 BOOST_OUTCOME_TRYV(g());
53 return udt(5);
54 };
55 (void) f();
56 }
57 {
58 auto f = []() -> outcome<udt> {
59 auto g = [] { return outcome<int>(5); };
60 /* This fails because BOOST_OUTCOME_TRYV() returns a result<void>
61 which if it were valued void, would implicitly convert into a
62 default constructed udt which is not possible, hence the compile error.
63 */
64 BOOST_OUTCOME_TRYV(g());
65 return udt(5);
66 };
67 (void) f();
68 }
69 {
70 auto f = []() -> outcome<udt> {
71 auto g = [] { return result<int>(5); };
72 /* This fails because BOOST_OUTCOME_TRYV() returns a result<void>
73 which if it were valued void, would implicitly convert into a
74 default constructed udt which is not possible, hence the compile error.
75 */
76 BOOST_OUTCOME_TRYV(g());
77 return udt(5);
78 };
79 (void) f();
80 }
81}
82

source code of boost/libs/outcome/test/tests/issue0007.cpp