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- /* Unit testing for outcomes
- (C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (1 commit)
- Boost Software License - Version 1.0 - August 17th, 2003
- Permission is hereby granted, free of charge, to any person or organization
- obtaining a copy of the software and accompanying documentation covered by
- this license (the "Software") to use, reproduce, display, distribute,
- execute, and transmit the Software, and to prepare derivative works of the
- Software, and to permit third-parties to whom the Software is furnished to
- do so, all subject to the following:
- The copyright notices in the Software and this entire statement, including
- the above license grant, this restriction and the following disclaimer,
- must be included in all copies of the Software, in whole or in part, and
- all derivative works of the Software, unless such copies or derivative
- works are solely in the form of machine-executable object code generated by
- a source language processor.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
- SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
- FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
- ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- DEALINGS IN THE SOFTWARE.
- */
- #include <boost/outcome/std_result.hpp>
- #include <boost/outcome/try.hpp>
- #include <boost/test/unit_test.hpp>
- #include <boost/test/unit_test_monitor.hpp>
- namespace outcome = BOOST_OUTCOME_V2_NAMESPACE;
- enum class error
- {
- test,
- abcde
- };
- class error_category_impl : public std::error_category
- {
- public:
- const char *name() const noexcept override { return "test"; }
- std::string message(int code) const noexcept override
- {
- switch(static_cast<error>(code))
- {
- case error::test:
- return "test";
- case error::abcde:
- return "abcde";
- }
- return "unknown";
- }
- };
- const std::error_category &error_category() noexcept
- {
- static error_category_impl instance;
- return instance;
- }
- boost::system::error_code make_error_code(error error) noexcept
- {
- return {static_cast<int>(error), error_category()};
- }
- namespace std
- {
- template <> struct is_error_code_enum<error> : true_type
- {
- };
- } // namespace std
- template <typename T> using enum_result = outcome::basic_result<T, error, outcome::policy::default_policy<T, error, void>>;
- enum_result<int> test()
- {
- return 5;
- }
- outcome::std_result<int> abc()
- {
- static_assert(std::is_error_code_enum<error>::value, "custom enum is not marked convertible to error code");
- static_assert(std::is_constructible<boost::system::error_code, error>::value, "error code is not explicitly constructible from custom enum");
- static_assert(std::is_convertible<error, boost::system::error_code>::value, "error code is not implicitly constructible from custom enum");
- boost::system::error_code ec = error::test; // custom enum is definitely convertible to error code
- BOOST_OUTCOME_TRY(test()); // hence this should compile, as implicit conversions work here
- (void) ec;
- // But explicit conversions are required between dissimilar basic_result, implicit conversions are disabled
- static_assert(std::is_constructible<outcome::std_result<int>, enum_result<int>>::value, "basic_result with error code is not explicitly constructible from basic_result with custom enum");
- static_assert(!std::is_convertible<enum_result<int>, outcome::std_result<int>>::value, "basic_result with error code is implicitly constructible from basic_result with custom enum");
- return 5;
- }
- BOOST_OUTCOME_AUTO_TEST_CASE(issues_0203_test, "enum convertible to error code works as designed")
- {
- BOOST_CHECK(abc().value() == 5);
- }
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