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