100 lines
4.6 KiB
C++
100 lines
4.6 KiB
C++
/* Unit testing for outcomes
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(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (9 commits)
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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/outcome.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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BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_constexpr, "Tests that outcome works as intended in a constexpr evaluation context")
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{
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using namespace BOOST_OUTCOME_V2_NAMESPACE;
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static_assert(std::is_literal_type<result<int, void, void>>::value, "result<int, void, void> is not a literal type!");
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static_assert(std::is_literal_type<outcome<int, void, void>>::value, "outcome<int, void, void> is not a literal type!");
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// Unfortunately result<T> can never be a literal type as error_code can never be literal
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//
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// It can however be trivially destructible as error_code is trivially destructible. That
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// makes possible lots of compiler optimisations
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static_assert(std::is_trivially_destructible<result<int>>::value, "result<int> is not trivially destructible!");
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static_assert(std::is_trivially_destructible<result<void>>::value, "result<void> is not trivially destructible!");
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// outcome<T> default has no trivial operations, but if configured it can become so
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static_assert(std::is_trivially_destructible<outcome<int, boost::system::error_code, void>>::value, "outcome<int, boost::system::error_code, void> is not trivially destructible!");
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{
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// Test compatible results can be constructed from one another
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constexpr result<int, long> g(in_place_type<int>, 5);
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constexpr result<long, int> g2(g);
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static_assert(g.has_value(), "");
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static_assert(!g.has_error(), "");
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static_assert(g.assume_value() == 5, ""); // value() with UDT E won't compile
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static_assert(g2.has_value(), "");
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static_assert(!g2.has_error(), "");
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static_assert(g2.assume_value() == 5, ""); // value() with UDT E won't compile
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constexpr result<void, int> g3(in_place_type<void>);
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constexpr result<long, int> g4(g3);
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constexpr result<int, void> g5(in_place_type<void>);
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constexpr result<long, int> g6(g5);
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(void) g4;
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(void) g6;
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// Test void
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constexpr result<void, int> h(in_place_type<void>);
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static_assert(h.has_value(), "");
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constexpr result<int, void> h2(in_place_type<void>);
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static_assert(!h2.has_value(), "");
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static_assert(h2.has_error(), "");
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// Test const
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constexpr result<const int, void> i(5);
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constexpr result<const int, void> i2(i);
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(void) i2;
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}
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{
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// Test compatible outcomes can be constructed from one another
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constexpr outcome<int, long, char *> g(in_place_type<int>, 5);
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constexpr outcome<long, int, const char *> g2(g);
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static_assert(g.has_value(), "");
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static_assert(!g.has_error(), "");
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static_assert(!g.has_exception(), "");
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static_assert(g.assume_value() == 5, ""); // value() with UDT E won't compile
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static_assert(g2.has_value(), "");
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static_assert(!g2.has_error(), "");
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static_assert(!g2.has_exception(), "");
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static_assert(g2.assume_value() == 5, ""); // value() with UDT E won't compile
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constexpr outcome<void, int, char *> g3(in_place_type<void>);
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constexpr outcome<long, int, const char *> g4(g3);
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constexpr outcome<int, void, char *> g5(in_place_type<void>);
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constexpr outcome<long, int, const char *> g6(g5);
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(void) g4;
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(void) g6;
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}
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}
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