115 lines
5.2 KiB
C++
115 lines
5.2 KiB
C++
/* Unit testing for outcomes
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(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (14 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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#define _CRT_SECURE_NO_WARNINGS
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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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#include <iostream>
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namespace hook_test
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{
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using BOOST_OUTCOME_V2_NAMESPACE::in_place_type;
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// Use static storage to convey extended error info from result construction to outcome conversion
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static char extended_error_info[256];
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// Use the error_code type as the ADL bridge for the hooks by creating a type here
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struct error_code : public boost::system::error_code
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{
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using boost::system::error_code::error_code;
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error_code() = default;
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error_code(boost::system::error_code ec) // NOLINT
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: boost::system::error_code(ec)
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{
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}
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};
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// Localise result to using the local error_code so this namespace gets looked up for the hooks
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template <class R> using result = BOOST_OUTCOME_V2_NAMESPACE::result<R, error_code>;
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// Specialise the result construction hook for our localised result
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template <class U> constexpr inline void hook_result_construction(result<int> *res, U && /*unused*/) noexcept
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{
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// Write the value in the result into the static storage
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snprintf(extended_error_info, sizeof(extended_error_info), "%d", res->assume_value()); // NOLINT
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}
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template <class U> constexpr inline void hook_result_construction(result<std::string> *res, U && /*unused*/) noexcept
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{
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// Write the value in the result into the static storage
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snprintf(extended_error_info, sizeof(extended_error_info), "%s", res->assume_value().c_str()); // NOLINT
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}
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} // namespace hook_test
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BOOST_OUTCOME_AUTO_TEST_CASE(works_result_hooks, "Tests that you can hook result's construction")
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{
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using namespace hook_test;
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result<int> a(5);
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BOOST_CHECK(!strcmp(extended_error_info, "5")); // NOLINT
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result<std::string> b("niall");
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BOOST_CHECK(!strcmp(extended_error_info, "niall")); // NOLINT
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}
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//! [extended_error_coding2]
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namespace hook_test
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{
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// Localise outcome to using the local error_code so this namespace gets looked up for the hooks
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template <class R> using outcome = BOOST_OUTCOME_V2_NAMESPACE::outcome<R, error_code, std::string>;
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// Specialise the outcome copy and move conversion hook for our localised result
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template <class T, class U> constexpr inline void hook_outcome_copy_construction(outcome<T> *res, const result<U> & /*unused*/) noexcept
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{
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// when copy constructing from a result<T>, place extended_error_coding::extended_error_info into the payload
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std::cout << "hook_outcome_copy_construction fires" << std::endl;
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BOOST_OUTCOME_V2_NAMESPACE::hooks::override_outcome_exception(res, extended_error_info);
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}
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template <class T, class U> constexpr inline void hook_outcome_move_construction(outcome<T> *res, result<U> && /*unused*/) noexcept
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{
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// when move constructing from a result<T>, place extended_error_coding::extended_error_info into the payload
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std::cout << "hook_outcome_move_construction fires" << std::endl;
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BOOST_OUTCOME_V2_NAMESPACE::hooks::override_outcome_exception(res, extended_error_info);
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}
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} // namespace hook_test
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BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_hooks, "Tests that you can hook outcome's conversion from a result")
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{
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using namespace hook_test;
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outcome<int> a(result<int>(5));
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BOOST_REQUIRE(a.has_exception()); // NOLINT
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BOOST_CHECK(a.exception() == "5");
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outcome<std::string> b(result<std::string>("niall"));
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BOOST_CHECK(b.exception() == "niall");
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// Make sure hook does not fire for any other kind of outcome copy or move, only when converting from our custom result only
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outcome<int> c(5);
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outcome<long> d(c); // can't be the same type as source, else copy elision takes place and no ADL hook calling
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BOOST_CHECK(!d.has_exception());
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outcome<int> e(BOOST_OUTCOME_V2_NAMESPACE::result<int>(5));
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BOOST_CHECK(!e.has_exception());
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}
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