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- /* Unit testing for outcomes
- (C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (7 commits)
- 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.
- */
- #define _CRT_SECURE_NO_WARNINGS
- #include <boost/outcome.hpp>
- #include <boost/test/unit_test.hpp>
- #include <boost/test/unit_test_monitor.hpp>
- #ifndef BOOST_NO_EXCEPTIONS
- #ifdef _MSC_VER
- #define BOOST_OUTCOME_POSIX_OPEN ::_open
- #include <io.h>
- #else
- #define BOOST_OUTCOME_POSIX_OPEN ::open
- #include <fcntl.h>
- #endif
- BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_fileopen, "Tests that the outcome semantically represents opening a file")
- {
- using namespace BOOST_OUTCOME_V2_NAMESPACE;
- //! [file_open_example]
- auto openfile = [](std::string path) noexcept->outcome<int>
- {
- int fd;
- do
- {
- fd = BOOST_OUTCOME_POSIX_OPEN(path.c_str(), 0); // NOLINT
- } while(-1 == fd && EINTR == errno);
- try
- {
- if(-1 == fd)
- {
- int code = errno;
- // If a temporary failure, this is an expected unexpected outcome
- if(EBUSY == code || EISDIR == code || ELOOP == code || ENOENT == code || ENOTDIR == code || EPERM == code || EACCES == code)
- {
- return boost::system::error_code(code, boost::system::generic_category());
- }
- // If a non-temporary failure, this is an unexpected outcome
- return boost::copy_exception(boost::system::system_error(code, boost::system::generic_category(), strerror(code)));
- }
- return fd;
- }
- catch(...)
- {
- // Any exception thrown is truly unexpected
- return boost::current_exception();
- }
- };
- auto a = openfile("shouldneverexistnotever");
- BOOST_CHECK(!a);
- BOOST_CHECK(!a.has_value());
- BOOST_CHECK(!a.has_exception());
- BOOST_CHECK(a.has_error());
- BOOST_CHECK(a.error() == boost::system::error_code(ENOENT, boost::system::generic_category()));
- //! [file_open_example]
- }
- #endif
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