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