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<div class="titlepage"><div><div><h1 style="clear: both">Changelog</h1></div></div></div>
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<hr />
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<h2 id="v2-1-1-xxth-july-2019-boost-1-71-release-https-github-com-ned14-outcome-releases-tag-v2-1-1">v2.1.1 XXth July 2019 (Boost 1.71) <a href="https://github.com/ned14/outcome/releases/tag/v2.1.1">[release]</a></h2>
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<h3 id="enhancements">Enhancements:</h3>
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<dl>
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<dt><a href="https://github.com/ned14/outcome/issues/184">#184</a></dt>
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<dd>As per request from Boost release managers, relocated <code>version.hpp</code> and
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<code>revision.hpp</code> into detail, and added the Boost licence boilerplate to the top
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of every source file which was missing one (I think). Also took the opportunity
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to run the licence restamping script over all Outcome, so copyright dates are now
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up to date.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/185">#185</a></dt>
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<dd>Add FAQ item explaining issue #185, and why we will do nothing to
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fix it right now.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/189">#189</a></dt>
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<dd>Refactored the <code>BOOST_OUTCOME_TRY</code> implementation to use more clarified
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customisation points capable of accepting very foreign inputs. Removed the
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<code>std::experimental::expected<T, E></code> specialisations, as those are no longer
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necessary. Fixed the documentation for the customisation points which
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previously claimed that they are ADL discovered, which they are not. Added
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a recipe describing how to add in support for foreign input types.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/183">#183</a></dt>
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<dd>Added a separate <code>motivation/plug_error_code</code> specifically for Boost.</dd>
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</dl>
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<h3 id="bug-fixes">Bug fixes:</h3>
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<dl>
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<dt>-</dt>
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<dd><code>BOOST_OUTCOME_VERSION_MINOR</code> hadn’t been updated to 1.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/181">#181</a></dt>
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<dd>Fix issue #181 where Outcome didn’t actually implement the strong swap guarantee,
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despite being documented as doing so.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/190">#190</a></dt>
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<dd>Fix issue #190 in Boost edition where unit test suite was not runnable from
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the Boost release distro.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/182">#182</a></dt>
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<dd>Fix issue #182 where <code>trait::is_exception_ptr_available<T></code> was always true,
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thus causing much weirdness, like not printing diagnostics and trying to feed
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everything to <code>make_exception_ptr()</code>.</dd>
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<dt><a href="https://github.com/ned14/outcome/issues/192">#194</a></dt>
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<dd>Fix issue #192 where the <code>std::basic_outcome_failure_exception_from_error()</code>
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was being defined twice for translation units which combine standalone and
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Boost Outcome’s.</dd>
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</dl>
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<hr />
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<h2 id="v2-1-12th-apr-2019-boost-1-70-release-https-github-com-ned14-outcome-releases-tag-v2-1">v2.1 12th Apr 2019 (Boost 1.70) <a href="https://github.com/ned14/outcome/releases/tag/v2.1">[release]</a></h2>
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<ul>
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<li><p><a href="https://github.com/ned14/outcome/issues/180">#180</a></p>
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<ul>
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<li><code>success()</code> and <code>failure()</code> now produce types marked <code>[[nodiscard]]</code>.</li>
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</ul></li>
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<li><p><code>include/outcome/outcome.natvis</code> is now namespace permuted like the rest of
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Outcome, so debugging Outcome based code in Visual Studio should look much
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prettier than before.</p></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/162">#162</a></p>
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<ul>
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<li><code>.has_failure()</code> was returning false at times when it should have returned true.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/152">#152</a></p>
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<ul>
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<li>GCC 5 no longer can compile Outcome at all due to <a href="https://stackoverflow.com/questions/45607450/gcc5-nested-variable-template-is-not-a-function-template">https://stackoverflow.com/questions/45607450/gcc5-nested-variable-template-is-not-a-function-template</a>.
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Added explicit version trap for GCC 5 to say it can not work. Note this is not a
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breaking change, GCC 5 was never supported officially in any v2 Outcome.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/150">#150</a></p>
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<ul>
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<li><strong>BREAKING CHANGE</strong> <code>result<T, E></code>, <code>boost_result<T, E></code> and <code>std_result<T, E></code>
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no longer implement hard UB on fetching a value from a valueless instance if <code>E</code> is
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a UDT, they now fail to compile with a useful error message. If you wish hard UB,
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use <code>unchecked<T, E></code>, <code>boost_unchecked<T, E></code> or <code>std_unchecked<T, E></code> instead.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/140">#140</a></p>
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<ul>
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<li>Fixed a nasty corner case bug where value type’s without a copy constructor
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but with a move constructor would indicate via traits that copy construction
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was available. Thanks to Microsoft’s compiler team for reporting this issue.</li>
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</ul></li>
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<li><p>Added experimental <code>status_result</code> and <code>status_outcome</code> based on experimental
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<code>status_code</code>.</p></li>
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<li><p>Boost edition is now 100% Boost, so defaults for <code>result</code> and <code>outcome</code> are
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<code>boost::system::error_code::errc_t</code> and <code>boost::exception_ptr</code>. Moreover,
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the test suite in the Boost edition now exclusively tests the Boost edition.
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One can, of course, freely use the standalone edition with Boost, and the Boost
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edition with <code>std</code> types.</p></li>
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<li><p>Renamed ADL discovered customisation point <code>throw_as_system_error_with_payload()</code>
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to <code>outcome_throw_as_system_error_with_payload()</code>.</p></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/135">#135</a></p>
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<ul>
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<li>Added much clearer compile failure when user tries <code>result<T, T></code> or <code>outcome</code>
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where two or more types are identical. Thanks to Andrzej Krzemieński
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for suggesting a technique which combines SFINAE correctness with
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the remaining ability for <code>result<T, T></code> etc to be a valid type, but
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not constructible.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/67">#67</a></p>
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<ul>
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<li>Fixed one of the oldest long open bugs in Outcome, that the noexcept
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unit tests failed on OS X for an unknown reason.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/115">#115</a></p>
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<ul>
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<li>Outcome did not construct correctly from <code>failure_type</code>.</li>
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</ul></li>
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<li><p>Inexplicably outcome’s error + exception constructor had been removed.
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Nobody noticed during the Boost peer review, which is worrying seeing as that
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constructor is needed for one of the main advertised features to Boost!</p></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/107">#107</a> and <a href="https://github.com/ned14/outcome/issues/116">#116</a></p>
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<ul>
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<li><code>operator==</code> and <code>operator!=</code> now become disabled if the value, error and
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exception types do not implement the same operator.</li>
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<li>Relatedly, both comparison operators simply didn’t work right. Fixed.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/109">#109</a></p>
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<ul>
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<li><code>swap()</code> now has correct <code>noexcept</code> calculation and now correctly orders
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the swaps to be whichever is the throwing swap first.</li>
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</ul></li>
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<li><p>Added reference dump of v2.1 ABI so we can check if ABI breakage detection
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works in the next set of changes, plus Travis job to check ABI and API compatibility
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per commit.</p></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/124">#124</a></p>
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<ul>
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<li><code>BOOST_OUTCOME_TRY</code> is now overloaded and selects <code>void</code> or <code>auto</code> edition
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according to input parameter count.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/120">#120</a></p>
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<ul>
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<li>Fix generation of double underscored temporary variables in
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<code>BOOST_OUTCOME_UNIQUE_NAME</code>, which is UB.</li>
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</ul></li>
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<li><p><a href="https://github.com/ned14/outcome/issues/110">#110</a></p>
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<ul>
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<li>Separated <code>result</code> from its hard coded dependency on the <code><system_error></code> header.</li>
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<li>Renamed <code>result</code> and <code>outcome</code> to <code>basic_result</code> and <code>basic_outcome</code>.</li>
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<li>Renamed <code>result.hpp</code> into <code>basic_result.hpp</code>.</li>
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<li>Moved <code><system_error></code> and <code><exception></code> dependent code into new
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<code>std_result.hpp</code> and <code>std_outcome.hpp</code> header files.</li>
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<li>Added <code>boost_result.hpp</code> and <code>boost_outcome.hpp</code> which use Boost.System
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and Boost.Exception (these are <code>result.hpp</code> and <code>outcome.hpp</code> in the Boost edition).</li>
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</ul></li>
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</ul>
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<hr />
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<h2 id="v2-0-18th-jan-2018-release-https-github-com-ned14-outcome-releases-tag-v2-0-boost-peer-review">v2.0 18th Jan 2018 <a href="https://github.com/ned14/outcome/releases/tag/v2.0-boost-peer-review">[release]</a></h2>
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<ul>
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<li>Boost peer review edition. This is what was reviewed.</li>
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<li>Changelog from v1 can be found in the release notes for this release.</li>
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</ul>
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</div><p><small>Last revised: June 25, 2019 at 17:01:21 +0100</small></p>
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