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- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_optional.reference.relnotes"></a><a class="link" href="relnotes.html" title="Release Notes">Release Notes</a>
- </h3></div></div></div>
- <h5>
- <a name="boost_optional.reference.relnotes.h0"></a>
- <span class="phrase"><a name="boost_optional.reference.relnotes.boost_release_x_xx"></a></span><a class="link" href="relnotes.html#boost_optional.reference.relnotes.boost_release_x_xx">Boost Release
- X.XX</a>
- </h5>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
- Now <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span></code> is specialized for reference
- parameters. This way the <code class="computeroutput"><span class="keyword">sizeof</span></code>
- of optional reference is that of a pointer, and a number of bugs is avoided.
- </li></ul></div>
- <h5>
- <a name="boost_optional.reference.relnotes.h1"></a>
- <span class="phrase"><a name="boost_optional.reference.relnotes.boost_release_1_60"></a></span><a class="link" href="relnotes.html#boost_optional.reference.relnotes.boost_release_1_60">Boost Release
- 1.60</a>
- </h5>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
- Changed the implementation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code>
- again. Now it is a const object with internal linkage (as any other tag).
- This fixes <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac
- #11203</a>.
- </li></ul></div>
- <h5>
- <a name="boost_optional.reference.relnotes.h2"></a>
- <span class="phrase"><a name="boost_optional.reference.relnotes.boost_release_1_59"></a></span><a class="link" href="relnotes.html#boost_optional.reference.relnotes.boost_release_1_59">Boost Release
- 1.59</a>
- </h5>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- For C++03 compilers, added 0-argument overload for member function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>,
- and therewith removed the dependency on <code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">utility</span><span class="special">/</span><span class="identifier">in_place_factory</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>.
- </li>
- <li class="listitem">
- Fixed <a href="https://svn.boost.org/trac/boost/ticket/11241" target="_top">Trac
- #11241</a>.
- </li>
- </ul></div>
- <h5>
- <a name="boost_optional.reference.relnotes.h3"></a>
- <span class="phrase"><a name="boost_optional.reference.relnotes.boost_release_1_58"></a></span><a class="link" href="relnotes.html#boost_optional.reference.relnotes.boost_release_1_58">Boost Release
- 1.58</a>
- </h5>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none_t</span></code> is no longer convertible from
- literal <code class="computeroutput"><span class="number">0</span></code>. This avoids a
- bug where <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">rational</span><span class="special"><</span><span class="keyword">int</span><span class="special">>></span>
- <span class="identifier">oi</span> <span class="special">=</span>
- <span class="number">0</span><span class="special">;</span></code>
- would initialize an optional object with no contained value.
- </li>
- <li class="listitem">
- Improved the trick that prevents streaming out <code class="computeroutput"><span class="identifier">optional</span></code>
- without header <code class="computeroutput"><span class="identifier">optional_io</span><span class="special">.</span><span class="identifier">hpp</span></code>
- by using safe-bool idiom. This addresses <a href="https://svn.boost.org/trac/boost/ticket/10825" target="_top">Trac
- #10825</a>.
- </li>
- <li class="listitem">
- IOStream operators are now mentioned in documentation.
- </li>
- <li class="listitem">
- Added a way to manually disable move semantics: just define macro <code class="computeroutput"><span class="identifier">BOOST_OPTIONAL_CONFIG_NO_RVALUE_REFERENCES</span></code>.
- This can be used to work around <a href="https://svn.boost.org/trac/boost/ticket/10399" target="_top">Trac
- #10399</a>.
- </li>
- <li class="listitem">
- It is no longer possible to assign <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">U</span><span class="special">></span></code> to <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> when <code class="computeroutput"><span class="identifier">U</span></code>
- is not assignable or convertible to <code class="computeroutput"><span class="identifier">T</span></code>
- (<a href="https://svn.boost.org/trac/boost/ticket/11087" target="_top">Trac #11087</a>).
- </li>
- <li class="listitem">
- Value accessors now work correctly on rvalues of <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">&></span></code> (<a href="https://svn.boost.org/trac/boost/ticket/10839" target="_top">Trac
- #10839</a>).
- </li>
- </ul></div>
- <h5>
- <a name="boost_optional.reference.relnotes.h4"></a>
- <span class="phrase"><a name="boost_optional.reference.relnotes.boost_release_1_57"></a></span><a class="link" href="relnotes.html#boost_optional.reference.relnotes.boost_release_1_57">Boost Release
- 1.57</a>
- </h5>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
- <a href="https://github.com/boostorg/optional/pull/9" target="_top">Git pull #9</a>:
- <span class="emphasis"><em>"Supply <code class="computeroutput"><span class="special"><</span><span class="identifier">string</span><span class="special">></span></code>
- to fix C++03 compile error on <code class="computeroutput"><span class="identifier">logic_error</span><span class="special">(</span><span class="string">"..."</span><span class="special">)</span></code>"</em></span>.
- </li></ul></div>
- <h5>
- <a name="boost_optional.reference.relnotes.h5"></a>
- <span class="phrase"><a name="boost_optional.reference.relnotes.boost_release_1_56"></a></span><a class="link" href="relnotes.html#boost_optional.reference.relnotes.boost_release_1_56">Boost Release
- 1.56</a>
- </h5>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- Added support for rvalue references. Now <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> works with moveable but non-copyable
- <code class="computeroutput"><span class="identifier">T</span></code>'s,
- </li>
- <li class="listitem">
- Improved <code class="computeroutput"><span class="identifier">swap</span></code> (now uses
- move operations),
- </li>
- <li class="listitem">
- Added function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>. This is the last of the requests from
- <a href="https://svn.boost.org/trac/boost/ticket/1841" target="_top">Trac #1841</a>,
- </li>
- <li class="listitem">
- <code class="computeroutput"><span class="identifier">optional</span></code> is moveable,
- including conditional <code class="computeroutput"><span class="keyword">noexcept</span></code>
- specifications, which make it <code class="computeroutput"><span class="identifier">move_if_noexcept</span></code>-friendly,
- </li>
- <li class="listitem">
- Using explicit operator bool() on platforms that support it (<a href="https://svn.boost.org/trac/boost/ticket/4227" target="_top">Trac
- #4227</a>) (breaking change),
- </li>
- <li class="listitem">
- Forward declaration of <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<(</span><span class="identifier">ostream</span><span class="special">&,</span> <span class="identifier">optional</span>
- <span class="keyword">const</span><span class="special">&)</span></code>
- to prevent inadvertent incorrect serialization of optional objects,
- </li>
- <li class="listitem">
- Removed deprecated function <code class="computeroutput"><span class="identifier">reset</span><span class="special">()</span></code> from examples (<a href="https://svn.boost.org/trac/boost/ticket/9005" target="_top">Trac
- #9005</a>),
- </li>
- <li class="listitem">
- Equality comparison with <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code>
- does not require that <code class="computeroutput"><span class="identifier">T</span></code>
- be EqualityComparable,
- </li>
- <li class="listitem">
- Optional rvalue references are explicitly disallowed,
- </li>
- <li class="listitem">
- Binding temporaries to optional references is explicitly disallowed (breaking
- change),
- </li>
- <li class="listitem">
- More ways to access the contained value, functions <code class="computeroutput"><span class="identifier">value</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">value_or</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">value_or_eval</span><span class="special">()</span></code>,
- </li>
- <li class="listitem">
- Updated and reorganized documentation, added tutorial and quick guide
- sections.
- </li>
- </ul></div>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2016 Andrzej Krzemieński<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
- </p>
- </div></td>
- </tr></table>
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