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| <div class="section"> |
| <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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