ceph/src/boost/libs/optional/doc/html/boost_optional/relnotes.html

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  25 <div class="section">
  26 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  27 <a name="boost_optional.relnotes"></a><a class="link" href="relnotes.html" title="Release Notes">Release Notes</a>
  28 </h2></div></div></div>
  29 <h4>
  30 <a name="boost_optional.relnotes.h0"></a>
  31       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_63"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_63">Boost
  32       Release 1.63</a>
  33     </h4>
  34 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  35 <li class="listitem">
  36           Added two new in-place constructors. They work similarly to <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>
  37           functions: they initialize the contained value by perfect-forwarding the
  38           obtained arguments. One constructor always initializes the contained value,
  39           the other based on a boolean condition.
  40         </li>
  41 <li class="listitem">
  42           Fixed <a href="https://svn.boost.org/trac/boost/ticket/12203" target="_top">Trac #12203</a>.
  43         </li>
  44 </ul></div>
  45 <h4>
  46 <a name="boost_optional.relnotes.h1"></a>
  47       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_62"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_62">Boost
  48       Release 1.62</a>
  49     </h4>
  50 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
  51           Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>.
  52         </li></ul></div>
  53 <h4>
  54 <a name="boost_optional.relnotes.h2"></a>
  55       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_61"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_61">Boost
  56       Release 1.61</a>
  57     </h4>
  58 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  59 <li class="listitem">
  60           Now <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span></code> is specialized for reference
  61           parameters. This addresses a couple of issues:
  62           <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
  63 <li class="listitem">
  64                 the <code class="computeroutput"><span class="keyword">sizeof</span></code> of optional
  65                 reference is that of a pointer,
  66               </li>
  67 <li class="listitem">
  68                 some bugs connected to copying optional references are gone,
  69               </li>
  70 <li class="listitem">
  71                 all run-time bugs caused by incorrect reference binding on some compilers
  72                 are now turned into compile-time errors,
  73               </li>
  74 <li class="listitem">
  75                 you can swap optional references: it is like swapping pointers: shalow,
  76                 underlying objects are not affected,
  77               </li>
  78 <li class="listitem">
  79                 optional references to abstract types work.
  80               </li>
  81 </ul></div>
  82         </li>
  83 <li class="listitem">
  84           Documented nested typedefs (<a href="https://svn.boost.org/trac/boost/ticket/5193" target="_top">Trac
  85           #5193</a>).
  86         </li>
  87 <li class="listitem">
  88           Made the perfect-forwarding constructor SFINAE-friendly, which fixes <a href="https://svn.boost.org/trac/boost/ticket/12002" target="_top">Trac #12002</a>.
  89           However, this only works in the newer platforms that correctly implement
  90           C++11 <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">type_traits</span><span class="special">&gt;</span></code>.
  91         </li>
  92 <li class="listitem">
  93           Fixed <a href="https://svn.boost.org/trac/boost/ticket/10445" target="_top">Trac #10445</a>.
  94         </li>
  95 </ul></div>
  96 <h4>
  97 <a name="boost_optional.relnotes.h3"></a>
  98       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_60"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_60">Boost
  99       Release 1.60</a>
 100     </h4>
 101 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 102           Changed the implementation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code>
 103           again. Now it is a const object with internal linkage (as any other tag).
 104           This fixes <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac
 105           #11203</a>.
 106         </li></ul></div>
 107 <h4>
 108 <a name="boost_optional.relnotes.h4"></a>
 109       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_59"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_59">Boost
 110       Release 1.59</a>
 111     </h4>
 112 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 113 <li class="listitem">
 114           For C++03 compilers, added 0-argument overload for member function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>,
 115           and therewith removed the dependency on <code class="computeroutput"><span class="special">&lt;</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">&gt;</span></code>.
 116         </li>
 117 <li class="listitem">
 118           Fixed <a href="https://svn.boost.org/trac/boost/ticket/11241" target="_top">Trac #11241</a>.
 119         </li>
 120 </ul></div>
 121 <h4>
 122 <a name="boost_optional.relnotes.h5"></a>
 123       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_58"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_58">Boost
 124       Release 1.58</a>
 125     </h4>
 126 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 127 <li class="listitem">
 128           <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none_t</span></code> is no longer convertible from
 129           literal <code class="computeroutput"><span class="number">0</span></code>. This avoids a bug
 130           where <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">rational</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;&gt;</span> <span class="identifier">oi</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span></code> would
 131           initialize an optional object with no contained value.
 132         </li>
 133 <li class="listitem">
 134           Improved the trick that prevents streaming out <code class="computeroutput"><span class="identifier">optional</span></code>
 135           without header <code class="computeroutput"><span class="identifier">optional_io</span><span class="special">.</span><span class="identifier">hpp</span></code>
 136           by using safe-bool idiom. This addresses <a href="https://svn.boost.org/trac/boost/ticket/10825" target="_top">Trac
 137           #10825</a>.
 138         </li>
 139 <li class="listitem">
 140           IOStream operators are now mentioned in documentation.
 141         </li>
 142 <li class="listitem">
 143           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>.
 144           This can be used to work around <a href="https://svn.boost.org/trac/boost/ticket/10399" target="_top">Trac
 145           #10399</a>.
 146         </li>
 147 <li class="listitem">
 148           It is no longer possible to assign <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;</span></code> to <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code> when <code class="computeroutput"><span class="identifier">U</span></code>
 149           is not assignable or convertible to <code class="computeroutput"><span class="identifier">T</span></code>
 150           (<a href="https://svn.boost.org/trac/boost/ticket/11087" target="_top">Trac #11087</a>).
 151         </li>
 152 <li class="listitem">
 153           Value accessors now work correctly on rvalues of <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;</span></code> (<a href="https://svn.boost.org/trac/boost/ticket/10839" target="_top">Trac
 154           #10839</a>).
 155         </li>
 156 </ul></div>
 157 <h4>
 158 <a name="boost_optional.relnotes.h6"></a>
 159       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_57"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_57">Boost
 160       Release 1.57</a>
 161     </h4>
 162 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 163           <a href="https://github.com/boostorg/optional/pull/9" target="_top">Git pull #9</a>:
 164           <span class="emphasis"><em>"Supply <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">string</span><span class="special">&gt;</span></code>
 165           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>.
 166         </li></ul></div>
 167 <h4>
 168 <a name="boost_optional.relnotes.h7"></a>
 169       <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_56"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_56">Boost
 170       Release 1.56</a>
 171     </h4>
 172 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 173 <li class="listitem">
 174           Added support for rvalue references. Now <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code> works with moveable but non-copyable
 175           <code class="computeroutput"><span class="identifier">T</span></code>'s,
 176         </li>
 177 <li class="listitem">
 178           Improved <code class="computeroutput"><span class="identifier">swap</span></code> (now uses
 179           move operations),
 180         </li>
 181 <li class="listitem">
 182           Added function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>. This is the last of the requests from
 183           <a href="https://svn.boost.org/trac/boost/ticket/1841" target="_top">Trac #1841</a>,
 184         </li>
 185 <li class="listitem">
 186           <code class="computeroutput"><span class="identifier">optional</span></code> is moveable, including
 187           conditional <code class="computeroutput"><span class="keyword">noexcept</span></code> specifications,
 188           which make it <code class="computeroutput"><span class="identifier">move_if_noexcept</span></code>-friendly,
 189         </li>
 190 <li class="listitem">
 191           Using explicit operator bool() on platforms that support it (<a href="https://svn.boost.org/trac/boost/ticket/4227" target="_top">Trac
 192           #4227</a>) (breaking change),
 193         </li>
 194 <li class="listitem">
 195           Forward declaration of <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">ostream</span><span class="special">&amp;,</span> <span class="identifier">optional</span>
 196           <span class="keyword">const</span><span class="special">&amp;)</span></code>
 197           to prevent inadvertent incorrect serialization of optional objects,
 198         </li>
 199 <li class="listitem">
 200           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
 201           #9005</a>),
 202         </li>
 203 <li class="listitem">
 204           Equality comparison with <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code>
 205           does not require that <code class="computeroutput"><span class="identifier">T</span></code>
 206           be EqualityComparable,
 207         </li>
 208 <li class="listitem">
 209           Optional rvalue references are explicitly disallowed,
 210         </li>
 211 <li class="listitem">
 212           Binding temporaries to optional references is explicitly disallowed (breaking
 213           change),
 214         </li>
 215 <li class="listitem">
 216           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>,
 217         </li>
 218 <li class="listitem">
 219           Updated and reorganized documentation, added tutorial and quick guide sections.
 220         </li>
 221 </ul></div>
 222 </div>
 223 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 224 <td align="left"></td>
 225 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright &#169; 2014-2016 Andrzej Krzemie&#324;ski<p>
 226         Distributed under the Boost Software License, Version 1.0. (See accompanying
 227         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>)
 228       </p>
 229 </div></td>
 230 </tr></table>
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