1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 4<title>Release Notes</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> 7<link rel="home" href="../../index.html" title="Boost.Optional"> 8<link rel="up" href="../../optional/reference.html" title="Reference"> 9<link rel="prev" href="dependencies_and_portability/optional_reference_binding.html" title="Optional Reference Binding"> 10<link rel="next" href="acknowledgements.html" title="Acknowledgements"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="dependencies_and_portability/optional_reference_binding.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../optional/reference.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="acknowledgements.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_optional.reference.relnotes"></a><a class="link" href="relnotes.html" title="Release Notes">Release Notes</a> 28</h3></div></div></div> 29<h5> 30<a name="boost_optional.reference.relnotes.h0"></a> 31 <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 32 X.XX</a> 33 </h5> 34<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 35 Now <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span></code> is specialized for reference 36 parameters. This way the <code class="computeroutput"><span class="keyword">sizeof</span></code> 37 of optional reference is that of a pointer, and a number of bugs is avoided. 38 </li></ul></div> 39<h5> 40<a name="boost_optional.reference.relnotes.h1"></a> 41 <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 42 1.60</a> 43 </h5> 44<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 45 Changed the implementation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> 46 again. Now it is a const object with internal linkage (as any other tag). 47 This fixes <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac 48 #11203</a>. 49 </li></ul></div> 50<h5> 51<a name="boost_optional.reference.relnotes.h2"></a> 52 <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 53 1.59</a> 54 </h5> 55<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 56<li class="listitem"> 57 For C++03 compilers, added 0-argument overload for member function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>, 58 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>. 59 </li> 60<li class="listitem"> 61 Fixed <a href="https://svn.boost.org/trac/boost/ticket/11241" target="_top">Trac 62 #11241</a>. 63 </li> 64</ul></div> 65<h5> 66<a name="boost_optional.reference.relnotes.h3"></a> 67 <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 68 1.58</a> 69 </h5> 70<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 71<li class="listitem"> 72 <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none_t</span></code> is no longer convertible from 73 literal <code class="computeroutput"><span class="number">0</span></code>. This avoids a 74 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> 75 <span class="identifier">oi</span> <span class="special">=</span> 76 <span class="number">0</span><span class="special">;</span></code> 77 would initialize an optional object with no contained value. 78 </li> 79<li class="listitem"> 80 Improved the trick that prevents streaming out <code class="computeroutput"><span class="identifier">optional</span></code> 81 without header <code class="computeroutput"><span class="identifier">optional_io</span><span class="special">.</span><span class="identifier">hpp</span></code> 82 by using safe-bool idiom. This addresses <a href="https://svn.boost.org/trac/boost/ticket/10825" target="_top">Trac 83 #10825</a>. 84 </li> 85<li class="listitem"> 86 IOStream operators are now mentioned in documentation. 87 </li> 88<li class="listitem"> 89 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>. 90 This can be used to work around <a href="https://svn.boost.org/trac/boost/ticket/10399" target="_top">Trac 91 #10399</a>. 92 </li> 93<li class="listitem"> 94 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> 95 is not assignable or convertible to <code class="computeroutput"><span class="identifier">T</span></code> 96 (<a href="https://svn.boost.org/trac/boost/ticket/11087" target="_top">Trac #11087</a>). 97 </li> 98<li class="listitem"> 99 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 100 #10839</a>). 101 </li> 102</ul></div> 103<h5> 104<a name="boost_optional.reference.relnotes.h4"></a> 105 <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 106 1.57</a> 107 </h5> 108<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 109 <a href="https://github.com/boostorg/optional/pull/9" target="_top">Git pull #9</a>: 110 <span class="emphasis"><em>"Supply <code class="computeroutput"><span class="special"><</span><span class="identifier">string</span><span class="special">></span></code> 111 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>. 112 </li></ul></div> 113<h5> 114<a name="boost_optional.reference.relnotes.h5"></a> 115 <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 116 1.56</a> 117 </h5> 118<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 119<li class="listitem"> 120 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 121 <code class="computeroutput"><span class="identifier">T</span></code>'s, 122 </li> 123<li class="listitem"> 124 Improved <code class="computeroutput"><span class="identifier">swap</span></code> (now uses 125 move operations), 126 </li> 127<li class="listitem"> 128 Added function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>. This is the last of the requests from 129 <a href="https://svn.boost.org/trac/boost/ticket/1841" target="_top">Trac #1841</a>, 130 </li> 131<li class="listitem"> 132 <code class="computeroutput"><span class="identifier">optional</span></code> is moveable, 133 including conditional <code class="computeroutput"><span class="keyword">noexcept</span></code> 134 specifications, which make it <code class="computeroutput"><span class="identifier">move_if_noexcept</span></code>-friendly, 135 </li> 136<li class="listitem"> 137 Using explicit operator bool() on platforms that support it (<a href="https://svn.boost.org/trac/boost/ticket/4227" target="_top">Trac 138 #4227</a>) (breaking change), 139 </li> 140<li class="listitem"> 141 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> 142 <span class="keyword">const</span><span class="special">&)</span></code> 143 to prevent inadvertent incorrect serialization of optional objects, 144 </li> 145<li class="listitem"> 146 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 147 #9005</a>), 148 </li> 149<li class="listitem"> 150 Equality comparison with <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> 151 does not require that <code class="computeroutput"><span class="identifier">T</span></code> 152 be EqualityComparable, 153 </li> 154<li class="listitem"> 155 Optional rvalue references are explicitly disallowed, 156 </li> 157<li class="listitem"> 158 Binding temporaries to optional references is explicitly disallowed (breaking 159 change), 160 </li> 161<li class="listitem"> 162 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>, 163 </li> 164<li class="listitem"> 165 Updated and reorganized documentation, added tutorial and quick guide 166 sections. 167 </li> 168</ul></div> 169</div> 170<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 171<td align="left"></td> 172<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2016 Andrzej Krzemieński<p> 173 Distributed under the Boost Software License, Version 1.0. (See accompanying 174 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>) 175 </p> 176</div></td> 177</tr></table> 178<hr> 179<div class="spirit-nav"> 180<a accesskey="p" href="dependencies_and_portability/optional_reference_binding.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../optional/reference.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="acknowledgements.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 181</div> 182</body> 183</html> 184
