1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 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 V1.79.1"> 7<link rel="home" href="../index.html" title="Boost.Optional"> 8<link rel="up" href="../index.html" title="Boost.Optional"> 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="../index.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><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_73"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_73">Boost 32 Release 1.73</a> 33 </h4> 34<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 35<li class="listitem"> 36 Fixed <a href="https://github.com/boostorg/optional/issues/78" target="_top">issue 37 #78</a>. 38 </li> 39<li class="listitem"> 40 <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> is now declared as an inline variable 41 (on compilers taht support it): there is only one instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> across all translation units. 42 </li> 43<li class="listitem"> 44 Fixed a number of compilation errors in GCC 4.4.7 in <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> for trivial <code class="computeroutput"><span class="identifier">T</span></code>s. 45 Thanks to Robert Leahy for the fix. For details see <a href="https://github.com/boostorg/optional/pull/80" target="_top">pr 46 #78</a>. 47 </li> 48<li class="listitem"> 49 Now surpressing warning <code class="computeroutput"><span class="special">-</span><span class="identifier">Wweak</span><span class="special">-</span><span class="identifier">vtables</span></code>. 50 </li> 51</ul></div> 52<h4> 53<a name="boost_optional.relnotes.h1"></a> 54 <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_69"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_69">Boost 55 Release 1.69</a> 56 </h4> 57<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 58<li class="listitem"> 59 Remove deprecation mark from <code class="computeroutput"><span class="identifier">reset</span><span class="special">()</span></code> method (without arguments). 60 </li> 61<li class="listitem"> 62 Fixed <a href="https://github.com/boostorg/optional/issues/59" target="_top">issue 63 #59</a>. 64 </li> 65<li class="listitem"> 66 Fixed bug with initialization of certain wrapper types in clang with -std=c++03. 67 See <a href="https://github.com/boostorg/optional/pull/64" target="_top">pr #64</a>. 68 </li> 69</ul></div> 70<h4> 71<a name="boost_optional.relnotes.h2"></a> 72 <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_68"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_68">Boost 73 Release 1.68</a> 74 </h4> 75<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 76<li class="listitem"> 77 Added member function <code class="computeroutput"><span class="identifier">has_value</span><span class="special">()</span></code> for compatibility with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">optional</span></code> (<a href="https://github.com/boostorg/optional/issues/52" target="_top">issue 78 #52</a>). 79 </li> 80<li class="listitem"> 81 Added member function <code class="computeroutput"><span class="identifier">map</span><span class="special">()</span></code> for transforming <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> into <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">U</span><span class="special">></span></code> using a function of type <code class="computeroutput"><span class="identifier">T</span> <span class="special">-></span> <span class="identifier">U</span></code>. 82 </li> 83<li class="listitem"> 84 Added member function <code class="computeroutput"><span class="identifier">flat_map</span><span class="special">()</span></code> for transforming <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> into <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">U</span><span class="special">></span></code> using a function of type <code class="computeroutput"><span class="identifier">T</span> <span class="special">-></span> <span class="identifier">optonal</span><span class="special"><</span><span class="identifier">U</span><span class="special">></span></code>. 85 </li> 86</ul></div> 87<h4> 88<a name="boost_optional.relnotes.h3"></a> 89 <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_67"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_67">Boost 90 Release 1.67</a> 91 </h4> 92<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 93<li class="listitem"> 94 Fixed <a href="https://github.com/boostorg/optional/issues/46" target="_top">issue 95 #46</a>. 96 </li> 97<li class="listitem"> 98 Fixed <code class="computeroutput"><span class="special">-</span><span class="identifier">Wzero</span><span class="special">-</span><span class="identifier">as</span><span class="special">-</span><span class="identifier">null</span><span class="special">-</span><span class="identifier">pointer</span><span class="special">-</span><span class="identifier">constant</span></code> warnings. 99 </li> 100</ul></div> 101<h4> 102<a name="boost_optional.relnotes.h4"></a> 103 <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_66"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_66">Boost 104 Release 1.66</a> 105 </h4> 106<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 107<li class="listitem"> 108 On newer compilers <code class="computeroutput"><span class="identifier">optional</span></code> 109 is now trivially-copyable for scalar <code class="computeroutput"><span class="identifier">T</span></code>s. 110 This uses a different storage (just <code class="computeroutput"><span class="identifier">T</span></code> 111 rather than <code class="computeroutput"><span class="identifier">aligned_storage</span></code>). 112 We require the compiler to support defaulted functions. 113 </li> 114<li class="listitem"> 115 Changed the implementation of <code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code> to get rid of the <code class="computeroutput"><span class="special">-</span><span class="identifier">Wmaybe</span><span class="special">-</span><span class="identifier">uninitialized</span></code> false-positive warning 116 from GCC. 117 </li> 118</ul></div> 119<h4> 120<a name="boost_optional.relnotes.h5"></a> 121 <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 122 Release 1.63</a> 123 </h4> 124<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 125<li class="listitem"> 126 Added two new in-place constructors. They work similarly to <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code> 127 functions: they initialize the contained value by perfect-forwarding the 128 obtained arguments. One constructor always initializes the contained value, 129 the other based on a boolean condition. 130 </li> 131<li class="listitem"> 132 Syntax <code class="computeroutput"><span class="identifier">o</span> <span class="special">=</span> 133 <span class="special">{}</span></code> now correctly un-initializes 134 optional, just like in <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">optional</span></code>. 135 </li> 136<li class="listitem"> 137 Fixed <a href="https://svn.boost.org/trac/boost/ticket/12203" target="_top">Trac #12203</a>. 138 </li> 139<li class="listitem"> 140 Fixed <a href="https://svn.boost.org/trac/boost/ticket/12563" target="_top">Trac #12563</a>. 141 </li> 142</ul></div> 143<h4> 144<a name="boost_optional.relnotes.h6"></a> 145 <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 146 Release 1.62</a> 147 </h4> 148<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 149 Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>. 150 </li></ul></div> 151<h4> 152<a name="boost_optional.relnotes.h7"></a> 153 <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 154 Release 1.61</a> 155 </h4> 156<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 157<li class="listitem"> 158 Now <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span></code> is specialized for reference 159 parameters. This addresses a couple of issues: 160 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "> 161<li class="listitem"> 162 the <code class="computeroutput"><span class="keyword">sizeof</span></code> of optional 163 reference is that of a pointer, 164 </li> 165<li class="listitem"> 166 some bugs connected to copying optional references are gone, 167 </li> 168<li class="listitem"> 169 all run-time bugs caused by incorrect reference binding on some compilers 170 are now turned into compile-time errors, 171 </li> 172<li class="listitem"> 173 you can swap optional references: it is like swapping pointers: shalow, 174 underlying objects are not affected, 175 </li> 176<li class="listitem"> 177 optional references to abstract types work. 178 </li> 179</ul></div> 180 </li> 181<li class="listitem"> 182 Documented nested typedefs (<a href="https://svn.boost.org/trac/boost/ticket/5193" target="_top">Trac 183 #5193</a>). 184 </li> 185<li class="listitem"> 186 Made the perfect-forwarding constructor SFINAE-friendly, which fixes <a href="https://svn.boost.org/trac/boost/ticket/12002" target="_top">Trac #12002</a>. 187 However, this only works in the newer platforms that correctly implement 188 C++11 <code class="computeroutput"><span class="special"><</span><span class="identifier">type_traits</span><span class="special">></span></code>. 189 </li> 190<li class="listitem"> 191 Fixed <a href="https://svn.boost.org/trac/boost/ticket/10445" target="_top">Trac #10445</a>. 192 </li> 193</ul></div> 194<h4> 195<a name="boost_optional.relnotes.h8"></a> 196 <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 197 Release 1.60</a> 198 </h4> 199<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 200 Changed the implementation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> 201 again. Now it is a const object with internal linkage (as any other tag). 202 This fixes <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac 203 #11203</a>. 204 </li></ul></div> 205<h4> 206<a name="boost_optional.relnotes.h9"></a> 207 <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 208 Release 1.59</a> 209 </h4> 210<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 211<li class="listitem"> 212 For C++03 compilers, added 0-argument overload for member function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>, 213 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>. 214 </li> 215<li class="listitem"> 216 Fixed <a href="https://svn.boost.org/trac/boost/ticket/11241" target="_top">Trac #11241</a>. 217 </li> 218</ul></div> 219<h4> 220<a name="boost_optional.relnotes.h10"></a> 221 <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 222 Release 1.58</a> 223 </h4> 224<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 225<li class="listitem"> 226 <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none_t</span></code> is no longer convertible from 227 literal <code class="computeroutput"><span class="number">0</span></code>. This avoids a bug 228 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 229 initialize an optional object with no contained value. 230 </li> 231<li class="listitem"> 232 Improved the trick that prevents streaming out <code class="computeroutput"><span class="identifier">optional</span></code> 233 without header <code class="computeroutput"><span class="identifier">optional_io</span><span class="special">.</span><span class="identifier">hpp</span></code> 234 by using safe-bool idiom. This addresses <a href="https://svn.boost.org/trac/boost/ticket/10825" target="_top">Trac 235 #10825</a>. 236 </li> 237<li class="listitem"> 238 IOStream operators are now mentioned in documentation. 239 </li> 240<li class="listitem"> 241 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>. 242 This can be used to work around <a href="https://svn.boost.org/trac/boost/ticket/10399" target="_top">Trac 243 #10399</a>. 244 </li> 245<li class="listitem"> 246 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> 247 is not assignable or convertible to <code class="computeroutput"><span class="identifier">T</span></code> 248 (<a href="https://svn.boost.org/trac/boost/ticket/11087" target="_top">Trac #11087</a>). 249 </li> 250<li class="listitem"> 251 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 252 #10839</a>). 253 </li> 254</ul></div> 255<h4> 256<a name="boost_optional.relnotes.h11"></a> 257 <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 258 Release 1.57</a> 259 </h4> 260<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 261 <a href="https://github.com/boostorg/optional/pull/9" target="_top">Git pull #9</a>: 262 <span class="emphasis"><em>"Supply <code class="computeroutput"><span class="special"><</span><span class="identifier">string</span><span class="special">></span></code> 263 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>. 264 </li></ul></div> 265<h4> 266<a name="boost_optional.relnotes.h12"></a> 267 <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 268 Release 1.56</a> 269 </h4> 270<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 271<li class="listitem"> 272 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 273 <code class="computeroutput"><span class="identifier">T</span></code>'s, 274 </li> 275<li class="listitem"> 276 Improved <code class="computeroutput"><span class="identifier">swap</span></code> (now uses 277 move operations), 278 </li> 279<li class="listitem"> 280 Added function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>. This is the last of the requests from 281 <a href="https://svn.boost.org/trac/boost/ticket/1841" target="_top">Trac #1841</a>, 282 </li> 283<li class="listitem"> 284 <code class="computeroutput"><span class="identifier">optional</span></code> is moveable, including 285 conditional <code class="computeroutput"><span class="keyword">noexcept</span></code> specifications, 286 which make it <code class="computeroutput"><span class="identifier">move_if_noexcept</span></code>-friendly, 287 </li> 288<li class="listitem"> 289 Using explicit operator bool() on platforms that support it (<a href="https://svn.boost.org/trac/boost/ticket/4227" target="_top">Trac 290 #4227</a>) (breaking change), 291 </li> 292<li class="listitem"> 293 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> 294 <span class="keyword">const</span><span class="special">&)</span></code> 295 to prevent inadvertent incorrect serialization of optional objects, 296 </li> 297<li class="listitem"> 298 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 299 #9005</a>), 300 </li> 301<li class="listitem"> 302 Equality comparison with <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span></code> 303 does not require that <code class="computeroutput"><span class="identifier">T</span></code> 304 be EqualityComparable, 305 </li> 306<li class="listitem"> 307 Optional rvalue references are explicitly disallowed, 308 </li> 309<li class="listitem"> 310 Binding temporaries to optional references is explicitly disallowed (breaking 311 change), 312 </li> 313<li class="listitem"> 314 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>, 315 </li> 316<li class="listitem"> 317 Updated and reorganized documentation, added tutorial and quick guide sections. 318 </li> 319</ul></div> 320</div> 321<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 322<td align="left"></td> 323<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2018 Andrzej Krzemieński<p> 324 Distributed under the Boost Software License, Version 1.0. (See accompanying 325 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>) 326 </p> 327</div></td> 328</tr></table> 329<hr> 330<div class="spirit-nav"> 331<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="../index.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> 332</div> 333</body> 334</html> 335
