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</div>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_optional.relnotes"></a><a class="link" href="relnotes.html" title="Release Notes">Release Notes</a>
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</h2></div></div></div>
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<h4>
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<a name="boost_optional.relnotes.h0"></a>
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<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
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Release 1.69</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Remove deprecation mark from <code class="computeroutput"><span class="identifier">reset</span><span class="special">()</span></code> method (without arguments).
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</li>
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<li class="listitem">
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Fixed <a href="https://github.com/boostorg/optional/issues/59" target="_top">issue
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#59</a>.
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</li>
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<li class="listitem">
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Fixed bug with initialization of certain wrapper types in clang with -std=c++03.
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See <a href="https://github.com/boostorg/optional/pull/64" target="_top">pr #64</a>.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h1"></a>
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<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
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Release 1.68</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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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
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#52</a>).
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</li>
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<li class="listitem">
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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>.
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</li>
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<li class="listitem">
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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>.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h2"></a>
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<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
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Release 1.67</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Fixed <a href="https://github.com/boostorg/optional/issues/46" target="_top">issue
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#46</a>.
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</li>
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<li class="listitem">
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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.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h3"></a>
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<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
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Release 1.66</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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On newer compilers <code class="computeroutput"><span class="identifier">optional</span></code>
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is now trivially-copyable for scalar <code class="computeroutput"><span class="identifier">T</span></code>s.
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This uses a different storage (just <code class="computeroutput"><span class="identifier">T</span></code>
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rather than <code class="computeroutput"><span class="identifier">aligned_storage</span></code>).
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We require the compiler to support defaulted functions.
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</li>
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<li class="listitem">
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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
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from GCC.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h4"></a>
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<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
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Release 1.63</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Added two new in-place constructors. They work similarly to <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>
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functions: they initialize the contained value by perfect-forwarding the
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obtained arguments. One constructor always initializes the contained value,
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the other based on a boolean condition.
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</li>
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<li class="listitem">
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Syntax <code class="computeroutput"><span class="identifier">o</span> <span class="special">=</span>
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<span class="special">{}</span></code> now correctly un-initializes
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optional, just like in <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">optional</span></code>.
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</li>
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<li class="listitem">
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Fixed <a href="https://svn.boost.org/trac/boost/ticket/12203" target="_top">Trac #12203</a>.
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</li>
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<li class="listitem">
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Fixed <a href="https://svn.boost.org/trac/boost/ticket/12563" target="_top">Trac #12563</a>.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h5"></a>
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<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
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Release 1.62</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
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Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>.
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</li></ul></div>
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<h4>
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<a name="boost_optional.relnotes.h6"></a>
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<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
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Release 1.61</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Now <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span></code> is specialized for reference
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parameters. This addresses a couple of issues:
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
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<li class="listitem">
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the <code class="computeroutput"><span class="keyword">sizeof</span></code> of optional
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reference is that of a pointer,
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</li>
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<li class="listitem">
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some bugs connected to copying optional references are gone,
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</li>
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<li class="listitem">
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all run-time bugs caused by incorrect reference binding on some compilers
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are now turned into compile-time errors,
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</li>
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<li class="listitem">
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you can swap optional references: it is like swapping pointers: shalow,
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underlying objects are not affected,
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</li>
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<li class="listitem">
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optional references to abstract types work.
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</li>
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</ul></div>
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</li>
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<li class="listitem">
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Documented nested typedefs (<a href="https://svn.boost.org/trac/boost/ticket/5193" target="_top">Trac
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#5193</a>).
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</li>
|
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<li class="listitem">
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Made the perfect-forwarding constructor SFINAE-friendly, which fixes <a href="https://svn.boost.org/trac/boost/ticket/12002" target="_top">Trac #12002</a>.
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However, this only works in the newer platforms that correctly implement
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C++11 <code class="computeroutput"><span class="special"><</span><span class="identifier">type_traits</span><span class="special">></span></code>.
|
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</li>
|
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<li class="listitem">
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Fixed <a href="https://svn.boost.org/trac/boost/ticket/10445" target="_top">Trac #10445</a>.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h7"></a>
|
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<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
|
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Release 1.60</a>
|
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</h4>
|
|
<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>
|
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again. Now it is a const object with internal linkage (as any other tag).
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This fixes <a href="https://svn.boost.org/trac/boost/ticket/11203" target="_top">Trac
|
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#11203</a>.
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</li></ul></div>
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<h4>
|
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<a name="boost_optional.relnotes.h8"></a>
|
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<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
|
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Release 1.59</a>
|
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</h4>
|
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
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<li class="listitem">
|
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For C++03 compilers, added 0-argument overload for member function <code class="computeroutput"><span class="identifier">emplace</span><span class="special">()</span></code>,
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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>.
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</li>
|
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<li class="listitem">
|
|
Fixed <a href="https://svn.boost.org/trac/boost/ticket/11241" target="_top">Trac #11241</a>.
|
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</li>
|
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</ul></div>
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<h4>
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<a name="boost_optional.relnotes.h9"></a>
|
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<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
|
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Release 1.58</a>
|
|
</h4>
|
|
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
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<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
|
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literal <code class="computeroutput"><span class="number">0</span></code>. This avoids a bug
|
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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
|
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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>
|
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by using safe-bool idiom. This addresses <a href="https://svn.boost.org/trac/boost/ticket/10825" target="_top">Trac
|
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#10825</a>.
|
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</li>
|
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<li class="listitem">
|
|
IOStream operators are now mentioned in documentation.
|
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</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>.
|
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This can be used to work around <a href="https://svn.boost.org/trac/boost/ticket/10399" target="_top">Trac
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#10399</a>.
|
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</li>
|
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<li class="listitem">
|
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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>
|
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is not assignable or convertible to <code class="computeroutput"><span class="identifier">T</span></code>
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(<a href="https://svn.boost.org/trac/boost/ticket/11087" target="_top">Trac #11087</a>).
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</li>
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<li class="listitem">
|
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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
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#10839</a>).
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</li>
|
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</ul></div>
|
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<h4>
|
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<a name="boost_optional.relnotes.h10"></a>
|
|
<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
|
|
Release 1.57</a>
|
|
</h4>
|
|
<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>:
|
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<span class="emphasis"><em>"Supply <code class="computeroutput"><span class="special"><</span><span class="identifier">string</span><span class="special">></span></code>
|
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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>.
|
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</li></ul></div>
|
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<h4>
|
|
<a name="boost_optional.relnotes.h11"></a>
|
|
<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
|
|
Release 1.56</a>
|
|
</h4>
|
|
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
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<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
|
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<a href="https://svn.boost.org/trac/boost/ticket/1841" target="_top">Trac #1841</a>,
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</li>
|
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<li class="listitem">
|
|
<code class="computeroutput"><span class="identifier">optional</span></code> is moveable, including
|
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conditional <code class="computeroutput"><span class="keyword">noexcept</span></code> specifications,
|
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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),
|
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</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>
|
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<span class="keyword">const</span><span class="special">&)</span></code>
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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
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#9005</a>),
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</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>
|
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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,
|
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</li>
|
|
<li class="listitem">
|
|
Binding temporaries to optional references is explicitly disallowed (breaking
|
|
change),
|
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</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>
|
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2018 Andrzej Krzemieński<p>
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