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Added has_value()

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Andrzej Krzemienski
2018-03-24 00:04:15 +01:00
parent 33c7a6aa2b
commit 5182f7f30f
49 changed files with 119 additions and 59 deletions
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4
doc/27_ref_optional_synopsis.qbk
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@ -182,6 +182,8 @@ They are empty, trivially copyable classes with disabled default constructor.
T const* get_ptr() const ; ``[link reference_optional_get_ptr __GO_TO__]`` T const* get_ptr() const ; ``[link reference_optional_get_ptr __GO_TO__]``
T* get_ptr() ; ``[link reference_optional_get_ptr __GO_TO__]`` T* get_ptr() ; ``[link reference_optional_get_ptr __GO_TO__]``
bool has_value() const noexcept ; ``[link reference_optional_operator_bool __GO_TO__]``
explicit operator bool() const noexcept ; ``[link reference_optional_operator_bool __GO_TO__]`` explicit operator bool() const noexcept ; ``[link reference_optional_operator_bool __GO_TO__]``
bool operator!() const noexcept ; ``[link reference_optional_operator_not __GO_TO__]`` bool operator!() const noexcept ; ``[link reference_optional_operator_not __GO_TO__]``
@ -256,6 +258,8 @@ They are empty, trivially copyable classes with disabled default constructor.
T* get_ptr() const noexcept ; ``[link reference_optional_ref_get_ptr __GO_TO__]`` T* get_ptr() const noexcept ; ``[link reference_optional_ref_get_ptr __GO_TO__]``
bool has_value() const noexcept ; ``[link reference_optional_ref_operator_bool __GO_TO__]``
explicit operator bool() const noexcept ; ``[link reference_optional_ref_operator_bool __GO_TO__]`` explicit operator bool() const noexcept ; ``[link reference_optional_ref_operator_bool __GO_TO__]``
bool operator!() const noexcept ; ``[link reference_optional_ref_operator_not __GO_TO__]`` bool operator!() const noexcept ; ``[link reference_optional_ref_operator_not __GO_TO__]``

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doc/28_ref_optional_semantics.qbk
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@ -754,6 +754,7 @@ __SPACE__
[#reference_optional_operator_bool] [#reference_optional_operator_bool]
[: `explicit optional<T>::operator bool() const noexcept ;`] [: `explicit optional<T>::operator bool() const noexcept ;`]
[: `bool optional<T>::has_value() const noexcept ;`]
* [*Returns:] `get_ptr() != 0`. * [*Returns:] `get_ptr() != 0`.
* [*Notes:] On compilers that do not support explicit conversion operators this falls back to safe-bool idiom. * [*Notes:] On compilers that do not support explicit conversion operators this falls back to safe-bool idiom.
@ -1040,6 +1041,7 @@ __SPACE__
__SPACE__ __SPACE__
[#reference_optional_ref_operator_bool] [#reference_optional_ref_operator_bool]
[: `bool has_value() const noexcept;`]
[: `optional<T&>::operator bool () const noexcept;`] [: `optional<T&>::operator bool () const noexcept;`]
* [*Returns:] `bool(ref)`. * [*Returns:] `bool(ref)`.

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doc/91_relnotes.qbk
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@ -11,6 +11,11 @@
[section:relnotes Release Notes] [section:relnotes Release Notes]
[heading Boost Release 1.68]
* Added member function `has_value()` for compatibility with `std::optional` ([@https://github.com/boostorg/optional/issues/52 issue #52]).
[heading Boost Release 1.67] [heading Boost Release 1.67]
* Fixed [@https://github.com/boostorg/optional/issues/46 issue #46]. * Fixed [@https://github.com/boostorg/optional/issues/46 issue #46].

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</p> </p>
<a name="reference_optional_ref_operator_bool"></a><div class="blockquote"><blockquote class="blockquote"><p> <a name="reference_optional_ref_operator_bool"></a><div class="blockquote"><blockquote class="blockquote"><p>
<code class="computeroutput"><span class="keyword">bool</span> <span class="identifier">has_value</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></code>
</p></blockquote></div>
<div class="blockquote"><blockquote class="blockquote"><p>
<code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;::</span><span class="keyword">operator</span> <span class="keyword">bool</span> <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;::</span><span class="keyword">operator</span> <span class="keyword">bool</span>
<span class="special">()</span> <span class="keyword">const</span> <span class="special">()</span> <span class="keyword">const</span>
<span class="keyword">noexcept</span><span class="special">;</span></code> <span class="keyword">noexcept</span><span class="special">;</span></code>

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@ -1592,6 +1592,9 @@
<span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="keyword">const</span> <span class="keyword">noexcept</span>
<span class="special">;</span></code> <span class="special">;</span></code>
</p></blockquote></div> </p></blockquote></div>
<div class="blockquote"><blockquote class="blockquote"><p>
<code class="computeroutput"><span class="keyword">bool</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">has_value</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span></code>
</p></blockquote></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">get_ptr</span><span class="special">()</span> <span class="special">!=</span> <span class="number">0</span></code>. <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="identifier">get_ptr</span><span class="special">()</span> <span class="special">!=</span> <span class="number">0</span></code>.

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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Optional References</title> <title>Optional References</title>
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<link rel="prev" href="header_optional_optional_values.html" title="Optional Values"> <link rel="prev" href="header_optional_optional_values.html" title="Optional Values">
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<span class="identifier">T</span><span class="special">*</span> <span class="identifier">get_ptr</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_get_ptr"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">get_ptr</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_get_ptr"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="keyword">bool</span> <span class="identifier">has_value</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_operator_bool"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="keyword">explicit</span> <span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_operator_bool"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="keyword">explicit</span> <span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_operator_bool"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_operator_not"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_references.html#reference_optional_ref_operator_not"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>

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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Optional Values</title> <title>Optional Values</title>
<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot">
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<link rel="prev" href="header_optional_in_place_init.html" title="Initialization tags"> <link rel="prev" href="header_optional_in_place_init.html" title="Initialization tags">
@ -108,6 +108,8 @@
<span class="identifier">T</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">get_ptr</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_get_ptr"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">get_ptr</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_get_ptr"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="identifier">T</span><span class="special">*</span> <span class="identifier">get_ptr</span><span class="special">()</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_get_ptr"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">get_ptr</span><span class="special">()</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_get_ptr"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="keyword">bool</span> <span class="identifier">has_value</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_operator_bool"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="keyword">explicit</span> <span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_operator_bool"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="keyword">explicit</span> <span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_operator_bool"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_operator_not"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics___optional_values.html#reference_optional_operator_not"><span class="inlinemediaobject"><img src="../../../images/callouts/R.png" alt="R"></span></a>

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<title>Header &lt;boost/optional/optional_io.hpp&gt;</title> <title>Header &lt;boost/optional/optional_io.hpp&gt;</title>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Detailed semantics</title> <title>Detailed semantics</title>
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@ -3,7 +3,7 @@
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Release Notes</title> <title>Release Notes</title>
<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> <link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot">
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@ -28,6 +28,29 @@
</h2></div></div></div> </h2></div></div></div>
<h4> <h4>
<a name="boost_optional.relnotes.h0"></a> <a name="boost_optional.relnotes.h0"></a>
<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
Release 1.68</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
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
#52</a>).
</li></ul></div>
<h4>
<a name="boost_optional.relnotes.h1"></a>
<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
Release 1.67</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed <a href="https://github.com/boostorg/optional/issues/46" target="_top">issue
#46</a>.
</li>
<li class="listitem">
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.
</li>
</ul></div>
<h4>
<a name="boost_optional.relnotes.h2"></a>
<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 <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
Release 1.66</a> Release 1.66</a>
</h4> </h4>
@ -45,7 +68,7 @@
</li> </li>
</ul></div> </ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h1"></a> <a name="boost_optional.relnotes.h3"></a>
<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 <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
Release 1.63</a> Release 1.63</a>
</h4> </h4>
@ -69,7 +92,7 @@
</li> </li>
</ul></div> </ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h2"></a> <a name="boost_optional.relnotes.h4"></a>
<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 <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
Release 1.62</a> Release 1.62</a>
</h4> </h4>
@ -77,7 +100,7 @@
Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>. Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>.
</li></ul></div> </li></ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h3"></a> <a name="boost_optional.relnotes.h5"></a>
<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 <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
Release 1.61</a> Release 1.61</a>
</h4> </h4>
@ -120,7 +143,7 @@
</li> </li>
</ul></div> </ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h4"></a> <a name="boost_optional.relnotes.h6"></a>
<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 <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
Release 1.60</a> Release 1.60</a>
</h4> </h4>
@ -131,7 +154,7 @@
#11203</a>. #11203</a>.
</li></ul></div> </li></ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h5"></a> <a name="boost_optional.relnotes.h7"></a>
<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 <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
Release 1.59</a> Release 1.59</a>
</h4> </h4>
@ -145,7 +168,7 @@
</li> </li>
</ul></div> </ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h6"></a> <a name="boost_optional.relnotes.h8"></a>
<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 <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
Release 1.58</a> Release 1.58</a>
</h4> </h4>
@ -181,7 +204,7 @@
</li> </li>
</ul></div> </ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h7"></a> <a name="boost_optional.relnotes.h9"></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 <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> Release 1.57</a>
</h4> </h4>
@ -191,7 +214,7 @@
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>. 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> </li></ul></div>
<h4> <h4>
<a name="boost_optional.relnotes.h8"></a> <a name="boost_optional.relnotes.h10"></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 <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> Release 1.56</a>
</h4> </h4>

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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Design Overview</title> <title>Design Overview</title>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>The Interface</title> <title>The Interface</title>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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doc/html/boost_optional/tutorial/optional_references.html
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@ -3,7 +3,7 @@
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<title>Optional references</title> <title>Optional references</title>
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doc/html/boost_optional/tutorial/optional_references/rebinding_semantics_for_assignment_of_optional_references.html
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@ -3,7 +3,7 @@
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15
doc/html/boost_optional/tutorial/performance_considerations.html
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@ -3,7 +3,7 @@
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Performance considerations</title> <title>Performance considerations</title>
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@ -56,12 +56,13 @@
<p> <p>
We call it a <span class="emphasis"><em>direct</em></span> storage. This makes <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code> a We call it a <span class="emphasis"><em>direct</em></span> storage. This makes <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code> a
trivially-copyable type for scalar <code class="computeroutput"><span class="identifier">T</span></code>s. trivially-copyable type for scalar <code class="computeroutput"><span class="identifier">T</span></code>s.
This only works for compilers that support defaulted functions. On compilers This only works for compilers that support defaulted functions (including
without defaulted functions we still use the direct storage, but <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code> is defaulted move assignment and constructor). On compilers without defaulted
no longer recognized as trivially-copyable. Apart from scalar types, we leave functions we still use the direct storage, but <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
the programmer a way of customizing her type, so that it is reconized by is no longer recognized as trivially-copyable. Apart from scalar types, we
<code class="computeroutput"><span class="identifier">optional</span></code> as candidate for leave the programmer a way of customizing her type, so that it is reconized
optimized storage, by specializing type trait <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">opitonal_config</span><span class="special">::</span><span class="identifier">optional_uses_direct_storage_for</span></code>: by <code class="computeroutput"><span class="identifier">optional</span></code> as candidate
for optimized storage, by specializing type trait <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">opitonal_config</span><span class="special">::</span><span class="identifier">optional_uses_direct_storage_for</span></code>:
</p> </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">X</span> <span class="comment">// not trivial</span> <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">X</span> <span class="comment">// not trivial</span>
<span class="special">{</span> <span class="special">{</span>

2
doc/html/boost_optional/tutorial/relational_operators.html
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@ -3,7 +3,7 @@
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2
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@ -3,7 +3,7 @@
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4
doc/html/index.html
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@ -3,7 +3,7 @@
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<title>Boost.Optional</title> <title>Boost.Optional</title>
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@ -146,7 +146,7 @@
</div> </div>
</div> </div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"><p><small>Last revised: May 17, 2017 at 23:01:39 GMT</small></p></td> <td align="left"><p><small>Last revised: March 23, 2018 at 23:01:17 GMT</small></p></td>
<td align="right"><div class="copyright-footer"></div></td> <td align="right"><div class="copyright-footer"></div></td>
</tr></table> </tr></table>
<hr> <hr>

2
doc/html/optional/reference.html
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@ -3,7 +3,7 @@
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2
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@ -3,7 +3,7 @@
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2
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@ -3,7 +3,7 @@
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1
include/boost/optional/detail/optional_reference_spec.hpp
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@ -159,6 +159,7 @@ public:
void reset() BOOST_NOEXCEPT { ptr_ = 0; } void reset() BOOST_NOEXCEPT { ptr_ = 0; }
bool is_initialized() const BOOST_NOEXCEPT { return ptr_ != 0; } bool is_initialized() const BOOST_NOEXCEPT { return ptr_ != 0; }
bool has_value() const BOOST_NOEXCEPT { return ptr_ != 0; }
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES #ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES

4
include/boost/optional/optional.hpp
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@ -375,7 +375,7 @@ class optional_base : public optional_tag
pointer_const_type get_ptr() const { return m_initialized ? get_ptr_impl() : 0 ; } pointer_const_type get_ptr() const { return m_initialized ? get_ptr_impl() : 0 ; }
pointer_type get_ptr() { return m_initialized ? get_ptr_impl() : 0 ; } pointer_type get_ptr() { return m_initialized ? get_ptr_impl() : 0 ; }
bool is_initialized() const { return m_initialized ; } bool is_initialized() const BOOST_NOEXCEPT { return m_initialized ; }
protected : protected :
@ -1333,6 +1333,8 @@ class optional
} }
#endif #endif
bool has_value() const BOOST_NOEXCEPT { return this->is_initialized() ; }
bool operator!() const BOOST_NOEXCEPT { return !this->is_initialized() ; } bool operator!() const BOOST_NOEXCEPT { return !this->is_initialized() ; }
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT() BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()

2
test/optional_test.cpp
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@ -32,7 +32,7 @@
#include "boost/core/lightweight_test.hpp" #include "boost/core/lightweight_test.hpp"
#include "optional_test_common.cpp" #include "optional_test_common.hpp"
void test_implicit_construction ( optional<double> opt, double v, double z ) void test_implicit_construction ( optional<double> opt, double v, double z )
{ {

12
test/optional_test_common.cpp → test/optional_test_common.hpp
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@ -194,6 +194,9 @@ inline void check_uninitialized_const ( optional<T> const& opt )
BOOST_TEST( !opt ) ; BOOST_TEST( !opt ) ;
BOOST_TEST( !get_pointer(opt) ) ; BOOST_TEST( !get_pointer(opt) ) ;
BOOST_TEST( !opt.get_ptr() ) ; BOOST_TEST( !opt.get_ptr() ) ;
BOOST_TEST( !opt.has_value() ) ;
BOOST_TEST( !opt.is_initialized() ) ;
BOOST_TEST( opt == boost::none ) ;
} }
template<class T> template<class T>
inline void check_uninitialized ( optional<T>& opt ) inline void check_uninitialized ( optional<T>& opt )
@ -204,6 +207,9 @@ inline void check_uninitialized ( optional<T>& opt )
BOOST_TEST( !opt ) ; BOOST_TEST( !opt ) ;
BOOST_TEST( !get_pointer(opt) ) ; BOOST_TEST( !get_pointer(opt) ) ;
BOOST_TEST( !opt.get_ptr() ) ; BOOST_TEST( !opt.get_ptr() ) ;
BOOST_TEST( !opt.has_value() ) ;
BOOST_TEST( !opt.is_initialized() ) ;
BOOST_TEST( opt == boost::none ) ;
check_uninitialized_const(opt); check_uninitialized_const(opt);
} }
@ -220,6 +226,9 @@ inline void check_initialized_const ( optional<T> const& opt )
BOOST_TEST ( !!opt ) ; BOOST_TEST ( !!opt ) ;
BOOST_TEST ( get_pointer(opt) ) ; BOOST_TEST ( get_pointer(opt) ) ;
BOOST_TEST ( opt.get_ptr() ) ; BOOST_TEST ( opt.get_ptr() ) ;
BOOST_TEST ( opt.has_value() ) ;
BOOST_TEST ( opt.is_initialized() ) ;
BOOST_TEST ( opt != boost::none ) ;
} }
template<class T> template<class T>
@ -234,6 +243,9 @@ inline void check_initialized ( optional<T>& opt )
BOOST_TEST ( !!opt ) ; BOOST_TEST ( !!opt ) ;
BOOST_TEST ( get_pointer(opt) ) ; BOOST_TEST ( get_pointer(opt) ) ;
BOOST_TEST ( opt.get_ptr() ) ; BOOST_TEST ( opt.get_ptr() ) ;
BOOST_TEST ( opt.has_value() ) ;
BOOST_TEST ( opt.is_initialized() ) ;
BOOST_TEST ( opt != boost::none ) ;
check_initialized_const(opt); check_initialized_const(opt);
} }