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Add assignment operators taking an InPlaceFactory to the Detailed Semantics section. Fixes #5378.

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[SVN r71048]
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Steven Watanabe
2011-04-06 20:54:18 +00:00
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@ -36,8 +36,8 @@
the need for aligned storage. the need for aligned storage.
</li> </li>
<li class="listitem"> <li class="listitem">
Douglas Gregor developed 'type_with_alignment', and later Eric Friedman coded Douglas Gregor developed 'type_with_alignment', and later Eric Friedman
'aligned_storage', which are the core of the optional class implementation. coded 'aligned_storage', which are the core of the optional class implementation.
</li> </li>
<li class="listitem"> <li class="listitem">
Andrei Alexandrescu and Brian Parker also worked with aligned storage techniques Andrei Alexandrescu and Brian Parker also worked with aligned storage techniques
@ -48,12 +48,12 @@
design. design.
</li> </li>
<li class="listitem"> <li class="listitem">
Vesa Karvonen and Douglas Gregor made quite useful comparisons between optional, Vesa Karvonen and Douglas Gregor made quite useful comparisons between
variant and any; and made other relevant comments. optional, variant and any; and made other relevant comments.
</li> </li>
<li class="listitem"> <li class="listitem">
Douglas Gregor and Peter Dimov commented on comparisons and evaluation in Douglas Gregor and Peter Dimov commented on comparisons and evaluation
boolean contexts. in boolean contexts.
</li> </li>
<li class="listitem"> <li class="listitem">
Eric Friedman helped understand the issues involved with aligned storage, Eric Friedman helped understand the issues involved with aligned storage,
@ -65,7 +65,7 @@
</li> </li>
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<a name="id584068"></a> <a name="boost_optional.acknowledgments.post_formal_review-heading"></a>
<a class="link" href="acknowledgments.html#boost_optional.acknowledgments.post_formal_review">Post-formal <a class="link" href="acknowledgments.html#boost_optional.acknowledgments.post_formal_review">Post-formal
review</a> review</a>
</h4> </h4>
@ -73,14 +73,14 @@
<li class="listitem"> <li class="listitem">
William Kempf carefully considered the originally proposed interface and William Kempf carefully considered the originally proposed interface and
suggested the new interface which is currently used. He also started and suggested the new interface which is currently used. He also started and
fueled the discussion about the analogy optional&lt;&gt;/smart pointer and fueled the discussion about the analogy optional&lt;&gt;/smart pointer
about relational operators. and about relational operators.
</li> </li>
<li class="listitem"> <li class="listitem">
Peter Dimov, Joel de Guzman, David Abrahams, Tanton Gibbs and Ian Hanson Peter Dimov, Joel de Guzman, David Abrahams, Tanton Gibbs and Ian Hanson
focused on the relational semantics of optional (originally undefined); concluding focused on the relational semantics of optional (originally undefined);
with the fact that the pointer-like interface doesn't make it a pointer so concluding with the fact that the pointer-like interface doesn't make it
it shall have deep relational operators. a pointer so it shall have deep relational operators.
</li> </li>
<li class="listitem"> <li class="listitem">
Augustus Saunders also explored the different relational semantics between Augustus Saunders also explored the different relational semantics between
@ -96,22 +96,22 @@
the Maybe type constructor (analogy originally pointed out by David Sankel). the Maybe type constructor (analogy originally pointed out by David Sankel).
</li> </li>
<li class="listitem"> <li class="listitem">
Other comments were posted by Vincent Finn, Anthony Williams, Ed Brey, Rob Other comments were posted by Vincent Finn, Anthony Williams, Ed Brey,
Stewart, and others. Rob Stewart, and others.
</li> </li>
<li class="listitem"> <li class="listitem">
Joel de Guzman made the case for the support of references and helped with Joel de Guzman made the case for the support of references and helped with
the proper semantics. the proper semantics.
</li> </li>
<li class="listitem"> <li class="listitem">
Mat Marcus shown the virtues of a value-oriented interface, influencing the Mat Marcus shown the virtues of a value-oriented interface, influencing
current design, and contributed the idea of "none". the current design, and contributed the idea of "none".
</li> </li>
</ul></div> </ul></div>
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</div> </div>
<div class="section" title="Development"> <div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both"> <div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_optional.development"></a><a class="link" href="development.html" title="Development">Development</a> <a name="boost_optional.development"></a><a class="link" href="development.html" title="Development">Development</a>
</h2></div></div></div> </h2></div></div></div>
@ -31,7 +31,7 @@
<dt><span class="section"><a href="development.html#boost_optional.development.the_semantics">The semantics</a></span></dt> <dt><span class="section"><a href="development.html#boost_optional.development.the_semantics">The semantics</a></span></dt>
<dt><span class="section"><a href="development.html#boost_optional.development.the_interface">The Interface</a></span></dt> <dt><span class="section"><a href="development.html#boost_optional.development.the_interface">The Interface</a></span></dt>
</dl></div> </dl></div>
<div class="section" title="The models"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.development.the_models"></a><a class="link" href="development.html#boost_optional.development.the_models" title="The models">The models</a> <a name="boost_optional.development.the_models"></a><a class="link" href="development.html#boost_optional.development.the_models" title="The models">The models</a>
</h3></div></div></div> </h3></div></div></div>
@ -112,11 +112,11 @@
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>deep-copy</strong></span> semantics: copies of the variant <span class="bold"><strong>deep-copy</strong></span> semantics: copies of the variant
implies copies of the value. implies copies of the value.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>deep-relational</strong></span> semantics: comparisons <span class="bold"><strong>deep-relational</strong></span> semantics: comparisons
between variants matches both current types and values between variants matches both current types and values
</li> </li>
<li class="listitem"> <li class="listitem">
@ -132,8 +132,8 @@
models testing if the optional is initialized models testing if the optional is initialized
</li> </li>
<li class="listitem"> <li class="listitem">
Trying to extract a <code class="computeroutput"><span class="identifier">T</span></code> from Trying to extract a <code class="computeroutput"><span class="identifier">T</span></code>
a variant when its current type is not <code class="computeroutput"><span class="identifier">T</span></code>, from a variant when its current type is not <code class="computeroutput"><span class="identifier">T</span></code>,
models the undefined behavior of trying to access the value of an uninitialized models the undefined behavior of trying to access the value of an uninitialized
optional optional
</li> </li>
@ -143,11 +143,11 @@
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>deep-copy</strong></span> semantics: copies of the container <span class="bold"><strong>deep-copy</strong></span> semantics: copies of the container
implies copies of the value. implies copies of the value.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>deep-relational</strong></span> semantics: comparisons <span class="bold"><strong>deep-relational</strong></span> semantics: comparisons
between containers compare container size and if match, contained value between containers compare container size and if match, contained value
</li> </li>
<li class="listitem"> <li class="listitem">
@ -162,13 +162,13 @@
Testing if the container is empty models testing if the optional is initialized Testing if the container is empty models testing if the optional is initialized
</li> </li>
<li class="listitem"> <li class="listitem">
Trying to extract a <code class="computeroutput"><span class="identifier">T</span></code> from Trying to extract a <code class="computeroutput"><span class="identifier">T</span></code>
an empty container models the undefined behavior of trying to access the from an empty container models the undefined behavior of trying to access
value of an uninitialized optional the value of an uninitialized optional
</li> </li>
</ul></div> </ul></div>
</div> </div>
<div class="section" title="The semantics"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.development.the_semantics"></a><a class="link" href="development.html#boost_optional.development.the_semantics" title="The semantics">The semantics</a> <a name="boost_optional.development.the_semantics"></a><a class="link" href="development.html#boost_optional.development.the_semantics" title="The semantics">The semantics</a>
</h3></div></div></div> </h3></div></div></div>
@ -195,54 +195,55 @@
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Default Construction:</strong></span> To introduce a formally <span class="bold"><strong>Default Construction:</strong></span> To introduce a
uninitialized wrapped object. formally uninitialized wrapped object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Direct Value Construction via copy:</strong></span> To <span class="bold"><strong>Direct Value Construction via copy:</strong></span>
introduce a formally initialized wrapped object whose value is obtained To introduce a formally initialized wrapped object whose value is obtained
as a copy of some object. as a copy of some object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Deep Copy Construction:</strong></span> To obtain a new <span class="bold"><strong>Deep Copy Construction:</strong></span> To obtain a
yet equivalent wrapped object. new yet equivalent wrapped object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Direct Value Assignment (upon initialized):</strong></span> <span class="bold"><strong>Direct Value Assignment (upon initialized):</strong></span>
To assign a value to the wrapped object. To assign a value to the wrapped object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Direct Value Assignment (upon uninitialized):</strong></span> <span class="bold"><strong>Direct Value Assignment (upon uninitialized):</strong></span>
To initialize the wrapped object with a value obtained as a copy of some To initialize the wrapped object with a value obtained as a copy of some
object. object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Assignment (upon initialized):</strong></span> To assign <span class="bold"><strong>Assignment (upon initialized):</strong></span> To assign
to the wrapped object the value of another wrapped object. to the wrapped object the value of another wrapped object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Assignment (upon uninitialized):</strong></span> To initialize <span class="bold"><strong>Assignment (upon uninitialized):</strong></span> To
the wrapped object with value of another wrapped object. initialize the wrapped object with value of another wrapped object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Deep Relational Operations (when supported by the <span class="bold"><strong>Deep Relational Operations (when supported by the
type T):</strong></span> To compare wrapped object values taking into account type T):</strong></span> To compare wrapped object values taking into account
the presence of uninitialized states. the presence of uninitialized states.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Value access:</strong></span> To unwrap the wrapped object. <span class="bold"><strong>Value access:</strong></span> To unwrap the wrapped
object.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Initialization state query:</strong></span> To determine <span class="bold"><strong>Initialization state query:</strong></span> To determine
if the object is formally initialized or not. if the object is formally initialized or not.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>Swap:</strong></span> To exchange wrapped objects. (with <span class="bold"><strong>Swap:</strong></span> To exchange wrapped objects. (with
whatever exception safety guarantees are provided by <code class="computeroutput"><span class="identifier">T</span></code>'s whatever exception safety guarantees are provided by <code class="computeroutput"><span class="identifier">T</span></code>'s
swap). swap).
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="bold"><strong>De-initialization:</strong></span> To release the wrapped <span class="bold"><strong>De-initialization:</strong></span> To release the wrapped
object (if any) and leave the wrapper in the uninitialized state. object (if any) and leave the wrapper in the uninitialized state.
</li> </li>
</ul></div> </ul></div>
@ -252,7 +253,7 @@
via a pointer to the wrapped object or null. via a pointer to the wrapped object or null.
</p> </p>
</div> </div>
<div class="section" title="The Interface"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.development.the_interface"></a><a class="link" href="development.html#boost_optional.development.the_interface" title="The Interface">The Interface</a> <a name="boost_optional.development.the_interface"></a><a class="link" href="development.html#boost_optional.development.the_interface" title="The Interface">The Interface</a>
</h3></div></div></div> </h3></div></div></div>
@ -292,7 +293,7 @@
itself which are supported by a special interface. itself which are supported by a special interface.
</p> </p>
<a name="boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_"></a><h5> <a name="boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_"></a><h5>
<a name="id555569"></a> <a name="boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_-heading"></a>
<a class="link" href="development.html#boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_">Lexically-hinted <a class="link" href="development.html#boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_">Lexically-hinted
Value Access in the presence of possibly untitialized optional objects: The Value Access in the presence of possibly untitialized optional objects: The
operators * and -&gt;</a> operators * and -&gt;</a>
@ -357,7 +358,7 @@
incarnated by pointers. incarnated by pointers.
</p> </p>
<a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee"></a><h5> <a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee"></a><h5>
<a name="id555831"></a> <a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee-heading"></a>
<a class="link" href="development.html#boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee">Optional&lt;T&gt; <a class="link" href="development.html#boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee">Optional&lt;T&gt;
as a model of OptionalPointee</a> as a model of OptionalPointee</a>
</h5> </h5>
@ -367,9 +368,9 @@
about the possibly uninitialized state appealing to the familiar pointer about the possibly uninitialized state appealing to the familiar pointer
semantics w.r.t. to null pointers. semantics w.r.t. to null pointers.
</p> </p>
<div class="warning" title="Warning"><table border="0" summary="Warning"> <div class="warning"><table border="0" summary="Warning">
<tr> <tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../doc/html/images/warning.png"></td> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../doc/src/images/warning.png"></td>
<th align="left">Warning</th> <th align="left">Warning</th>
</tr> </tr>
<tr><td align="left" valign="top"><p> <tr><td align="left" valign="top"><p>
@ -398,7 +399,7 @@
</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"></td> <td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <EFBFBD> 2003 -2007 Fernando Luis Cacciola Carballal<p> <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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>) 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>)
</p> </p>
@ -406,7 +407,7 @@
</tr></table> </tr></table>
<hr> <hr>
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@ -1,11 +1,11 @@
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<head> <head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Examples</title> <title>Examples</title>
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<link rel="prev" href="detailed_semantics.html" title="Detailed Semantics"> <link rel="prev" href="detailed_semantics.html" title="Detailed Semantics">
<link rel="next" href="optional_references.html" title="Optional references"> <link rel="next" href="optional_references.html" title="Optional references">
</head> </head>
@ -13,16 +13,16 @@
<table cellpadding="2" width="100%"><tr> <table cellpadding="2" width="100%"><tr>
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<a accesskey="p" href="detailed_semantics.html"><img src="../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="optional_references.html"><img src="../../../../../doc/html/images/next.png" alt="Next"></a> <a accesskey="p" href="detailed_semantics.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="optional_references.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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<div class="section" title="Examples"> <div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both"> <div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_optional.examples"></a><a class="link" href="examples.html" title="Examples">Examples</a> <a name="boost_optional.examples"></a><a class="link" href="examples.html" title="Examples">Examples</a>
</h2></div></div></div> </h2></div></div></div>
@ -36,7 +36,7 @@
<dt><span class="section"><a href="examples.html#boost_optional.examples.bypassing_expensive_unnecessary_default_construction">Bypassing <dt><span class="section"><a href="examples.html#boost_optional.examples.bypassing_expensive_unnecessary_default_construction">Bypassing
expensive unnecessary default construction</a></span></dt> expensive unnecessary default construction</a></span></dt>
</dl></div> </dl></div>
<div class="section" title="Optional return values"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.examples.optional_return_values"></a><a class="link" href="examples.html#boost_optional.examples.optional_return_values" title="Optional return values">Optional <a name="boost_optional.examples.optional_return_values"></a><a class="link" href="examples.html#boost_optional.examples.optional_return_values" title="Optional return values">Optional
return values</a> return values</a>
@ -57,7 +57,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
</div> </div>
<div class="section" title="Optional local variables"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.examples.optional_local_variables"></a><a class="link" href="examples.html#boost_optional.examples.optional_local_variables" title="Optional local variables">Optional <a name="boost_optional.examples.optional_local_variables"></a><a class="link" href="examples.html#boost_optional.examples.optional_local_variables" title="Optional local variables">Optional
local variables</a> local variables</a>
@ -78,7 +78,7 @@
<span class="keyword">else</span> <span class="identifier">print</span><span class="special">(</span><span class="string">"employer's name not found!"</span><span class="special">);</span> <span class="keyword">else</span> <span class="identifier">print</span><span class="special">(</span><span class="string">"employer's name not found!"</span><span class="special">);</span>
</pre> </pre>
</div> </div>
<div class="section" title="Optional data members"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.examples.optional_data_members"></a><a class="link" href="examples.html#boost_optional.examples.optional_data_members" title="Optional data members">Optional <a name="boost_optional.examples.optional_data_members"></a><a class="link" href="examples.html#boost_optional.examples.optional_data_members" title="Optional data members">Optional
data members</a> data members</a>
@ -116,7 +116,7 @@
<span class="special">};</span> <span class="special">};</span>
</pre> </pre>
</div> </div>
<div class="section" title="Bypassing expensive unnecessary default construction"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.examples.bypassing_expensive_unnecessary_default_construction"></a><a class="link" href="examples.html#boost_optional.examples.bypassing_expensive_unnecessary_default_construction" title="Bypassing expensive unnecessary default construction">Bypassing <a name="boost_optional.examples.bypassing_expensive_unnecessary_default_construction"></a><a class="link" href="examples.html#boost_optional.examples.bypassing_expensive_unnecessary_default_construction" title="Bypassing expensive unnecessary default construction">Bypassing
expensive unnecessary default construction</a> expensive unnecessary default construction</a>
@ -133,7 +133,7 @@
</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"></td> <td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <EFBFBD> 2003 -2007 Fernando Luis Cacciola Carballal<p> <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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>) 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>)
</p> </p>
@ -141,7 +141,7 @@
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<div class="section" title="Exception Safety Guarantees"> <div class="section">
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@ -32,20 +32,28 @@
Notes</a>), all of the assignment methods: Notes</a>), all of the assignment methods:
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <li class="listitem">
<code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">)</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">)</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">)</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">InPlaceFactory</span><span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">InPlaceFactory</span>
<span class="keyword">const</span><span class="special">&amp;</span> <span class="keyword">const</span><span class="special">&amp;</span>
<span class="special">)</span></code></li> <span class="special">)</span></code>
<li class="listitem"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">)</span></code></li> </li>
<li class="listitem"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;</span> <li class="listitem">
<code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">TypedInPlaceFactory</span><span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">TypedInPlaceFactory</span>
<span class="keyword">const</span><span class="special">&amp;</span> <span class="keyword">const</span><span class="special">&amp;</span>
<span class="special">)</span></code></li> <span class="special">)</span> </code>
<li class="listitem"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">InPlaceFactory</span><span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">InPlaceFactory</span> </li>
<span class="keyword">const</span><span class="special">&amp;</span> <li class="listitem">
<span class="special">)</span></code></li> <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;:::</span><span class="identifier">reset</span> <span class="special">(</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;)</span></code>
<li class="listitem"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">TypedInPlaceFactory</span><span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">TypedInPlaceFactory</span> </li>
<span class="keyword">const</span><span class="special">&amp;</span>
<span class="special">)</span> </code></li>
<li class="listitem"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;:::</span><span class="identifier">reset</span> <span class="special">(</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;)</span></code></li>
</ul></div> </ul></div>
<p> <p>
Can only <span class="emphasis"><em>guarantee</em></span> the <span class="underline">basic Can only <span class="emphasis"><em>guarantee</em></span> the <span class="underline">basic
@ -57,8 +65,12 @@
On the other hand, the <span class="emphasis"><em>uninitializing</em></span> methods: On the other hand, the <span class="emphasis"><em>uninitializing</em></span> methods:
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">none_t</span> <span class="special">)</span></code></li> <li class="listitem">
<li class="listitem"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">reset</span><span class="special">()</span></code></li> <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">none_t</span> <span class="special">)</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">reset</span><span class="special">()</span></code>
</li>
</ul></div> </ul></div>
<p> <p>
Provide the no-throw guarantee (assuming a no-throw <code class="computeroutput"><span class="identifier">T</span><span class="special">::~</span><span class="identifier">T</span><span class="special">()</span></code>) Provide the no-throw guarantee (assuming a no-throw <code class="computeroutput"><span class="identifier">T</span><span class="special">::~</span><span class="identifier">T</span><span class="special">()</span></code>)
@ -112,7 +124,7 @@
<span class="special">}</span> <span class="special">}</span>
</pre> </pre>
<a name="boost_optional.exception_safety_guarantees.swap"></a><h4> <a name="boost_optional.exception_safety_guarantees.swap"></a><h4>
<a name="id583497"></a> <a name="boost_optional.exception_safety_guarantees.swap-heading"></a>
<a class="link" href="exception_safety_guarantees.html#boost_optional.exception_safety_guarantees.swap">Swap</a> <a class="link" href="exception_safety_guarantees.html#boost_optional.exception_safety_guarantees.swap">Swap</a>
</h4> </h4>
<p> <p>
@ -126,7 +138,7 @@
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Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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@ -134,7 +146,7 @@
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@ -129,11 +129,11 @@
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"> <li class="listitem">
<span class="underline">TypedInPlaceFactories</span>: those which <span class="underline">TypedInPlaceFactories</span>: those which
take the target type as a primary template parameter. take the target type as a primary template parameter.
</li> </li>
<li class="listitem"> <li class="listitem">
<span class="underline">InPlaceFactories</span>: those with a template <span class="underline">InPlaceFactories</span>: those with a template
<code class="computeroutput"><span class="identifier">construct</span><span class="special">(</span><span class="keyword">void</span><span class="special">*)</span></code> member <code class="computeroutput"><span class="identifier">construct</span><span class="special">(</span><span class="keyword">void</span><span class="special">*)</span></code> member
function taking the target type. function taking the target type.
</li> </li>
@ -182,7 +182,7 @@
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<td align="left"></td> <td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <EFBFBD> 2003 -2007 Fernando Luis Cacciola Carballal<p> <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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>) 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>)
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@ -190,7 +190,7 @@
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@ -71,7 +71,7 @@
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<td align="right"><div class="copyright-footer">Copyright <EFBFBD> 2003 -2007 Fernando Luis Cacciola Carballal<p> <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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>) 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>)
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semantics for assignment of optional references</a> semantics for assignment of optional references</a>
@ -70,7 +70,7 @@
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">b</span><span class="special">==</span><span class="number">3</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">b</span><span class="special">==</span><span class="number">3</span><span class="special">);</span>
</pre> </pre>
<a name="boost_optional.rebinding_semantics_for_assignment_of_optional_references.rationale"></a><h4> <a name="boost_optional.rebinding_semantics_for_assignment_of_optional_references.rationale"></a><h4>
<a name="id579234"></a> <a name="boost_optional.rebinding_semantics_for_assignment_of_optional_references.rationale-heading"></a>
<a class="link" href="rebinding_semantics_for_assignment_of_optional_references.html#boost_optional.rebinding_semantics_for_assignment_of_optional_references.rationale">Rationale</a> <a class="link" href="rebinding_semantics_for_assignment_of_optional_references.html#boost_optional.rebinding_semantics_for_assignment_of_optional_references.rationale">Rationale</a>
</h4> </h4>
<p> <p>
@ -134,7 +134,7 @@
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Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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</p> </p>
@ -142,7 +142,7 @@
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Distributed under the Boost Software License, Version 1.0. (See accompanying Distributed under the Boost Software License, Version 1.0. (See accompanying
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>) 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>)
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<span class="firstname">Fernando Luis</span> <span class="surname">Cacciola Carballal</span> <span class="firstname">Fernando Luis</span> <span class="surname">Cacciola Carballal</span>
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@ -81,15 +81,14 @@
</p> </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"> <div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"> <li class="listitem">
(A) <code class="computeroutput"><span class="keyword">double</span> <span class="identifier">sqrt</span><span class="special">(</span><span class="keyword">double</span> <span class="identifier">n</span> (A) <code class="computeroutput"><span class="keyword">double</span> <span class="identifier">sqrt</span><span class="special">(</span><span class="keyword">double</span> <span class="identifier">n</span> <span class="special">);</span></code>
<span class="special">);</span></code> </li>
</li>
<li class="listitem"> <li class="listitem">
(B) <code class="computeroutput"><span class="keyword">char</span> <span class="identifier">get_async_input</span><span class="special">();</span></code> (B) <code class="computeroutput"><span class="keyword">char</span> <span class="identifier">get_async_input</span><span class="special">();</span></code>
</li> </li>
<li class="listitem"> <li class="listitem">
(C) <code class="computeroutput"><span class="identifier">point</span> <span class="identifier">polygon</span><span class="special">::</span><span class="identifier">get_any_point_effectively_inside</span><span class="special">();</span></code> (C) <code class="computeroutput"><span class="identifier">point</span> <span class="identifier">polygon</span><span class="special">::</span><span class="identifier">get_any_point_effectively_inside</span><span class="special">();</span></code>
</li> </li>
</ul></div> </ul></div>
<p> <p>
There are different approaches to the issue of not having a value to return. There are different approaches to the issue of not having a value to return.
@ -162,14 +161,12 @@
Clearly, we need a better idiom. Clearly, we need a better idiom.
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<td align="left"><p><small>Last revised: November 20, 2009 at 10:24:28 GMT</small></p></td> <td align="left"><p><small>Last revised: April 06, 2011 at 20:44:42 GMT</small></p></td>
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@ -500,6 +500,23 @@ assert ( *opt1 == static_cast<U>(v) ) ;
__SPACE__ __SPACE__
[#reference_optional_operator_equal_factory]
[: `template<InPlaceFactory> optional<T>& optional<T` ['(not a ref)]`>::operator=( InPlaceFactory const& f );`]
[: `template<TypedInPlaceFactory> optional<T>& optional<T` ['(not a ref)]`>::operator=( TypedInPlaceFactory const& f );`]
* [*Effect:] Assigns an `optional` with a value of `T` obtained from the
factory.
* [*Postconditions: ] `*this` is [_initialized] and its value is ['directly given]
from the factory `f` (i.e., the value [_is not copied]).
* [*Throws:] Whatever the `T` constructor called by the factory throws.
* [*Notes:] See [link boost_optional.in_place_factories In-Place Factories]
* [*Exception Safety:] Exceptions can only be thrown during the call to
the `T` constructor used by the factory; in that case, the `optional` object
will be left empty.
__SPACE__
[#reference_optional_reset_value] [#reference_optional_reset_value]
[: `void optional<T` ['(not a ref)]`>::reset( T const& v ) ;`] [: `void optional<T` ['(not a ref)]`>::reset( T const& v ) ;`]