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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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<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
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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</h2></div></div></div>
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<a name="id583998"></a>
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@ -36,8 +36,8 @@
the need for aligned storage.
</li>
<li class="listitem">
Douglas Gregor developed 'type_with_alignment', and later Eric Friedman coded
'aligned_storage', which are the core of the optional class implementation.
Douglas Gregor developed 'type_with_alignment', and later Eric Friedman
coded 'aligned_storage', which are the core of the optional class implementation.
</li>
<li class="listitem">
Andrei Alexandrescu and Brian Parker also worked with aligned storage techniques
@ -48,12 +48,12 @@
design.
</li>
<li class="listitem">
Vesa Karvonen and Douglas Gregor made quite useful comparisons between optional,
variant and any; and made other relevant comments.
Vesa Karvonen and Douglas Gregor made quite useful comparisons between
optional, variant and any; and made other relevant comments.
</li>
<li class="listitem">
Douglas Gregor and Peter Dimov commented on comparisons and evaluation in
boolean contexts.
Douglas Gregor and Peter Dimov commented on comparisons and evaluation
in boolean contexts.
</li>
<li class="listitem">
Eric Friedman helped understand the issues involved with aligned storage,
@ -65,7 +65,7 @@
</li>
</ul></div>
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<a name="id584068"></a>
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</h4>
@ -73,14 +73,14 @@
<li class="listitem">
William Kempf carefully considered the originally proposed interface 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
about relational operators.
fueled the discussion about the analogy optional&lt;&gt;/smart pointer
and about relational operators.
</li>
<li class="listitem">
Peter Dimov, Joel de Guzman, David Abrahams, Tanton Gibbs and Ian Hanson
focused on the relational semantics of optional (originally undefined); concluding
with the fact that the pointer-like interface doesn't make it a pointer so
it shall have deep relational operators.
focused on the relational semantics of optional (originally undefined);
concluding with the fact that the pointer-like interface doesn't make it
a pointer so it shall have deep relational operators.
</li>
<li class="listitem">
Augustus Saunders also explored the different relational semantics between
@ -96,22 +96,22 @@
the Maybe type constructor (analogy originally pointed out by David Sankel).
</li>
<li class="listitem">
Other comments were posted by Vincent Finn, Anthony Williams, Ed Brey, Rob
Stewart, and others.
Other comments were posted by Vincent Finn, Anthony Williams, Ed Brey,
Rob Stewart, and others.
</li>
<li class="listitem">
Joel de Guzman made the case for the support of references and helped with
the proper semantics.
</li>
<li class="listitem">
Mat Marcus shown the virtues of a value-oriented interface, influencing the
current design, and contributed the idea of "none".
Mat Marcus shown the virtues of a value-oriented interface, influencing
the current design, and contributed the idea of "none".
</li>
</ul></div>
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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>)
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</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_interface">The Interface</a></span></dt>
</dl></div>
<div class="section" title="The models">
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<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>
@ -132,8 +132,8 @@
models testing if the optional is initialized
</li>
<li class="listitem">
Trying to extract a <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>,
Trying to extract a <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
optional
</li>
@ -162,13 +162,13 @@
Testing if the container is empty models testing if the optional is initialized
</li>
<li class="listitem">
Trying to extract a <code class="computeroutput"><span class="identifier">T</span></code> from
an empty container models the undefined behavior of trying to access the
value of an uninitialized optional
Trying to extract a <code class="computeroutput"><span class="identifier">T</span></code>
from an empty container models the undefined behavior of trying to access
the value of an uninitialized optional
</li>
</ul></div>
</div>
<div class="section" title="The semantics">
<div class="section">
<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>
</h3></div></div></div>
@ -195,17 +195,17 @@
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<span class="bold"><strong>Default Construction:</strong></span> To introduce a formally
uninitialized wrapped object.
<span class="bold"><strong>Default Construction:</strong></span> To introduce a
formally uninitialized wrapped object.
</li>
<li class="listitem">
<span class="bold"><strong>Direct Value Construction via copy:</strong></span> To
introduce a formally initialized wrapped object whose value is obtained
<span class="bold"><strong>Direct Value Construction via copy:</strong></span>
To introduce a formally initialized wrapped object whose value is obtained
as a copy of some object.
</li>
<li class="listitem">
<span class="bold"><strong>Deep Copy Construction:</strong></span> To obtain a new
yet equivalent wrapped object.
<span class="bold"><strong>Deep Copy Construction:</strong></span> To obtain a
new yet equivalent wrapped object.
</li>
<li class="listitem">
<span class="bold"><strong>Direct Value Assignment (upon initialized):</strong></span>
@ -221,8 +221,8 @@
to the wrapped object the value of another wrapped object.
</li>
<li class="listitem">
<span class="bold"><strong>Assignment (upon uninitialized):</strong></span> To initialize
the wrapped object with value of another wrapped object.
<span class="bold"><strong>Assignment (upon uninitialized):</strong></span> To
initialize the wrapped object with value of another wrapped object.
</li>
<li class="listitem">
<span class="bold"><strong>Deep Relational Operations (when supported by the
@ -230,7 +230,8 @@
the presence of uninitialized states.
</li>
<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 class="listitem">
<span class="bold"><strong>Initialization state query:</strong></span> To determine
@ -252,7 +253,7 @@
via a pointer to the wrapped object or null.
</p>
</div>
<div class="section" title="The Interface">
<div class="section">
<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>
</h3></div></div></div>
@ -292,7 +293,7 @@
itself which are supported by a special interface.
</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="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
Value Access in the presence of possibly untitialized optional objects: The
operators * and -&gt;</a>
@ -357,7 +358,7 @@
incarnated by pointers.
</p>
<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;
as a model of OptionalPointee</a>
</h5>
@ -367,9 +368,9 @@
about the possibly uninitialized state appealing to the familiar pointer
semantics w.r.t. to null pointers.
</p>
<div class="warning" title="Warning"><table border="0" summary="Warning">
<div class="warning"><table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../doc/html/images/warning.png"></td>
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@ -398,7 +399,7 @@
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<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
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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@ -406,7 +407,7 @@
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@ -13,16 +13,16 @@
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</div>
<div class="section" title="Examples">
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<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>
</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
expensive unnecessary default construction</a></span></dt>
</dl></div>
<div class="section" title="Optional return values">
<div class="section">
<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
return values</a>
@ -57,7 +57,7 @@
<span class="special">}</span>
</pre>
</div>
<div class="section" title="Optional local variables">
<div class="section">
<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
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>
</pre>
</div>
<div class="section" title="Optional data members">
<div class="section">
<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
data members</a>
@ -116,7 +116,7 @@
<span class="special">};</span>
</pre>
</div>
<div class="section" title="Bypassing expensive unnecessary default construction">
<div class="section">
<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
expensive unnecessary default construction</a>
@ -133,7 +133,7 @@
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<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
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>
@ -141,7 +141,7 @@
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<div class="section" title="Exception Safety Guarantees">
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<a name="boost_optional.exception_safety_guarantees"></a><a class="link" href="exception_safety_guarantees.html" title="Exception Safety Guarantees">Exception Safety
Guarantees</a>
@ -32,20 +32,28 @@
Notes</a>), all of the assignment methods:
</p>
<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="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="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">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="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="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">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="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>
<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>
<p>
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:
</p>
<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"><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>
<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">
<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>
<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>)
@ -112,7 +124,7 @@
<span class="special">}</span>
</pre>
<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>
</h4>
<p>
@ -126,7 +138,7 @@
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<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
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>
@ -134,7 +146,7 @@
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<a name="boost_optional.implementation_notes"></a><a class="link" href="implementation_notes.html" title="Implementation Notes">Implementation Notes</a>
</h2></div></div></div>
@ -41,7 +41,7 @@
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<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
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@ -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>
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@ -134,7 +134,7 @@
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@ -142,7 +142,7 @@
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@ -39,7 +39,7 @@
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<span class="firstname">Fernando Luis</span> <span class="surname">Cacciola Carballal</span>
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Clearly, we need a better idiom.
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@ -500,6 +500,23 @@ assert ( *opt1 == static_cast<U>(v) ) ;
__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]
[: `void optional<T` ['(not a ref)]`>::reset( T const& v ) ;`]