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Rebuild optional docs.
[SVN r57812]
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Optional references</title>
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<link rel="stylesheet" href="../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.74.0">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../index.html" title="Chapter<65>1.<2E>Boost.Optional">
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<link rel="up" href="../index.html" title="Chapter<65>1.<2E>Boost.Optional">
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<link rel="prev" href="examples.html" title="Examples">
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<div class="spirit-nav">
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<a accesskey="p" href="examples.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="rebinding_semantics_for_assignment_of_optional_references.html"><img src="../../../../../doc/html/images/next.png" alt="Next"></a>
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</div>
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<div class="section" lang="en">
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<div class="section" title="Optional references">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_optional.optional_references"></a><a class="link" href="optional_references.html" title="Optional references">Optional references</a>
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</h2></div></div></div>
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However, since references are not real objects some restrictions apply and
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some operations are not available in this case:
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</p>
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<div class="itemizedlist"><ul type="disc">
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<li>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Converting constructors
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</li>
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<li>
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<li class="listitem">
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Converting assignment
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</li>
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<li>
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<li class="listitem">
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InPlace construction
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</li>
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<li>
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<li class="listitem">
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InPlace assignment
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</li>
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<li>
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<li class="listitem">
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Value-access via pointer
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</li>
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</ul></div>
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treats it wrapped pseudo-object much as a real value, a true real reference
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is stored so aliasing will ocurr:
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</p>
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<div class="itemizedlist"><ul type="disc">
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<li>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Copies of <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">&></span></code>
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will copy the references but all these references will nonetheless reefer
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to the same object.
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</li>
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<li>
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<li class="listitem">
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Value-access will actually provide access to the referenced object rather
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than the reference itself.
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</li>
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