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Update optional documentation.
[SVN r82931]
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Development</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 V1.75.2">
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<meta name="generator" content="DocBook XSL Stylesheets V1.77.1">
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<link rel="home" href="../index.html" title="Chapter 1. Boost.Optional">
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<link rel="up" href="../index.html" title="Chapter 1. Boost.Optional">
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<link rel="prev" href="../index.html" title="Chapter 1. Boost.Optional">
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<div class="spirit-nav">
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<a accesskey="p" href="../index.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="synopsis.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="section boost_optional_development">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_optional.development"></a><a class="link" href="development.html" title="Development">Development</a>
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</h2></div></div></div>
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<dt><span class="section"><a href="development.html#boost_optional.development.the_semantics">The semantics</a></span></dt>
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<dt><span class="section"><a href="development.html#boost_optional.development.the_interface">The Interface</a></span></dt>
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</dl></div>
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<div class="section">
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<div class="section boost_optional_development_the_models">
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<div class="titlepage"><div><div><h3 class="title">
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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>
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</h3></div></div></div>
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<p>
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Discriminated-union:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>deep-copy</strong></span> semantics: copies of the variant
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implies copies of the value.
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<p>
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Single-element container:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>deep-copy</strong></span> semantics: copies of the container
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implies copies of the value.
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</li>
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</ul></div>
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</div>
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<div class="section">
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<div class="section boost_optional_development_the_semantics">
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<div class="titlepage"><div><div><h3 class="title">
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<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>
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</h3></div></div></div>
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We can draw from the purpose 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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the required basic semantics:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>Default Construction:</strong></span> To introduce a
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formally uninitialized wrapped object.
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via a pointer to the wrapped object or null.
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</p>
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</div>
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<div class="section">
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<div class="section boost_optional_development_the_interface">
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<div class="titlepage"><div><div><h3 class="title">
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<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>
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</h3></div></div></div>
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operations not provided by <code class="computeroutput"><span class="identifier">T</span></code>
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itself which are supported by a special interface.
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</p>
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<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>
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<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>
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<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
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<h5>
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<a name="boost_optional.development.the_interface.h0"></a>
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<span class="phrase"><a name="boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_"></a></span><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
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Value Access in the presence of possibly untitialized optional objects: The
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operators * and -></a>
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</h5>
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possible undefined value because of the idiomatic aid present in the <a href="../../../../utility/OptionalPointee.html" target="_top">OptionalPointee</a> concept
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incarnated by pointers.
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</p>
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<a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee"></a><h5>
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<a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee-heading"></a>
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<a class="link" href="development.html#boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee">Optional<T>
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<h5>
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<a name="boost_optional.development.the_interface.h1"></a>
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<span class="phrase"><a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee"></a></span><a class="link" href="development.html#boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee">Optional<T>
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as a model of OptionalPointee</a>
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</h5>
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<p>
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