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Stop reserving rights.
[SVN r26085]
This commit is contained in:
Dave Abrahams
@ -3,7 +3,8 @@
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.2.8: http://docutils.sourceforge.net/" />
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<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
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<title></title>
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<link rel="stylesheet" href="default.css" type="text/css" />
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</head>
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<body>
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@ -38,64 +39,91 @@ class indirect_iterator
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> const& y
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, typename enable_if_convertible<Iterator2, Iterator>::type* = 0 // exposition
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);
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Iterator const& base() const;
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reference operator*() const;
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indirect_iterator& operator++();
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indirect_iterator& operator--();
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private:
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Iterator m_iterator; // exposition
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};
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</pre>
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<p>The member types of <tt class="literal"><span class="pre">indirect_iterator</span></tt> are defined according to the
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following pseudo-code. We use the abbreviation
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<tt class="literal"><span class="pre">V=iterator_traits<Iterator>::value_type</span></tt> and <tt class="literal"><span class="pre">v</span></tt> is an object of
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type <tt class="literal"><span class="pre">V</span></tt>.:</p>
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<p>The member types of <tt class="literal"><span class="pre">indirect_iterator</span></tt> are defined according to
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the following pseudo-code, where <tt class="literal"><span class="pre">V</span></tt> is
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<tt class="literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt></p>
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<pre class="literal-block">
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if (Value is use_default) then
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typedef iterator_traits<V>::value_type value_type;
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typedef remove_const<pointee<V>::type>::type value_type;
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else
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typedef remove_const<Value>::type value_type;
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if (Reference is use_default) then
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typedef iterator_traits<V>::reference reference;
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if (Value is use_default) then
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typedef indirect_reference<V>::type reference;
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else
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typedef Value& reference;
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else
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typedef Reference reference;
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typedef Value* pointer;
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if (Value is use_default) then
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typedef pointee<V>::type* pointer;
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else
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typedef Value* pointer;
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if (Difference is use_default)
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typedef iterator_traits<Iterator>::difference_type difference_type;
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else
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typedef Difference difference_type;
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if (CategoryOrTraversal is use_default)
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typedef <em>iterator-category</em> (
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iterator_traversal<Iterator>::type,``reference``,``value_type``
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) iterator_category;
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else
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typedef <em>iterator-category</em> (
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CategoryOrTraversal,``reference``,``value_type``
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) iterator_category;
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</pre>
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<p>The member <tt class="literal"><span class="pre">indirect_iterator::iterator_category</span></tt> is a type that
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satisfies the requirements of the concepts modeled by the indirect
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iterator as specified in the models section.</p>
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<div class="section" id="indirect-iterator-requirements">
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<h1><a name="indirect-iterator-requirements"><tt class="literal"><span class="pre">indirect_iterator</span></tt> requirements</a></h1>
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<p>The <tt class="literal"><span class="pre">Iterator</span></tt> argument shall meet the requirements of Readable
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Iterator. The <tt class="literal"><span class="pre">CategoryOrTraversal</span></tt> argument shall be one of the
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standard iterator tags or <tt class="literal"><span class="pre">use_default</span></tt>. If <tt class="literal"><span class="pre">CategoryOrTraversal</span></tt>
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is an iterator tag, the template parameter <tt class="literal"><span class="pre">Iterator</span></tt> argument shall
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meet the traversal requirements corresponding to the iterator tag.</p>
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<p>The expression <tt class="literal"><span class="pre">*v</span></tt>, where <tt class="literal"><span class="pre">v</span></tt> is an object of type
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<tt class="literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>, must be a valid expression
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and must be convertible to <tt class="literal"><span class="pre">indirect_iterator::reference</span></tt>. Also,
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there are further requirements on the
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<tt class="literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt> if the <tt class="literal"><span class="pre">Value</span></tt> parameter
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is not <tt class="literal"><span class="pre">use_default</span></tt>, as implied by the algorithm for deducing the
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default for the <tt class="literal"><span class="pre">value_type</span></tt> member.</p>
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<p>The expression <tt class="literal"><span class="pre">*v</span></tt>, where <tt class="literal"><span class="pre">v</span></tt> is an object of
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<tt class="literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>, shall be valid
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expression and convertible to <tt class="literal"><span class="pre">reference</span></tt>. <tt class="literal"><span class="pre">Iterator</span></tt> shall
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model the traversal concept indicated by <tt class="literal"><span class="pre">iterator_category</span></tt>.
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<tt class="literal"><span class="pre">Value</span></tt>, <tt class="literal"><span class="pre">Reference</span></tt>, and <tt class="literal"><span class="pre">Difference</span></tt> shall be chosen so
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that <tt class="literal"><span class="pre">value_type</span></tt>, <tt class="literal"><span class="pre">reference</span></tt>, and <tt class="literal"><span class="pre">difference_type</span></tt> meet
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the requirements indicated by <tt class="literal"><span class="pre">iterator_category</span></tt>.</p>
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<p>[Note: there are further requirements on the
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<tt class="literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt> if the <tt class="literal"><span class="pre">Value</span></tt>
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parameter is not <tt class="literal"><span class="pre">use_default</span></tt>, as implied by the algorithm for
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deducing the default for the <tt class="literal"><span class="pre">value_type</span></tt> member.]</p>
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</div>
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<div class="section" id="indirect-iterator-models">
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<h1><a name="indirect-iterator-models"><tt class="literal"><span class="pre">indirect_iterator</span></tt> models</a></h1>
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<p>If <tt class="literal"><span class="pre">CategoryOrTraversal</span></tt> is a standard iterator tag,
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<tt class="literal"><span class="pre">indirect_iterator</span></tt> is a model of the iterator concept corresponding
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to the tag, otherwise <tt class="literal"><span class="pre">indirect_iterator</span></tt> satisfies the requirements
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of the most refined standard traversal concept that is satisfied by
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the <tt class="literal"><span class="pre">Iterator</span></tt> argument.</p>
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<p><tt class="literal"><span class="pre">indirect_iterator</span></tt> models Readable Iterator. If
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<tt class="literal"><span class="pre">indirect_iterator::reference(*v)</span> <span class="pre">=</span> <span class="pre">t</span></tt> is a valid expression (where
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<tt class="literal"><span class="pre">t</span></tt> is an object of type <tt class="literal"><span class="pre">indirect_iterator::value_type</span></tt>) then
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<tt class="literal"><span class="pre">indirect_iterator</span></tt> models Writable Iterator. If
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<tt class="literal"><span class="pre">indirect_iterator::reference</span></tt> is a reference then
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<tt class="literal"><span class="pre">indirect_iterator</span></tt> models Lvalue Iterator.</p>
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<p>In addition to the concepts indicated by <tt class="literal"><span class="pre">iterator_category</span></tt>
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and by <tt class="literal"><span class="pre">iterator_traversal<indirect_iterator>::type</span></tt>, a
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specialization of <tt class="literal"><span class="pre">indirect_iterator</span></tt> models the following
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concepts, Where <tt class="literal"><span class="pre">v</span></tt> is an object of
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<tt class="literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>:</p>
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<blockquote>
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<ul class="simple">
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<li>Readable Iterator if <tt class="literal"><span class="pre">reference(*v)</span></tt> is convertible to
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<tt class="literal"><span class="pre">value_type</span></tt>.</li>
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<li>Writable Iterator if <tt class="literal"><span class="pre">reference(*v)</span> <span class="pre">=</span> <span class="pre">t</span></tt> is a valid
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expression (where <tt class="literal"><span class="pre">t</span></tt> is an object of type
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<tt class="literal"><span class="pre">indirect_iterator::value_type</span></tt>)</li>
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<li>Lvalue Iterator if <tt class="literal"><span class="pre">reference</span></tt> is a reference type.</li>
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</ul>
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</blockquote>
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<p><tt class="literal"><span class="pre">indirect_iterator<X,V1,C1,R1,D1></span></tt> is interoperable with
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<tt class="literal"><span class="pre">indirect_iterator<Y,V2,C2,R2,D2></span></tt> if and only if <tt class="literal"><span class="pre">X</span></tt> is
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interoperable with <tt class="literal"><span class="pre">Y</span></tt>.</p>
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</div>
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<div class="section" id="indirect-iterator-operations">
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<h1><a name="indirect-iterator-operations"><tt class="literal"><span class="pre">indirect_iterator</span></tt> operations</a></h1>
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<p>In addition to the operations required by the concepts described
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above, specializations of <tt class="literal"><span class="pre">indirect_iterator</span></tt> provide the
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following operations.</p>
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<p><tt class="literal"><span class="pre">indirect_iterator();</span></tt></p>
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<table class="field-list" frame="void" rules="none">
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<col class="field-name" />
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@ -103,8 +131,8 @@ the <tt class="literal"><span class="pre">Iterator</span></tt> argument.</p>
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<tbody valign="top">
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<tr class="field"><th class="field-name">Requires:</th><td class="field-body"><tt class="literal"><span class="pre">Iterator</span></tt> must be Default Constructible.</td>
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</tr>
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body">An instance of <tt class="literal"><span class="pre">indirect_iterator</span></tt> with
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a default-constructed <tt class="literal"><span class="pre">iterator_adaptor</span></tt> subobject.</td>
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body">Constructs an instance of <tt class="literal"><span class="pre">indirect_iterator</span></tt> with
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a default-constructed <tt class="literal"><span class="pre">m_iterator</span></tt>.</td>
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</tr>
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</tbody>
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</table>
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@ -113,8 +141,8 @@ a default-constructed <tt class="literal"><span class="pre">iterator_adaptor</sp
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body">An instance of <tt class="literal"><span class="pre">indirect_iterator</span></tt> with
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the <tt class="literal"><span class="pre">iterator_adaptor</span></tt> subobject copy constructed from <tt class="literal"><span class="pre">x</span></tt>.</td>
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body">Constructs an instance of <tt class="literal"><span class="pre">indirect_iterator</span></tt> with
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<tt class="literal"><span class="pre">m_iterator</span></tt> copy constructed from <tt class="literal"><span class="pre">x</span></tt>.</td>
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</tr>
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</tbody>
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</table>
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@ -136,12 +164,57 @@ indirect_iterator(
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<tbody valign="top">
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<tr class="field"><th class="field-name">Requires:</th><td class="field-body"><tt class="literal"><span class="pre">Iterator2</span></tt> is implicitly convertible to <tt class="literal"><span class="pre">Iterator</span></tt>.</td>
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</tr>
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body">An instance of <tt class="literal"><span class="pre">indirect_iterator</span></tt> whose
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<tt class="literal"><span class="pre">iterator_adaptor</span></tt> subobject is constructed from <tt class="literal"><span class="pre">y.base()</span></tt>.</td>
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body">Constructs an instance of <tt class="literal"><span class="pre">indirect_iterator</span></tt> whose
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<tt class="literal"><span class="pre">m_iterator</span></tt> subobject is constructed from <tt class="literal"><span class="pre">y.base()</span></tt>.</td>
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</tr>
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</tbody>
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</table>
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<p><tt class="literal"><span class="pre">Iterator</span> <span class="pre">const&</span> <span class="pre">base()</span> <span class="pre">const;</span></tt></p>
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<table class="field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="literal"><span class="pre">m_iterator</span></tt></td>
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</tr>
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</tbody>
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</table>
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<p><tt class="literal"><span class="pre">reference</span> <span class="pre">operator*()</span> <span class="pre">const;</span></tt></p>
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<table class="field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="literal"><span class="pre">**m_iterator</span></tt></td>
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</tr>
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</tbody>
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</table>
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<p><tt class="literal"><span class="pre">indirect_iterator&</span> <span class="pre">operator++();</span></tt></p>
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<table class="field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body"><tt class="literal"><span class="pre">++m_iterator</span></tt></td>
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</tr>
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="literal"><span class="pre">*this</span></tt></td>
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</tr>
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</tbody>
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</table>
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<p><tt class="literal"><span class="pre">indirect_iterator&</span> <span class="pre">operator--();</span></tt></p>
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<table class="field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body"><tt class="literal"><span class="pre">--m_iterator</span></tt></td>
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</tr>
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="literal"><span class="pre">*this</span></tt></td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<hr class="footer" />
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<div class="footer">
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<a class="reference" href="indirect_iterator_ref.rst">View document source</a>.
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