113 lines
8.3 KiB
HTML
113 lines
8.3 KiB
HTML
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<title>std::incrementable_traits<std::common_iterator></title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_common_iterator_incrementable_traits skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>incrementable_traits<small><std::common_iterator></small></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a>‎ | <a href="cpp-iterator-common_iterator.html">common iterator</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-iterator.html"><iterator></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> I, <span class="kw1">class</span> S <span class="sy1">></span><br /></span>
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<p><span class="kw1">struct</span> incrementable_traits<span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1"><</span>I, S<span class="sy1">>></span> <span class="br0">{</span><br />
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<span class="kw1">using</span> difference_type <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span><br /></p>
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<span class="br0">}</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>对提供访问 <span class="t-lc">std::common_iterator</span> 类型的差类型提供统一接口。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <list></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <cstddef></span>
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<span class="co2">#include <iterator></span>
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<span class="co2">#include <type_traits></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">using</span> CI <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1"><</span>
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std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1"><</span><span class="kw4">int</span><span class="sy2">*</span><span class="sy1">></span>,
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std<span class="sy4">::</span><span class="me2">default_sentinel_t</span>
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<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">using</span> CL <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1"><</span>
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std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1"><</span><a href="cpp-container-list.html"><span class="kw1275">std::<span class="me2">list</span></span></a><span class="sy1"><</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">></span>,
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std<span class="sy4">::</span><span class="me2">default_sentinel_t</span>
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<span class="sy1">></span><span class="sy4">;</span>
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CL cl <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">}</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span>
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std<span class="sy4">::</span><span class="me2">same_as</span><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">incrementable_traits</span><span class="sy1"><</span>CI<span class="sy1">></span><span class="sy4">::</span><span class="me2">difference_type</span>, <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a><span class="sy1">></span> <span class="sy3">&&</span>
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std<span class="sy4">::</span><span class="me2">same_as</span><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">incrementable_traits</span><span class="sy1"><</span>CL<span class="sy1">></span><span class="sy4">::</span><span class="me2">difference_type</span>, <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a><span class="sy1">></span> <span class="sy3">&&</span>
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std<span class="sy4">::</span><span class="me2">same_as</span><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">incrementable_traits</span><span class="sy1"><</span>decltype<span class="br0">(</span>cl<span class="br0">)</span><span class="sy1">></span><span class="sy4">::</span><span class="me2">difference_type</span>, <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a><span class="sy1">></span>
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<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-incrementable_traits.html"><span class="t-lines"><span>incrementable_traits</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>计算 <a href="cpp-iterator-weakly_incrementable.html"><code>weakly_incrementable</code></a> 类型的差类型<br />
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<span class="t-mark">(类模板)</span></td>
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<div><a href="cpp-iterator-iter_t.html"><span class="t-lines"><span>iter_value_t</span><span>iter_reference_t</span><span>iter_difference_t</span><span>iter_rvalue_reference_t</span><span>iter_common_reference_t</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>计算迭代器的关联类型<br />
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<span class="t-mark">(别名模板)</span></td>
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<div><a href="cpp-iterator-common_iterator-iterator_traits.html"><span class="t-lines"><span>std::iterator_traits<span class="t-dsc-small"><std::common_iterator></span></span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>对 <span class="t-lc">std::counted_iterator</span> 类型的属性提供均一的接口<br />
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<span class="t-mark">(类模板特化)</span></td>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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