79 lines
7.8 KiB
HTML
79 lines
7.8 KiB
HTML
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<title>C++ 具名要求：老式连续迭代器 (LegacyContiguousIterator)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">C++ 具名要求：</span><span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-named_req.html">named req</a></span></div>
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<p><strong class="selflink"><span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span></strong> 是<a href="cpp-named_req-Iterator.html"><span style="font-style:italic">老式迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyIterator)</span></a> ，其所指向的逻辑相邻元素也在内存中物理上相邻。</p>
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<p>指向数组元素的指针满足<span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span> 的所有要求。</p>
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<h3><span class="mw-headline" id=".E8.A6.81.E6.B1.82">要求</span></h3>
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<p>以下情况下，类型 <code>It</code> 满足<span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span></p>
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<ul>
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<li>类型 <code>It</code> 满足<a href="cpp-named_req-Iterator.html"><span style="font-style:italic">老式迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyIterator)</span></a></li>
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</ul>
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<p>并且，对于每个</p>
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<ul>
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<li><code>a</code>，为 <code>It</code> 类型的可解引用迭代器</li>
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<li><code>n</code>，为整型值</li>
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</ul>
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<p>使得</p>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">a <span class="sy2">+</span> n</span></span> 为有效的可解引用迭代器值</li>
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</ul>
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<p>则</p>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span><span class="br0">(</span>a <span class="sy2">+</span> n<span class="br0">)</span></span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span><span class="br0">(</span><a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span><span class="sy2">*</span>a<span class="br0">)</span> <span class="sy2">+</span> n<span class="br0">)</span></span></span>。</li>
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</ul>
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<h3><span class="mw-headline" id=".E6.A0.87.E5.87.86.E5.BA.93">标准库</span></h3>
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<p>下列标准库类型是<strong class="selflink"><span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span></strong> 。</p>
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<ul>
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<li><a href="cpp-container-array.html"><tt>array::iterator</tt></a>。</li>
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<li><a href="cpp-string-basic_string_view.html"><tt>basic_string_view::iterator</tt></a>。</li>
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<li><a href="cpp-string-basic_string.html"><tt>basic_string::iterator</tt></a>。</li>
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<li><a href="cpp-container-vector.html"><tt>vector::iterator</tt></a>，对于除 <span class="t-lc">bool</span> 以外的 <span class="t-lc">value_type</span>。</li>
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<li><a href="cpp-numeric-valarray-begin2.html"><tt>begin<span class="t-dsc-small">(valarray)</span></tt></a> 和 <a href="cpp-numeric-valarray-end2.html"><tt>end<span class="t-dsc-small">(valarray)</span></tt></a> 的返回类型。</li>
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</ul>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>亦要求指向对象类型的<a href="cpp-named_req-Allocator.html#.E7.BC.80.E9.A5.B0.E6.8C.87.E9.92.88">缀饰指针</a>满足<span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span> 。</p>
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<table class="t-rev-begin">
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<tr class="t-rev t-since-cxx20">
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<td>
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<p><span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span> 被 <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a> 概念代替：标准库中在 C++17 中被要求满足<span style="font-style:italic">老式连续迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyContiguousIterator)</span> 的迭代器类型在 C++20 中亦被要求实现 <code>contiguous_iterator</code> 。</p>
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</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-contiguous_iterator.html"><span class="t-lines"><span>contiguous_iterator</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>指定 <a href="cpp-iterator-random_access_iterator.html"><code>random_access_iterator</code></a> 为连续迭代器，指代内存中连续相接的元素<br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td><a href="cpp-iterator.html"><b>迭代器库</b></a></td>
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<td>提供迭代器的定义、迭代器表征、适配器及工具函数</td>
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</tr>
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</table>
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</div>
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