321 lines
23 KiB
HTML
321 lines
23 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::experimental::propagate_const</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_propagate_const skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::</span>propagate_const</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/propagate_const&action=edit&redlink=1" class="new" title="cpp/header/experimental/propagate const（页面不存在）"><experimental/propagate_const></a></code></div>
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<tr class="t-dcl t-since-libfund_ts_2">
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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> T<span class="sy1">></span><br />
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<span class="kw1">class</span> propagate_const<span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<p><code>std::experimental::propagate_const</code> 是为指针和仿指针对象传播 const 的包装器。如名所示，在通过 <code>const</code> 访问路径访问时，它把被包装指针当做指向 <code>const</code> 的指针。</p>
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<p>若底层的仿指针类型类满足<a href="cpp-named_req-MoveConstructible.html"><span style="font-style:italic">可移动构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveConstructible)</span></a> 和<a href="cpp-named_req-MoveAssignable.html"><span style="font-style:italic">可移动赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveAssignable)</span></a> 的要求，则该类满足对应概念，但 <code>propagate_const</code> 既非<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">可复制构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span></a> 亦非<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">可复制赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span></a> 。</p>
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<table class="t-par-begin">
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<tr class="t-par-hitem">
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<td colspan="3">类型要求</td>
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</tr>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>T</code> 必须是下面指定的对象指针类型或仿指针类型。若 <code>T</code> 为数组类型、引用类型、指向函数指针类型、指向（可为 cv 限定的） <code>void</code> 指针类型，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">decltype<span class="br0">(</span><span class="sy2">*</span><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1"><</span>T<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 不是左值引用类型，则程序为病式。</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E4.BB.BF.E6.8C.87.E9.92.88.E7.B1.BB.E5.9E.8B.E4.B8.8A.E7.9A.84.E8.A6.81.E6.B1.82">仿指针类型上的要求</span></h3>
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<p>若 <code>T</code> 为类类型，则它必须满足此节中的要求。</p>
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<p>给定</p>
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<ul>
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<li><code>t</code> ， <code>T</code> 类型的可修改<a href="cpp-language-value_category.html">左值表达式</a></li>
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<li><code>ct</code> ，绑定到 <code>T</code> 的 <code>const T&</code></li>
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<li><code>element_type</code> ，对象类型</li>
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</ul>
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<p>下列表达式必须合法并拥有其指定的效果：</p>
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<table class="wikitable">
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<tr>
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<th>表达式</th>
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<th>返回类型</th>
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<th>前提条件</th>
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<th>操作语义</th>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><code>element_type*</code></td>
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<td></td>
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<td></td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">ct.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><code>element_type*</code> 或 <code>const element_type*</code></td>
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<td></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> ct.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>t</span></span></td>
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<td><code>element_type&</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> nullptr</span></span></td>
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<td><code>*t</code> 与 <code>*(t.get())</code> 指代同一对象</td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>ct</span></span></td>
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<td><code>element_type&</code> 或 <code>const element_type&</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">ct.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> nullptr</span></span></td>
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<td><code>*ct</code> 与 <code>*(ct.get())</code> 指代同一对象</td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><code>element_type*</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> nullptr</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> t.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">ct.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><code>element_type*</code> 或 <code>const element_type*</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">ct.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> nullptr</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">ct.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> ct.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span>t</span></span></td>
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<td><code>bool</code></td>
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<td></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span>t</span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> nullptr</span></span></td>
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</tr>
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<tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span>ct</span></span></td>
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<td><code>bool</code></td>
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<td></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span>ct</span></span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">ct.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> nullptr</span></span></td>
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</tr>
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</table>
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<p>还有， <code>T</code> 和 <code>const T</code> 应当可按语境转换为 <code>bool</code> 。</p>
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<p>另外，若 <code>T</code> 可隐式转换为 <code>element_type*</code> ，则 <code>(element_type*)t</code> 应当等于 <code>t.get()</code> 。类似地，若 <code>const T</code> 可隐式转换为 <code>const element_type*</code> ，则 <code>(const element_type*)ct</code> 应当等于 <code>ct.get()</code> 。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>成员类型</td>
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<td>定义</td>
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</tr>
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<tr class="t-dsc">
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span><span class="sy2">*</span><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1"><</span>T<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy1">></span></span></span> ， <code>T</code> 所指向对象的类型</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-experimental-propagate_const-propagate_const.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造新的 <code>propagate_const</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><span class="t-lines"><span>(析构函数)</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div>
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</div>
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</td>
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<td>销毁 <code>propagate_const</code> 并销毁所含指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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</div>
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</td>
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<td>赋值 <code>propagate_const</code> 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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</div>
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</td>
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<td>交换被包装指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.A7.82.E5.AF.9F.E5.99.A8">观察器</span></h5>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-get.html"><span class="t-lines"><span>get</span></span></a></div>
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</div>
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</td>
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<td>返回指向被包装指针所指向对象的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-operator_bool.html"><span class="t-lines"><span>operator bool</span></span></a></div>
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</div>
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</td>
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<td>检查被包装指针是否为空<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-operator*.html"><span class="t-lines"><span>operator*</span><span>operator-></span></span></a></div>
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</div>
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</td>
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<td>解引用被包装指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-operator_element_type*.html"><span class="t-lines"><span>operator element_type*</span><span>operator const element_type*</span></span></a></div>
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</div>
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</td>
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<td>到指针的隐式转换函数<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span></span></a></div>
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</div>
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</td>
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<td>与另一 <code>propagate_const</code> 、另一指针，或与 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> 比较<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-swap2.html"><span class="t-lines"><span>std::experimental::swap<span class="t-dsc-small">(std::experimental::propagate_const)</span></span></span></a></div>
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</div>
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</td>
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<td>特化 <code>swap</code> 算法<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-get_underlying.html"><span class="t-lines"><span>get_underlying</span></span></a></div>
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</div>
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</td>
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<td>获取到被包装仿指针对象的引用<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-hash.html"><span class="t-lines"><span>std::hash<span class="t-dsc-small"><std::experimental::propagate_const></span></span></span></a></div>
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</div>
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</td>
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<td><code>propagate_const</code> 的哈希支持<br />
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<span class="t-mark">(类模板特化)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-propagate_const-cmp_func.html"><span class="t-lines"><span>std::equal_to<span class="t-dsc-small"><std::experimental::propagate_const></span></span><span>std::not_equal_to<span class="t-dsc-small"><std::experimental::propagate_const></span></span><span>std::less<span class="t-dsc-small"><std::experimental::propagate_const></span></span><span>std::greater<span class="t-dsc-small"><std::experimental::propagate_const></span></span><span>std::less_equal<span class="t-dsc-small"><std::experimental::propagate_const></span></span><span>std::greater_equal<span class="t-dsc-small"><std::experimental::propagate_const></span></span></span></a></div>
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</div>
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</td>
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<td>标准比较函数对象对 <code>propagate_const</code> 的特化<br />
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<span class="t-mark">(类模板特化)</span></td>
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</tr>
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</table>
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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="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <memory></span>
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<span class="co2">#include <experimental/propagate_const></span>
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<span class="kw1">struct</span> X
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<span class="br0">{</span>
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<span class="kw4">void</span> g<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"g (const)<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">void</span> g<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> <a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"g (non-const)<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">struct</span> Y
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<span class="br0">{</span>
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Y<span class="br0">(</span><span class="br0">)</span> <span class="sy4">:</span> m_ptrX<span class="br0">(</span><a href="cpp-memory-unique_ptr-make_unique.html"><span class="kw735">std::<span class="me2">make_unique</span></span></a><span class="sy1"><</span>X<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span> <span class="br0">}</span>
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<span class="kw4">void</span> f<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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<span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"f (const)<span class="es1">\n</span>"</span><span class="sy4">;</span>
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m_ptrX<span class="sy2">-</span><span class="sy1">></span>g<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">void</span> f<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"f (non-const)<span class="es1">\n</span>"</span><span class="sy4">;</span>
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m_ptrX<span class="sy2">-</span><span class="sy1">></span>g<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">propagate_const</span><span class="sy1"><</span><a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1"><</span>X<span class="sy1">>></span> m_ptrX<span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</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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Y y<span class="sy4">;</span>
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y.<span class="me1">f</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">const</span> Y cy<span class="sy4">;</span>
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cy.<span class="me1">f</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">f (non-const)
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g (non-const)
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f (const)
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g (const)</pre></div>
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</div>
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</div>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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