142 lines
12 KiB
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142 lines
12 KiB
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<title>std::map<Key,T,Compare,Allocator>::merge</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_container_map_merge skin-cppreference2 action-view cpp-page-template cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::map<Key,T,Compare,Allocator>::</span>merge</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-container.html">container</a>‎ | <a href="cpp-container-map.html">map</a></span></div>
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<div class="t-page-template" style="">
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<p></p>
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<table class="t-dcl-begin">
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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> C2<span class="sy1">></span><br />
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<span class="kw4">void</span> merge<span class="br0">(</span> <a href="cpp-container-map.html"><span class="kw1281">std::<span class="me2">map</span></span></a><span class="sy1"><</span>Key, T, C2, Allocator<span class="sy1">></span><span class="sy3">&</span> source <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx17">
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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> C2<span class="sy1">></span><br />
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<span class="kw4">void</span> merge<span class="br0">(</span> <a href="cpp-container-map.html"><span class="kw1281">std::<span class="me2">map</span></span></a><span class="sy1"><</span>Key, T, C2, Allocator<span class="sy1">></span><span class="sy3">&&</span> source <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx17">
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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> C2<span class="sy1">></span><br />
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<span class="kw4">void</span> merge<span class="br0">(</span> <a href="cpp-container-multimap.html"><span class="kw1285">std::<span class="me2">multimap</span></span></a><span class="sy1"><</span>Key, T, C2, Allocator<span class="sy1">></span><span class="sy3">&</span> source <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx17">
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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> C2<span class="sy1">></span><br />
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<span class="kw4">void</span> merge<span class="br0">(</span> <a href="cpp-container-multimap.html"><span class="kw1285">std::<span class="me2">multimap</span></span></a><span class="sy1"><</span>Key, T, C2, Allocator<span class="sy1">></span><span class="sy3">&&</span> source <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>试图提取（“接合”） <code>source</code> 中每个元素，并用 <code>*this</code> 的比较对象插入到 <code>*this</code> 。 若 <code>*this</code> 中有元素，其键等价于来自 <code>source</code> 中元素的键，则不从 <code>source</code> 提取该元素。 不复制或移动元素，只会重指向容器结点的内部指针。指向被转移元素的所有指针和引用保持合法，但现在指代到 <code>*this</code> 中而非到 <code>source</code> 中。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">get_allocator<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> source.<span class="me1">get_allocator</span><span class="br0">(</span><span class="br0">)</span></span></span> 则行为未定义。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>source</td>
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<td>-</td>
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<td>传递结点来源的兼容容器</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>（无）</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛异常，除非比较抛出。</p>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>N*log(size()+N)) ，其中 N 为 <code>source.size()</code> 。</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="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 <map></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <string></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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<a href="cpp-container-map.html"><span class="kw1281">std::<span class="me2">map</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> ma <span class="br0">{</span><span class="br0">{</span><span class="nu0">1</span>, <span class="st0">"apple"</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">5</span>, <span class="st0">"pear"</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">10</span>, <span class="st0">"banana"</span><span class="br0">}</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-map.html"><span class="kw1281">std::<span class="me2">map</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> mb <span class="br0">{</span><span class="br0">{</span><span class="nu0">2</span>, <span class="st0">"zorro"</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">4</span>, <span class="st0">"batman"</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">5</span>, <span class="st0">"X"</span><span class="br0">}</span>, <span class="br0">{</span><span class="nu0">8</span>, <span class="st0">"alpaca"</span><span class="br0">}</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-map.html"><span class="kw1281">std::<span class="me2">map</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> u<span class="sy4">;</span>
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u.<span class="me1">merge</span><span class="br0">(</span>ma<span class="br0">)</span><span class="sy4">;</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">"ma.size(): "</span> <span class="sy1"><<</span> ma.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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u.<span class="me1">merge</span><span class="br0">(</span>mb<span class="br0">)</span><span class="sy4">;</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">"mb.size(): "</span> <span class="sy1"><<</span> mb.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</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">"mb.at(5): "</span> <span class="sy1"><<</span> mb.<span class="me1">at</span><span class="br0">(</span><span class="nu0">5</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="kw1">for</span><span class="br0">(</span><span class="kw4">auto</span> <span class="kw4">const</span> <span class="sy3">&</span>kv<span class="sy4">:</span> u<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> kv.<span class="me1">first</span> <span class="sy1"><<</span> <span class="st0">", "</span> <span class="sy1"><<</span> kv.<span class="me1">second</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</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">ma.size(): 0
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mb.size(): 1
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mb.at(5): X
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1, apple
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2, zorro
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4, batman
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5, pear
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8, alpaca
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10, banana</pre></div>
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</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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<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-container-map-extract.html"><span class="t-lines"><span>extract</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</div>
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</td>
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<td>从另一容器释出结点<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-container-map-insert.html"><span class="t-lines"><span>insert</span></span></a></div>
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</div>
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</td>
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<td>插入元素<span class="t-rev-inl t-since-cxx17"><span>或结点</span> <span><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></span><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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</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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