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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>make_unique, <span style="font-size:0.7em; line-height:130%">std::</span>make_unique_for_overwrite</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-memory.html">memory</a>&lrm; | <a href="cpp-memory-unique_ptr.html">unique ptr</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-memory.html">&lt;memory&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">&gt;</span><br />
unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> make_unique<span class="br0">(</span> Args<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark">(&#20165;&#23545;&#38750;&#25968;&#32452;&#31867;&#22411;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> make_unique<span class="br0">(</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark">(&#20165;&#23545;&#26410;&#30693;&#36793;&#30028;&#25968;&#32452;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">&gt;</span><br />
<span class="coMULTI">/* unspecified */</span> make_unique<span class="br0">(</span> Args<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark">(&#20165;&#23545;&#24050;&#30693;&#36793;&#30028;&#25968;&#32452;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T &nbsp;<span class="sy1">&gt;</span><br />
unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> make_unique_for_overwrite<span class="br0">(</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span><br />
<span class="t-mark">(&#20165;&#23545;&#38750;&#25968;&#32452;&#31867;&#22411;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br />
unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> make_unique_for_overwrite<span class="br0">(</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span><br />
<span class="t-mark">(&#20165;&#23545;&#26410;&#30693;&#36793;&#30028;&#25968;&#32452;)</span></td>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">&gt;</span><br />
<span class="coMULTI">/* unspecified */</span> make_unique_for_overwrite<span class="br0">(</span> Args<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
</td>
<td>(6)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span><br />
<span class="t-mark">(&#20165;&#23545;&#24050;&#30693;&#36793;&#30028;&#25968;&#32452;)</span></td>
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<p>&#26500;&#36896; <code>T</code> &#31867;&#22411;&#23545;&#35937;&#24182;&#23558;&#20854;&#21253;&#35013;&#36827; <span class="t-lc"><a href="cpp-memory-unique_ptr.html">std::unique_ptr</a></span> &#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#26500;&#36896;&#38750;&#25968;&#32452;&#31867;&#22411; <code>T</code> &#23545;&#35937;&#12290;&#20256;&#36882;&#21442;&#25968; <code>args</code> &#32473; <code>T</code> &#30340;&#26500;&#36896;&#20989;&#25968;&#12290;&#27492;&#37325;&#36733;&#20165;&#33509; <code>T</code> &#19981;&#26159;&#25968;&#32452;&#31867;&#22411;&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;&#20989;&#25968;&#31561;&#20215;&#20110;&#65306;
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<div class="cpp source-cpp">
<pre class="de1">unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new T<span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1116">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Args<span class="sy1">&gt;</span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span><span class="br0">)</span></pre></div>
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</div>
<div class="t-li1"><span class="t-li">2)</span> &#26500;&#36896;&#25317;&#26377;&#21160;&#24577;&#22823;&#23567;&#30340;&#25968;&#32452;&#12290;<a href="cpp-language-value_initialization.html">&#20540;&#21021;&#22987;&#21270;</a>&#25968;&#32452;&#20803;&#32032;&#12290;&#27492;&#37325;&#36733;&#20165;&#33509; <code>T</code> &#26159;&#26410;&#30693;&#36793;&#30028;&#25968;&#32452;&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;&#20989;&#25968;&#31561;&#20215;&#20110;&#65306;
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<div class="cpp source-cpp">
<pre class="de1">unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new <a href="cpp-types-remove_extent.html"><span class="kw621">std::<span class="me2">remove_extent_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">[</span>size<span class="br0">]</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></pre></div>
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<div class="t-li1"><span class="t-li">3,6)</span> &#19981;&#20801;&#35768;&#26500;&#36896;&#24050;&#30693;&#36793;&#30028;&#30340;&#25968;&#32452;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#38500;&#20102;<a href="cpp-language-default_initialization.html">&#40664;&#35748;&#21021;&#22987;&#21270;</a>&#23545;&#35937;&#12290;&#27492;&#37325;&#36733;&#20165;&#33509; <code>T</code> &#19981;&#26159;&#25968;&#32452;&#31867;&#22411;&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;&#20989;&#25968;&#31561;&#20215;&#20110;&#65306;
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<div class="cpp source-cpp">
<pre class="de1">unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new T<span class="br0">)</span></pre></div>
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<div class="t-li1"><span class="t-li">5)</span> &#21516; <span class="t-v">(2)</span> &#65292;&#38500;&#20102;&#40664;&#35748;&#21021;&#22987;&#21270;&#25968;&#32452;&#12290;&#27492;&#37325;&#36733;&#20165;&#33509; <code>T</code> &#26159;&#26410;&#30693;&#36793;&#30028;&#25968;&#32452;&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;&#20989;&#25968;&#31561;&#20215;&#20110;&#65306;
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<div class="cpp source-cpp">
<pre class="de1">unique_ptr<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new <a href="cpp-types-remove_extent.html"><span class="kw621">std::<span class="me2">remove_extent_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">[</span>size<span class="br0">]</span><span class="br0">)</span></pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
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<td>args</td>
<td>-</td>
<td>&#23558;&#35201;&#26500;&#36896;&#30340; <code>T</code> &#23454;&#20363;&#25152;&#29992;&#30340;&#21442;&#25968;&#21015;&#34920;&#12290;</td>
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<tr class="t-par">
<td>size</td>
<td>-</td>
<td>&#35201;&#26500;&#36896;&#30340;&#25968;&#32452;&#22823;&#23567;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#31867;&#22411; <code>T</code> &#23454;&#20363;&#30340; <span class="t-lc"><a href="cpp-memory-unique_ptr.html">std::unique_ptr</a></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986; <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> &#25110;&#20219;&#20309; <code>T</code> &#30340;&#26500;&#36896;&#20989;&#25968;&#25152;&#25243;&#30340;&#24322;&#24120;&#12290;&#33509;&#25243;&#20986;&#24322;&#24120;&#65292;&#21017;&#27492;&#20989;&#25968;&#26080;&#25928;&#26524;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">&#21487;&#33021;&#30340;&#23454;&#29616;</span></h3>
<table class="eq-fun-cpp-table">
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<th>&#29256;&#26412;&#19968;</th>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co1">// C++14 make_unique</span>
<span class="kw1">namespace</span> detail <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_unbounded_array_v <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_unbounded_array_v<span class="sy1">&lt;</span>T<span class="br0">[</span><span class="br0">]</span><span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_bounded_array_v <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> N<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_bounded_array_v<span class="sy1">&lt;</span>T<span class="br0">[</span>N<span class="br0">]</span><span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="br0">}</span> <span class="co1">// namespace detail</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span><span class="sy1">&gt;</span>
<a href="cpp-types-enable_if.html"><span class="kw631">std::<span class="me2">enable_if_t</span></span></a><span class="sy1">&lt;</span><span class="sy3">!</span><a href="cpp-types-is_array.html"><span class="kw460">std::<span class="me2">is_array</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span>, <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span>
make_unique<span class="br0">(</span>Args<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new T<span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1116">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Args<span class="sy1">&gt;</span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
<a href="cpp-types-enable_if.html"><span class="kw631">std::<span class="me2">enable_if_t</span></span></a><span class="sy1">&lt;</span>detail<span class="sy4">::</span><span class="me2">is_unbounded_array_v</span><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>, <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span>
make_unique<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> n<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new <a href="cpp-types-remove_extent.html"><span class="kw621">std::<span class="me2">remove_extent_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">[</span>n<span class="br0">]</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span><span class="sy1">&gt;</span>
<a href="cpp-types-enable_if.html"><span class="kw631">std::<span class="me2">enable_if_t</span></span></a><span class="sy1">&lt;</span>detail<span class="sy4">::</span><span class="me2">is_bounded_array_v</span><span class="sy1">&lt;</span>T<span class="sy1">&gt;&gt;</span> make_unique<span class="br0">(</span>Args<span class="sy3">&amp;&amp;</span>...<span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></pre></div>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co1">// C++20 make_unique_for_overwrite</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
requires <span class="sy3">!</span><a href="cpp-types-is_array.html"><span class="kw461">std::<span class="me2">is_array_v</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> make_unique_for_overwrite<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new T<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">is_unbounded_array_v</span><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> make_unique_for_overwrite<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> n<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">(</span>new <a href="cpp-types-remove_extent.html"><span class="kw621">std::<span class="me2">remove_extent_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span><span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">is_bounded_array_v</span><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span>
<span class="kw4">void</span> make_unique_for_overwrite<span class="br0">(</span>Args<span class="sy3">&amp;&amp;</span>...<span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></pre></div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#19981;&#21516;&#20110; <span class="t-lc"><a href="cpp-memory-shared_ptr-make_shared.html">std::make_shared</a></span> &#65288;&#23427;&#25317;&#26377; <span class="t-lc"><a href="cpp-memory-shared_ptr-allocate_shared.html">std::allocate_shared</a></span> &#65289;&#65292; <code>std::make_unique</code> &#27809;&#26377;&#20855;&#20998;&#37197;&#22120;&#30340;&#23545;&#24212;&#29289;&#12290; <a rel="nofollow" class="external text" href="https://wg21.link/P0211">P0211</a> &#20013;&#25552;&#26696;&#30340; <code>allocate_unique</code> &#20250;&#35201;&#27714;&#20026;&#20854;&#36820;&#22238;&#30340; <code>unique_ptr&lt;T,D&gt;</code> &#21019;&#20316;&#21024;&#38500;&#22120;&#31867;&#22411; <code>D</code> &#65292;&#36820;&#22238;&#31867;&#22411;&#21487;&#33021;&#21547;&#26377;&#20998;&#37197;&#22120;&#23545;&#35937;&#65292;&#24182;&#22312;&#20854; <code>operator()</code> &#35843;&#29992; <code>destroy</code> &#21644; <code>deallocate</code> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;memory&gt;</span>
<span class="kw1">struct</span> Vec3
<span class="br0">{</span>
<span class="kw4">int</span> x, y, z<span class="sy4">;</span>
<span class="co1">// C++20 &#36215;&#19981;&#20877;&#38656;&#35201;&#20197;&#19979;&#26500;&#36896;&#20989;&#25968;</span>
Vec3<span class="br0">(</span><span class="kw4">int</span> x <span class="sy1">=</span> <span class="nu0">0</span>, <span class="kw4">int</span> y <span class="sy1">=</span> <span class="nu0">0</span>, <span class="kw4">int</span> z <span class="sy1">=</span> <span class="nu0">0</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span> x<span class="br0">(</span>x<span class="br0">)</span>, y<span class="br0">(</span>y<span class="br0">)</span>, z<span class="br0">(</span>z<span class="br0">)</span> <span class="br0">{</span> <span class="br0">}</span>
<span class="kw1">friend</span> <a href="cpp-io-basic_ostream.html"><span class="kw1728">std::<span class="me2">ostream</span></span></a><span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span><a href="cpp-io-basic_ostream.html"><span class="kw1728">std::<span class="me2">ostream</span></span></a><span class="sy3">&amp;</span> os, <span class="kw4">const</span> Vec3<span class="sy3">&amp;</span> v<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> os <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;{&#39;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;x:&quot;</span> <span class="sy1">&lt;&lt;</span> v.<span class="me1">x</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; y:&quot;</span> <span class="sy1">&lt;&lt;</span> v.<span class="me1">y</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; z:&quot;</span> <span class="sy1">&lt;&lt;</span> v.<span class="me1">z</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;}&#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#20351;&#29992;&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#12290;</span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>Vec3<span class="sy1">&gt;</span> v1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_unique</span><span class="sy1">&lt;</span>Vec3<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#20351;&#29992;&#21305;&#37197;&#36825;&#20123;&#21442;&#25968;&#30340;&#26500;&#36896;&#20989;&#25968;</span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>Vec3<span class="sy1">&gt;</span> v2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_unique</span><span class="sy1">&lt;</span>Vec3<span class="sy1">&gt;</span><span class="br0">(</span><span class="nu0">0</span>, <span class="nu0">1</span>, <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#21019;&#24314;&#25351;&#21521; 5 &#20010;&#20803;&#32032;&#25968;&#32452;&#30340; unique_ptr </span>
<a href="cpp-memory-unique_ptr.html"><span class="kw733">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span>Vec3<span class="br0">[</span><span class="br0">]</span><span class="sy1">&gt;</span> v3 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_unique</span><span class="sy1">&lt;</span>Vec3<span class="br0">[</span><span class="br0">]</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="nu0">5</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;make_unique&lt;Vec3&gt;(): &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>v1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;make_unique&lt;Vec3&gt;(0,1,2): &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>v2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;make_unique&lt;Vec3[]&gt;(5): &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1">&lt;</span> <span class="nu0">5</span><span class="sy4">;</span> i<span class="sy2">++</span><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; &quot;</span> <span class="sy1">&lt;&lt;</span> v3<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<div class="text source-text">
<pre class="de1">make_unique&lt;Vec3&gt;(): {x:0 y:0 z:0}
make_unique&lt;Vec3&gt;(0,1,2): {x:0 y:1 z:2}
make_unique&lt;Vec3[]&gt;(5):
{x:0 y:0 z:0}
{x:0 y:0 z:0}
{x:0 y:0 z:0}
{x:0 y:0 z:0}
{x:0 y:0 z:0}</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-memory-unique_ptr-unique_ptr.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
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</td>
<td>&#26500;&#36896;&#26032;&#30340;<code>unique_ptr</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td>
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<div><a href="cpp-memory-shared_ptr-make_shared.html"><span class="t-lines"><span>make_shared</span><span>make_shared_for_overwrite</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#21019;&#24314;&#31649;&#29702;&#19968;&#20010;&#26032;&#23545;&#35937;&#30340;&#20849;&#20139;&#25351;&#38024;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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