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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_ofstream&lt;CharT,Traits&gt;::</span>basic_ofstream</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-io.html">io</a>&lrm; | <a href="cpp-io-basic_ofstream.html">basic ofstream</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_ofstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_ofstream<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> filename,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-io-ios_base-openmode.html"><span class="kw1671">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">openmode</span></span></a> mode <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">out</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_ofstream<span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">path</span><span class="sy4">::</span><span class="me2">value_type</span><span class="sy2">*</span> filename,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-io-ios_base-openmode.html"><span class="kw1671">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">openmode</span></span></a> mode <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">out</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_ofstream<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy3">&amp;</span> filename,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-io-ios_base-openmode.html"><span class="kw1671">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">openmode</span></span></a> mode <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">out</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-cxx11">(C++11 &#36215;)</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 /></span>
<p><span class="kw1">explicit</span> basic_ofstream<span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> filename,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-io-ios_base-openmode.html"><span class="kw1671">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">openmode</span></span></a> mode <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">out</span> <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(5)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_ofstream<span class="br0">(</span> basic_ofstream<span class="sy3">&amp;&amp;</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(6)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_ofstream<span class="br0">(</span> <span class="kw4">const</span> basic_ofstream<span class="sy3">&amp;</span> rhs<span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(7)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p>&#26500;&#36896;&#26032;&#30340;&#25991;&#20214;&#27969;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#65306;&#26500;&#36896;&#19981;&#20851;&#32852;&#21040;&#25991;&#20214;&#30340;&#27969;&#65306;&#40664;&#35748;&#26500;&#36896; <span class="t-lc"><a href="cpp-io-basic_filebuf.html">std::basic_filebuf</a></span> &#24182;&#26500;&#36896;&#25317;&#26377;&#25351;&#21521;&#27492;&#40664;&#35748;&#26500;&#36896;&#30340; <span class="t-lc"><a href="cpp-io-basic_filebuf.html">std::basic_filebuf</a></span> &#25104;&#21592;&#30340;&#22522;&#31867;&#12290;</div>
<div class="t-li1"><span class="t-li">2-3)</span> &#39318;&#20808;&#65292;&#36827;&#34892;&#21516;&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#30340;&#27493;&#39588;&#65292;&#28982;&#21518;&#36890;&#36807;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">rdbuf<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>open<span class="br0">(</span>filename, mode <span class="sy3">|</span> <a href="cpp-io-ios_base-openmode.html"><span class="kw1675">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">out</span></span></a><span class="br0">)</span></span></span>&#65288;&#35813;&#35843;&#29992;&#25928;&#26524;&#19978;&#30340;&#32454;&#33410;&#35265; <span class="t-lc"><a href="cpp-io-basic_filebuf-open.html">std::basic_filebuf::open</a></span> &#65289;&#20851;&#32852;&#27969;&#19982;&#25991;&#20214;&#12290;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">open<span class="br0">(</span><span class="br0">)</span></span></span> &#35843;&#29992;&#36820;&#22238;&#31354;&#25351;&#38024;&#65292;&#21017;&#35774;&#32622; <span class="t-c"><span class="mw-geshi cpp source-cpp">setstate<span class="br0">(</span>failbit<span class="br0">)</span></span></span> &#12290;<span class="t-rev-inl t-since-cxx17"><span>&#20165;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">filesystem</span><span class="sy4">::</span><span class="me2">path</span><span class="sy4">::</span><span class="me2">value_type</span></span></span> &#38750; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> &#25165;&#25552;&#20379;&#37325;&#36733; <span class="t-v">(3)</span> &#12290;</span> <span><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></span></span></div>
<div class="t-li1"><span class="t-li">4-5)</span> &#21516; <span class="t-c"><span class="mw-geshi cpp source-cpp">basic_ofstream<span class="br0">(</span>filename.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span>, mode<span class="br0">)</span></span></span> &#12290; <span class="t-rev-inl t-since-cxx17"><span><span class="t-v">(5)</span> &#20165;&#33509; <code>T</code> &#20026; <span class="t-lc"><a href="cpp-filesystem-path.html">std::filesystem::path</a></span> &#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</span> <span><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></span></span>&#27880;&#24847;&#65292;&#23613;&#31649;&#40664;&#35748;&#27169;&#24335;&#26159; <code>out</code> &#65292;&#25928;&#26524;&#31561;&#21516;&#20110;&#25551;&#36848;&#20110; <a href="cpp-io-basic_filebuf-open.html"><tt>std::filebuf::open</tt></a> &#30340; <code>out|trunc</code> &#30340;&#25928;&#26524;&#12290;</div>
<div class="t-li1"><span class="t-li">6)</span> &#31227;&#21160;&#26500;&#36896;&#20989;&#25968;&#65306;&#39318;&#20808;&#65292;&#20174; <code>other</code> &#31227;&#21160;&#26500;&#36896;&#22522;&#31867;&#65288;&#36825;&#19981;&#24433;&#21709; <code>rdbuf()</code> &#25351;&#38024;&#65289;&#65292;&#28982;&#21518;&#31227;&#21160;&#26500;&#36896; <span class="t-lc"><a href="cpp-io-basic_filebuf.html">std::basic_filebuf</a></span> &#25104;&#21592;&#65292;&#20877;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">this<span class="sy2">-</span><span class="sy1">&gt;</span>set_rdbuf<span class="br0">(</span><span class="br0">)</span></span></span> &#23433;&#35013;&#26032;&#30340; <code>basic_filebuf</code> &#20026;&#22522;&#31867;&#20013;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp">rdbuf<span class="br0">(</span><span class="br0">)</span></span></span> &#25351;&#38024;&#12290;</div>
<div class="t-li1"><span class="t-li">7)</span> &#22797;&#21046;&#26500;&#36896;&#20989;&#25968;&#34987;&#21024;&#38500;&#65306;&#27492;&#31867;&#19981;&#21487;&#22797;&#21046;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>filename</td>
<td>-</td>
<td>&#35201;&#25171;&#24320;&#30340;&#25991;&#20214;&#21517;</td>
</tr>
<tr class="t-par">
<td>mode</td>
<td>-</td>
<td>&#25351;&#23450;&#25171;&#24320;&#27169;&#24335;&#12290;&#21487;&#20351;&#29992;&#19979;&#21015;&#24120;&#37327;&#25110;&#23427;&#20204;&#20043;&#38388;&#30340;&#36880;&#20301;&#25110;&#65306;
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>app</tt></a></td>
<td>&#27599;&#27425;&#20889;&#20837;&#21069;&#23547;&#20301;&#21040;&#27969;&#32467;&#23614;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>binary</tt></a></td>
<td>&#20197;<a href="cpp-io-c-FILE.html#.E4.BA.8C.E8.BF.9B.E5.88.B6.E4.B8.8E.E6.96.87.E6.9C.AC.E6.A8.A1.E5.BC.8F">&#20108;&#36827;&#21046;&#27169;&#24335;</a>&#25171;&#24320;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>in</tt></a></td>
<td>&#20026;&#35835;&#25171;&#24320;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>out</tt></a></td>
<td>&#20026;&#20889;&#25171;&#24320;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>trunc</tt></a></td>
<td>&#22312;&#25171;&#24320;&#26102;&#33293;&#24323;&#27969;&#30340;&#20869;&#23481;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>ate</tt></a></td>
<td>&#25171;&#24320;&#21518;&#31435;&#21363;&#23547;&#20301;&#21040;&#27969;&#32467;&#23614;</td>
</tr>
</table>
</td>
</tr>
<tr class="t-par">
<td>other</td>
<td>-</td>
<td>&#29992;&#20316;&#28304;&#30340;&#21478;&#19968;&#25991;&#20214;&#27969;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example t-example-std-cxx11">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;fstream&gt;</span>
<span class="co2">#include &lt;utility&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a> f0<span class="sy4">;</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a> f1<span class="br0">(</span><span class="st0">&quot;test.bin&quot;</span>, std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">binary</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> name <span class="sy1">=</span> <span class="st0">&quot;example.txt&quot;</span><span class="sy4">;</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a> f2<span class="br0">(</span>name<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a> f3<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>f1<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3430">LWG 3430</a></td>
<td>C++17</td>
<td><span class="t-lc"><a href="cpp-filesystem-path.html">std::filesystem::path</a></span> &#37325;&#36733;&#23548;&#33268;&#20102;&#19981;&#24819;&#35201;&#30340;&#36716;&#25442;</td>
<td>&#20351;&#20043;&#20026;&#27169;&#26495;&#20197;&#36991;&#20813;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_ofstream-open.html"><span class="t-lines"><span>open</span></span></a></div>
</div>
</td>
<td>&#25171;&#24320;&#25991;&#20214;&#65292;&#24182;&#23558;&#23427;&#19982;&#27969;&#20851;&#32852;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_filebuf-open.html"><span class="t-lines"><span>open</span></span></a></div>
</div>
</td>
<td>&#25171;&#24320;&#25991;&#20214;&#24182;&#37197;&#32622;&#23427;&#20026;&#20851;&#32852;&#23383;&#31526;&#24207;&#21015;<br />
<span class="t-mark">(<code>std::basic_filebuf&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-basic_ios-set_rdbuf.html"><span class="t-lines"><span>set_rdbuf</span></span></a></div>
</div>
</td>
<td>&#26367;&#25442; <code>rdbuf</code> &#32780;&#19981;&#28165;&#38500;&#20854;&#38169;&#35823;&#29366;&#24577;<br />
<span class="t-mark">(&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-io-basic_ostream-basic_ostream.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
</div>
</td>
<td>&#26500;&#36896;&#23545;&#35937;<br />
<span class="t-mark">(<code>std::basic_ostream&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>