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<title>std::basic_spanbuf&lt;CharT,Traits&gt;::seekoff</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_spanbuf&lt;CharT,Traits&gt;::</span>seekoff</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_spanbuf.html">basic spanbuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br /></span>
<p>pos_type seekoff<span class="br0">(</span> off_type off, <a href="cpp-io-ios_base-seekdir.html"><span class="kw1702">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">seekdir</span></span></a> dir,<br />
&nbsp; &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> which <span class="sy1">=</span><br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-io-ios_base-openmode.html"><span class="kw1674">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">in</span></span></a> <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> override<span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 &#36215;)</span></td>
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<p>&#33509;&#21487;&#33021;&#21017;&#37325;&#23547;&#20301;&#25351;&#21521;&#33719;&#21462;&#21644;/&#25110;&#25918;&#32622;&#21306;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;&#65292;&#20026;&#23545;&#24212;&#20934;&#30830;&#36317;&#32531;&#20914;&#21306;&#30340;&#33719;&#21462;&#21644;/&#25110;&#25918;&#32622;&#21306;&#30340;&#36215;&#22987;&#12289;&#26411;&#23614;&#25110;&#24403;&#21069;&#20301;&#32622; <code>off</code> &#20010;&#23383;&#31526;&#12290;</p>
<p>&#35774; <code><i>n</i></code> &#20026;&#24213;&#23618;&#32531;&#20914;&#21306;&#20013;&#30340; <code>CharT</code> &#20803;&#32032;&#25968;&#65292;&#25110;&#33509;&#26080;&#24213;&#23618;&#32531;&#20914;&#21306;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65292;&#27492;&#20989;&#25968;&#22312;&#20197;&#19979;&#24773;&#20917;&#22833;&#36133;&#65306;</p>
<ul>
<li>&#24453;&#37325;&#23547;&#20301;&#30340;&#25351;&#21521;&#33719;&#21462;&#21644;/&#25110;&#25918;&#32622;&#21306;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;&#20026;&#31354;&#65292;&#19988;&#35745;&#31639;&#30340; <code><i>newoff</i></code> &#65288;&#35265;&#21518;&#36848;&#65289;&#38750;&#38646;&#65292;&#36825;&#21487;&#33021;&#22312;&#26080;&#24213;&#23618;&#32531;&#20914;&#21306;&#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#19981;&#26159;&#20197; <code>which</code> &#25152;&#35201;&#27714;&#30340;&#27169;&#24335;&#25171;&#24320;&#26102;&#20986;&#29616;&#65292;&#25110;</li>
<li><code>dir</code> &#20026; <span class="t-lc"><a href="cpp-io-ios_base-seekdir.html">std::ios_base::cur</a></span> &#19988; <code>which</code> &#20013;&#19968;&#21516;&#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::in</a></span> &#21644; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::out</a></span> &#65292;&#25110;</li>
<li>&#35745;&#31639;&#30340; <code><i>newoff</i></code> &#26080;&#27861;&#20197; <code>off_type</code> &#34920;&#31034;&#12289;&#23567;&#20110;&#38646;&#25110;&#22823;&#20110; <code><i>n</i></code> &#12290;</li>
</ul>
<p><code><i>newoff</i></code> &#35745;&#31639;&#22914;&#19979;&#65306;</p>
<ul>
<li>&#33509; <code>dir</code> &#20026; <span class="t-lc"><a href="cpp-io-ios_base-seekdir.html">std::ios_base::beg</a></span> &#65292;&#21017; <code><i>newoff</i></code> &#20026; <code>off</code> &#12290;</li>
<li>&#33509; <code>dir</code> &#20026; <span class="t-lc"><a href="cpp-io-ios_base-seekdir.html">std::ios_base::cur</a></span> &#65292;&#21017; <code><i>newoff</i></code> &#20026;
<ul>
<li><span class="t-c"><span class="mw-geshi cpp source-cpp">pptr<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> pbase<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> off</span></span> &#65292;&#33509; <code>which</code> &#20013;&#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::out</a></span> &#65292;&#25110;</li>
<li><span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> eback<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> off</span></span> &#65292;&#33509; <code>which</code> &#20013;&#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::in</a></span> &#12290;</li>
</ul>
</li>
<li>&#33509; <code>dir</code> &#20026; <span class="t-lc"><a href="cpp-io-ios_base-seekdir.html">std::ios_base::end</a></span> &#65292;&#21017; <code><i>newoff</i></code> &#20026;
<ul>
<li><span class="t-c"><span class="mw-geshi cpp source-cpp">pptr<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> pbase<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> off</span></span> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#30340;&#25171;&#24320;&#27169;&#24335;&#20013;&#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::out</a></span> &#20294;&#38750; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::in</a></span> &#65292;</li>
<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">off <span class="sy2">+</span> n</span></span> &#12290;</li>
</ul>
</li>
</ul>
<p>&#27492;&#20989;&#25968;&#22312;&#25104;&#21151;&#26102;&#37325;&#23547;&#20301;&#25351;&#21521;&#33719;&#21462;&#21644;/&#25110;&#25918;&#32622;&#21306;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">pbuf <span class="sy2">+</span> newoff</span></span> &#65292;&#33509;&#22312; <code>which</code> &#20013;&#30456;&#24212;&#22320;&#35774;&#32622;&#20102; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::in</a></span> &#21644;/&#25110; <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::out</a></span> &#65292;&#20854;&#20013; <code><i>pbuf</i></code> &#26159;&#25351;&#21521;&#24213;&#23618;&#32531;&#20914;&#21306;&#30340;&#25351;&#38024;&#65292;&#25110;&#33509;&#26080;&#24213;&#23618;&#32531;&#20914;&#21306;&#21017;&#20026;&#31354;&#25351;&#38024;&#20540;&#12290;</p>
<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>off</td>
<td>-</td>
<td>&#35201;&#35774;&#32622;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;&#21040;&#30340;&#30456;&#23545;&#20301;&#32622;</td>
</tr>
<tr class="t-par">
<td>dir</td>
<td>-</td>
<td>&#23450;&#20041;&#24212;&#29992;&#20559;&#31227;&#21040;&#30340;&#22522;&#20301;&#32622;&#12290;&#23427;&#33021;&#20026;&#19979;&#21015;&#24120;&#37327;&#20043;&#19968;&#65306;
<table class="t-dsc-begin">
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<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
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<tr class="t-dsc">
<td><a href="cpp-io-ios_base-seekdir.html"><tt>beg</tt></a></td>
<td>&#27969;&#30340;&#24320;&#22987;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-seekdir.html"><tt>end</tt></a></td>
<td>&#27969;&#30340;&#32467;&#23614;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-seekdir.html"><tt>cur</tt></a></td>
<td>&#27969;&#20301;&#32622;&#25351;&#31034;&#22120;&#30340;&#24403;&#21069;&#20301;&#32622;</td>
</tr>
</table>
</td>
</tr>
<tr class="t-par">
<td>which</td>
<td>-</td>
<td>&#23450;&#20041;&#24433;&#21709;&#30340;&#26159;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#36824;&#26159;&#20004;&#32773;&#12290;&#23427;&#33021;&#20026;&#19979;&#21015;&#24120;&#37327;&#20043;&#19968;&#25110;&#20854;&#32452;&#21512;&#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>in</tt></a></td>
<td>&#24433;&#21709;&#36755;&#20837;&#24207;&#21015;</td>
</tr>
<tr class="t-dsc">
<td><a href="cpp-io-ios_base-openmode.html"><tt>out</tt></a></td>
<td>&#24433;&#21709;&#36755;&#20986;&#24207;&#21015;</td>
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</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>&#25104;&#21151;&#26102;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">pos_type<span class="br0">(</span>newoff<span class="br0">)</span></span></span> &#65292;&#22833;&#36133;&#26102;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">pos_type<span class="br0">(</span>off_type<span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
<tr>
<td class="mbox-empty-cell"></td>
<td class="mbox-text" style="">&#26412;&#33410;&#26410;&#23436;&#25104;<br />
&#21407;&#22240;&#65306;&#26242;&#26080;&#31034;&#20363;</td>
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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 class="t-dsc-member-div">
<div><a href="cpp-io-basic_stringbuf-seekoff.html"><span class="t-lines"><span>seekoff</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
</div>
</td>
<td>&#29992;&#30456;&#23545;&#23547;&#22336;&#65292;&#37325;&#23450;&#20301;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#25110;&#20004;&#32773;&#20013;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;<br />
<span class="t-mark">(<code>std::basic_stringbuf&lt;CharT,Traits,Allocator&gt;</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-strstreambuf-seekoff.html"><span class="t-lines"><span>seekoff</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
</div>
</td>
<td>&#29992;&#30456;&#23545;&#23547;&#22336;&#37325;&#23547;&#20301;&#36755;&#20837;&#24207;&#21015;&#12289;&#36755;&#20986;&#24207;&#21015;&#25110;&#20004;&#32773;&#20013;&#30340;&#19979;&#19968;&#20301;&#32622;&#25351;&#38024;<br />
<span class="t-mark">(<code>std::strstreambuf</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
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