<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.15"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>libstdc++: iostream Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtreedata.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ $(document).ready(initResizable); /* @license-end */</script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td id="projectalign" style="padding-left: 0.5em;"> <div id="projectname">libstdc++ </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.15 --> </div><!-- top --> <div id="side-nav" class="ui-resizable side-nav-resizable"> <div id="nav-tree"> <div id="nav-tree-contents"> <div id="nav-sync" class="sync"></div> </div> </div> <div id="splitbar" style="-moz-user-select:none;" class="ui-resizable-handle"> </div> </div> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ $(document).ready(function(){initNavTree('a00086_source.html','');}); /* @license-end */ </script> <div id="doc-content"> <div class="header"> <div class="headertitle"> <div class="title">iostream</div> </div> </div><!--header--> <div class="contents"> <a href="a00086.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Standard iostream objects -*- C++ -*-</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 1997-2018 Free Software Foundation, Inc.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file include/iostream</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * This is a Standard C++ Library header.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">//</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// ISO C++ 14882: 27.3 Standard iostream objects</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">//</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#ifndef _GLIBCXX_IOSTREAM</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#define _GLIBCXX_IOSTREAM 1</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#pragma GCC system_header</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#include <<a class="code" href="a00656.html">bits/c++config.h</a>></span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include <<a class="code" href="a00116.html">ostream</a>></span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include <<a class="code" href="a00089.html">istream</a>></span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">namespace </span><a class="code" href="a01538.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"></span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> /**</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * @name Standard Stream Objects</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> *</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * The &lt;iostream&gt; header declares the eight <em>standard stream</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * objects</em>. For other declarations, see</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * http://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * and the @link iosfwd I/O forward declarations @endlink</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> *</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * They are required by default to cooperate with the global C</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * library's @c FILE streams, and to be available during program</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * startup and termination. For more information, see the section of the</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * manual linked to above.</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> */</span><span class="comment"></span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> //@{</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga9a51d9b711a836df9c086f3a5e30b8b2">istream</a> <a class="code" href="a01538.html#afdcd7ecbf1544ef3f79b89f0dd06c3b7">cin</a>; <span class="comment">/// Linked to standard input</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga55d4c0674fbacb7514ae76310aeb4bf8">ostream</a> <a class="code" href="a01538.html#aaf93fdf0812752e0e02c501dea1b38f0">cout</a>; <span class="comment">/// Linked to standard output</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga55d4c0674fbacb7514ae76310aeb4bf8">ostream</a> <a class="code" href="a01538.html#a7431d56d1e8cd7a9b854171294bd71c7">cerr</a>; <span class="comment">/// Linked to standard error (unbuffered)</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga55d4c0674fbacb7514ae76310aeb4bf8">ostream</a> <a class="code" href="a01538.html#a7e2a2fc4b5924b7292c0566ca4c95463">clog</a>; <span class="comment">/// Linked to standard error (buffered)</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"></span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#ifdef _GLIBCXX_USE_WCHAR_T</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">extern</span> <a class="code" href="a01470.html#ga9bfb52397cc747f9945d73a1f38e86e8">wistream</a> <a class="code" href="a01538.html#ab1807d3145162e06150b063da4da2707">wcin</a>; <span class="comment">/// Linked to standard input</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga9ad6702c06821cdd550e08ef2b70f3b7">wostream</a> <a class="code" href="a01538.html#a2f5fc307ed84f0ecfbc36d2cda322040">wcout</a>; <span class="comment">/// Linked to standard output</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga9ad6702c06821cdd550e08ef2b70f3b7">wostream</a> <a class="code" href="a01538.html#ae50854b2a6629e6504846f8aff472e7e">wcerr</a>; <span class="comment">/// Linked to standard error (unbuffered)</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"></span> <span class="keyword">extern</span> <a class="code" href="a01470.html#ga9ad6702c06821cdd550e08ef2b70f3b7">wostream</a> <a class="code" href="a01538.html#a09e3edb1609f2a7fb18370eab59ba8dc">wclog</a>; <span class="comment">/// Linked to standard error (buffered)</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"></span><span class="preprocessor">#endif</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> //@}</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// For construction of filebuffers for cout, cin, cerr, clog et. al.</span></div><div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="a01538.html#a7f2a8c6d20dc1d386dd1cfd42f7e3530"> 74</a></span>  <span class="keyword">static</span> ios_base::Init <a class="code" href="a01538.html#a7f2a8c6d20dc1d386dd1cfd42f7e3530">__ioinit</a>;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#endif </span><span class="comment">/* _GLIBCXX_IOSTREAM */</span><span class="preprocessor"></span></div><div class="ttc" id="a01538_html_aaf93fdf0812752e0e02c501dea1b38f0"><div class="ttname"><a href="a01538.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a></div><div class="ttdeci">ostream cout</div><div class="ttdoc">Linked to standard input.</div></div> <div class="ttc" id="a00656_html"><div class="ttname"><a href="a00656.html">c++config.h</a></div></div> <div class="ttc" id="a01538_html_a2f5fc307ed84f0ecfbc36d2cda322040"><div class="ttname"><a href="a01538.html#a2f5fc307ed84f0ecfbc36d2cda322040">std::wcout</a></div><div class="ttdeci">wostream wcout</div><div class="ttdoc">Linked to standard input.</div></div> <div class="ttc" id="a01470_html_ga9ad6702c06821cdd550e08ef2b70f3b7"><div class="ttname"><a href="a01470.html#ga9ad6702c06821cdd550e08ef2b70f3b7">std::wostream</a></div><div class="ttdeci">basic_ostream< wchar_t > wostream</div><div class="ttdoc">Base class for wchar_t output streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00083_source.html#l00181">iosfwd:181</a></div></div> <div class="ttc" id="a01538_html_ab1807d3145162e06150b063da4da2707"><div class="ttname"><a href="a01538.html#ab1807d3145162e06150b063da4da2707">std::wcin</a></div><div class="ttdeci">wistream wcin</div><div class="ttdoc">Linked to standard error (buffered)</div></div> <div class="ttc" id="a01538_html_afdcd7ecbf1544ef3f79b89f0dd06c3b7"><div class="ttname"><a href="a01538.html#afdcd7ecbf1544ef3f79b89f0dd06c3b7">std::cin</a></div><div class="ttdeci">istream cin</div><div class="ttdoc">Linked to standard input.</div></div> <div class="ttc" id="a01538_html_a7f2a8c6d20dc1d386dd1cfd42f7e3530"><div class="ttname"><a href="a01538.html#a7f2a8c6d20dc1d386dd1cfd42f7e3530">std::__ioinit</a></div><div class="ttdeci">static ios_base::Init __ioinit</div><div class="ttdoc">Linked to standard error (buffered)</div><div class="ttdef"><b>Definition:</b> <a href="a00086_source.html#l00074">iostream:74</a></div></div> <div class="ttc" id="a01470_html_ga55d4c0674fbacb7514ae76310aeb4bf8"><div class="ttname"><a href="a01470.html#ga55d4c0674fbacb7514ae76310aeb4bf8">std::ostream</a></div><div class="ttdeci">basic_ostream< char > ostream</div><div class="ttdoc">Base class for char output streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00083_source.html#l00141">iosfwd:141</a></div></div> <div class="ttc" id="a01538_html"><div class="ttname"><a href="a01538.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div> <div class="ttc" id="a01538_html_a7431d56d1e8cd7a9b854171294bd71c7"><div class="ttname"><a href="a01538.html#a7431d56d1e8cd7a9b854171294bd71c7">std::cerr</a></div><div class="ttdeci">ostream cerr</div><div class="ttdoc">Linked to standard output.</div></div> <div class="ttc" id="a01538_html_a09e3edb1609f2a7fb18370eab59ba8dc"><div class="ttname"><a href="a01538.html#a09e3edb1609f2a7fb18370eab59ba8dc">std::wclog</a></div><div class="ttdeci">wostream wclog</div><div class="ttdoc">Linked to standard error (unbuffered)</div></div> <div class="ttc" id="a00089_html"><div class="ttname"><a href="a00089.html">istream</a></div></div> <div class="ttc" id="a01470_html_ga9bfb52397cc747f9945d73a1f38e86e8"><div class="ttname"><a href="a01470.html#ga9bfb52397cc747f9945d73a1f38e86e8">std::wistream</a></div><div class="ttdeci">basic_istream< wchar_t > wistream</div><div class="ttdoc">Base class for wchar_t input streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00083_source.html#l00178">iosfwd:178</a></div></div> <div class="ttc" id="a01538_html_ae50854b2a6629e6504846f8aff472e7e"><div class="ttname"><a href="a01538.html#ae50854b2a6629e6504846f8aff472e7e">std::wcerr</a></div><div class="ttdeci">wostream wcerr</div><div class="ttdoc">Linked to standard output.</div></div> <div class="ttc" id="a00116_html"><div class="ttname"><a href="a00116.html">ostream</a></div></div> <div class="ttc" id="a01470_html_ga9a51d9b711a836df9c086f3a5e30b8b2"><div class="ttname"><a href="a01470.html#ga9a51d9b711a836df9c086f3a5e30b8b2">std::istream</a></div><div class="ttdeci">basic_istream< char > istream</div><div class="ttdoc">Base class for char input streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00083_source.html#l00138">iosfwd:138</a></div></div> <div class="ttc" id="a01538_html_a7e2a2fc4b5924b7292c0566ca4c95463"><div class="ttname"><a href="a01538.html#a7e2a2fc4b5924b7292c0566ca4c95463">std::clog</a></div><div class="ttdeci">ostream clog</div><div class="ttdoc">Linked to standard error (unbuffered)</div></div> </div><!-- fragment --></div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="navelem"><a class="el" href="dir_3a83f109ff04170a1f8448445d1bdcba.html">include</a></li><li 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