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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/basic_istringstream.html" title="cpp/io/basic istringstream"><span class="t-lines"><span>basic_istringstream</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/basic_ostringstream.html" title="cpp/io/basic ostringstream"><span class="t-lines"><span>basic_ostringstream</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/basic_stringstream.html" title="cpp/io/basic stringstream"><span class="t-lines"><span>basic_stringstream</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Array I/O </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/istrstream.html" title="cpp/io/istrstream"><span class="t-lines"><span>istrstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/ostrstream.html" title="cpp/io/ostrstream"><span class="t-lines"><span>ostrstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/strstream.html" title="cpp/io/strstream"><span class="t-lines"><span>strstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Types </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/streamoff.html" title="cpp/io/streamoff"><span class="t-lines"><span>streamoff</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/streamsize.html" title="cpp/io/streamsize"><span class="t-lines"><span>streamsize</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/fpos.html" title="cpp/io/fpos"><span class="t-lines"><span>fpos</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Error category interface </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/iostream_category.html" title="cpp/io/iostream category"><span class="t-lines"><span>iostream_category</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io/io_errc.html" title="cpp/io/io errc"><span class="t-lines"><span>io_errc</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>C++ includes two input/output libraries: a modern, stream-based I/O library and the standard set of C-style I/O functions.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="io.html#Stream-based_I.2FO"><span class="tocnumber">1</span> <span class="toctext">Stream-based I/O</span></a>
<ul>
<li class="toclevel-2"><a href="io.html#Abstraction"><span class="tocnumber">1.1</span> <span class="toctext">Abstraction</span></a></li>
<li class="toclevel-2"><a href="io.html#File_I.2FO_implementation"><span class="tocnumber">1.2</span> <span class="toctext">File I/O implementation</span></a></li>
<li class="toclevel-2"><a href="io.html#String_I.2FO_implementation"><span class="tocnumber">1.3</span> <span class="toctext">String I/O implementation</span></a></li>
<li class="toclevel-2"><a href="io.html#Array_I.2FO_implementations"><span class="tocnumber">1.4</span> <span class="toctext">Array I/O implementations</span></a></li>
<li class="toclevel-2 tocsection-2"><a href="io.html#Typedefs"><span class="tocnumber">1.5</span> <span class="toctext">Typedefs</span></a></li>
<li class="toclevel-2 tocsection-3"><a href="io.html#I.2FO_Manipulators"><span class="tocnumber">1.6</span> <span class="toctext">I/O Manipulators</span></a></li>
<li class="toclevel-2 tocsection-4"><a href="io.html#Types"><span class="tocnumber">1.7</span> <span class="toctext">Types</span></a></li>
<li class="toclevel-2 tocsection-5"><a href="io.html#Error_category_interface"><span class="tocnumber">1.8</span> <span class="toctext">Error category interface</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-6"><a href="io.html#C-style_IO"><span class="tocnumber">2</span> <span class="toctext">C-style IO</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io&action=edit&section=1" title="Edit section: Stream-based I/O">edit</a>]</span> <span class="mw-headline" id="Stream-based_I.2FO">Stream-based I/O</span></h3>
<p>The stream-based input/output library is organized around abstract input/output devices. These abstract devices allow the same code to handle input/output to files, memory streams, or custom adaptor devices that perform arbitrary operations (e.g. compression) on the fly.
</p><p>Most of the classes are templated, so they can be adapted to any basic character type. Separate typedefs are provided for the most common basic character types (<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> and <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span></span></span>). The classes are organized into the following hierarchy:
</p>
<div class="t-inheritance-diagram">
<div class="center"><div class="noresize" style="height: 377px; width: 549px; "><map name="ImageMap_1_757929268"><area href="io/ios_base.html" shape="rect" coords="225,4,328,36" alt="cpp/io/ios base" title="cpp/io/ios base"/><area href="io/basic_ios.html" shape="rect" coords="218,62,335,100" alt="cpp/io/basic ios" title="cpp/io/basic ios"/><area href="io/basic_istream.html" shape="rect" coords="305,126,422,164" alt="cpp/io/basic istream" title="cpp/io/basic istream"/><area href="io/basic_ifstream.html" shape="rect" coords="419,319,536,357" alt="cpp/io/basic ifstream" title="cpp/io/basic ifstream"/><area href="io/basic_istringstream.html" shape="rect" coords="410,255,545,292" alt="cpp/io/basic istringstream" title="cpp/io/basic istringstream"/><area href="io/basic_ostream.html" shape="rect" coords="130,126,247,164" alt="cpp/io/basic ostream" title="cpp/io/basic ostream"/><area href="io/basic_ofstream.html" shape="rect" coords="14,319,132,357" alt="cpp/io/basic ofstream" title="cpp/io/basic ofstream"/><area href="io/basic_ostringstream.html" shape="rect" coords="4,255,143,292" alt="cpp/io/basic ostringstream" title="cpp/io/basic ostringstream"/><area href="io/basic_fstream.html" shape="rect" coords="200,319,318,357" alt="cpp/io/basic fstream" title="cpp/io/basic fstream"/><area href="io/basic_stringstream.html" shape="rect" coords="193,255,325,292" alt="cpp/io/basic stringstream" title="cpp/io/basic stringstream"/><area href="io/basic_iostream.html" shape="rect" coords="221,190,339,228" alt="cpp/io/basic iostream" title="cpp/io/basic iostream"/></map><img alt="std-io-complete-inheritance.svg" src="../../../upload.cppreference.com/mwiki/images/0/06/std-io-complete-inheritance.svg" width="549" height="377" usemap="#ImageMap_1_757929268"/><div style="margin-left: 529px; margin-top: -20px; text-align: left;"><a href="http://en.cppreference.com/w/File:std-io-complete-inheritance.svg" title="About this image"><img alt="About this image" src="../../mwiki/extensions/ImageMap/desc-20.png" style="border: none;"/></a></div></div></div>
<div style="text-align:center;">
<p><span style="font-size:0.7em; line-height:130%">Inheritance diagram</span>
</p>
</div>
</div>
<table class="t-dsc-begin">
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Abstraction"> Abstraction </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/ios_base.html" title="cpp/io/ios base"> <span class="t-lines"><span>ios_base</span></span></a></div></div>
</td>
<td> manages formatting flags and input/output exceptions <br /> <span class="t-mark">(class)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_ios.html" title="cpp/io/basic ios"> <span class="t-lines"><span>basic_ios</span></span></a></div></div>
</td>
<td> manages an arbitrary stream buffer <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_streambuf.html" title="cpp/io/basic streambuf"> <span class="t-lines"><span>basic_streambuf</span></span></a></div></div>
</td>
<td> abstracts a raw device <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_istream.html" title="cpp/io/basic istream"> <span class="t-lines"><span>basic_istream</span></span></a></div></div>
</td>
<td> wraps a given abstract device (<span class="t-lc"><a href="io/basic_streambuf.html" title="cpp/io/basic streambuf">std::basic_streambuf</a></span>)<br /> and provides high-level input interface <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_ostream.html" title="cpp/io/basic ostream"> <span class="t-lines"><span>basic_ostream</span></span></a></div></div>
</td>
<td> wraps a given abstract device (<span class="t-lc"><a href="io/basic_streambuf.html" title="cpp/io/basic streambuf">std::basic_streambuf</a></span>)<br /> and provides high-level output interface <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_iostream.html" title="cpp/io/basic iostream"> <span class="t-lines"><span>basic_iostream</span></span></a></div></div>
</td>
<td> wraps a given abstract device (<span class="t-lc"><a href="io/basic_streambuf.html" title="cpp/io/basic streambuf">std::basic_streambuf</a></span>)<br /> and provides high-level input/output interface <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="File_I.2FO_implementation"> File I/O implementation </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_filebuf.html" title="cpp/io/basic filebuf"> <span class="t-lines"><span>basic_filebuf</span></span></a></div></div>
</td>
<td> implements raw file device <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_ifstream.html" title="cpp/io/basic ifstream"> <span class="t-lines"><span>basic_ifstream</span></span></a></div></div>
</td>
<td> implements high-level file stream input operations <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_ofstream.html" title="cpp/io/basic ofstream"> <span class="t-lines"><span>basic_ofstream</span></span></a></div></div>
</td>
<td> implements high-level file stream output operations <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_fstream.html" title="cpp/io/basic fstream"> <span class="t-lines"><span>basic_fstream</span></span></a></div></div>
</td>
<td> implements high-level file stream input/output operations <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="String_I.2FO_implementation"> String I/O implementation </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_stringbuf.html" title="cpp/io/basic stringbuf"> <span class="t-lines"><span>basic_stringbuf</span></span></a></div></div>
</td>
<td> implements raw string device <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_istringstream.html" title="cpp/io/basic istringstream"> <span class="t-lines"><span>basic_istringstream</span></span></a></div></div>
</td>
<td> implements high-level string stream input operations <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_ostringstream.html" title="cpp/io/basic ostringstream"> <span class="t-lines"><span>basic_ostringstream</span></span></a></div></div>
</td>
<td> implements high-level string stream output operations <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/basic_stringstream.html" title="cpp/io/basic stringstream"> <span class="t-lines"><span>basic_stringstream</span></span></a></div></div>
</td>
<td> implements high-level string stream input/output operations <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Array_I.2FO_implementations"> Array I/O implementations </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/strstreambuf.html" title="cpp/io/strstreambuf"> <span class="t-lines"><span>strstreambuf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div>
</td>
<td> implements raw character array device <br /> <span class="t-mark">(class)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/istrstream.html" title="cpp/io/istrstream"> <span class="t-lines"><span>istrstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div>
</td>
<td> implements character array input operations <br /> <span class="t-mark">(class)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/ostrstream.html" title="cpp/io/ostrstream"> <span class="t-lines"><span>ostrstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div>
</td>
<td> implements character array output operations <br /> <span class="t-mark">(class)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/strstream.html" title="cpp/io/strstream"> <span class="t-lines"><span>strstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div>
</td>
<td> implements character array input/output operations <br /> <span class="t-mark">(class)</span>
</td></tr>
</table>
<h4><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io&action=edit&section=2" title="Edit section: Typedefs">edit</a>]</span> <span class="mw-headline" id="Typedefs">Typedefs</span></h4>
<p>The following typedefs for common character types are provided:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw1">typedef</span> basic_ios<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> ios<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ios<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wios<span class="sy4">;</span>
 
<span class="kw1">typedef</span> basic_streambuf<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> streambuf<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_streambuf<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wstreambuf<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_filebuf<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> filebuf<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_filebuf<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wfilebuf<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_stringbuf<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> stringbuf<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_stringbuf<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wstringbuf<span class="sy4">;</span>
 
<span class="kw1">typedef</span> basic_istream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> istream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_istream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wistream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> ostream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ostream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wostream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_iostream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> iostream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_iostream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wiostream<span class="sy4">;</span>
 
<span class="kw1">typedef</span> basic_ifstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> ifstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ifstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wifstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ofstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> ofstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ofstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wofstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_fstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> fstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_fstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wfstream<span class="sy4">;</span>
 
<span class="kw1">typedef</span> basic_istringstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> istringstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_istringstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wistringstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ostringstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> ostringstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_ostringstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wostringstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_stringstream<span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> stringstream<span class="sy4">;</span>
<span class="kw1">typedef</span> basic_stringstream<span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span> wstringstream<span class="sy4">;</span></pre></div></div>
<p>Predefined standard stream objects:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw4">extern</span> istream cin<span class="sy4">;</span> <span class="co1">//standard input (stdin)</span>
<span class="kw4">extern</span> wistream wcin<span class="sy4">;</span>
<span class="kw4">extern</span> ostream cout<span class="sy4">;</span> <span class="co1">//standard output (stdout)</span>
<span class="kw4">extern</span> wostream wcout<span class="sy4">;</span>
<span class="kw4">extern</span> ostream cerr<span class="sy4">;</span> <span class="co1">//standard error (stderr)</span>
<span class="kw4">extern</span> wostream wcerr<span class="sy4">;</span>
<span class="kw4">extern</span> ostream clog<span class="sy4">;</span> <span class="co1">//standard log (stdlog)</span>
<span class="kw4">extern</span> wostream wclog<span class="sy4">;</span></pre></div></div>
<h4><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io&action=edit&section=3" title="Edit section: I/O Manipulators">edit</a>]</span> <span class="mw-headline" id="I.2FO_Manipulators"><a href="io/manip.html" title="cpp/io/manip">I/O Manipulators</a></span></h4>
<p>The stream-based I/O library uses <a href="io/manip.html" title="cpp/io/manip"> I/O manipulators</a> (e.g. <span class="t-lc"><a href="io/manip/boolalpha.html" title="cpp/io/manip/boolalpha">std::boolalpha</a></span>, <span class="t-lc"><a href="io/manip/hex.html" title="cpp/io/manip/hex">std::hex</a></span>, etc.) to control how streams behave.
</p>
<h4><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io&action=edit&section=4" title="Edit section: Types">edit</a>]</span> <span class="mw-headline" id="Types">Types</span></h4>
<p>The following auxiliary types are defined:
</p>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><ios></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/streamoff.html" title="cpp/io/streamoff"> <span class="t-lines"><span>streamoff</span></span></a></div></div>
</td>
<td> represents relative file/stream position (offset from fpos), sufficient to represent any file size <br /> <span class="t-mark">(typedef)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/streamsize.html" title="cpp/io/streamsize"> <span class="t-lines"><span>streamsize</span></span></a></div></div>
</td>
<td> represents the number of characters transferred in an I/O operation or the size of an I/O buffer <br /> <span class="t-mark">(typedef)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/fpos.html" title="cpp/io/fpos"> <span class="t-lines"><span>fpos</span></span></a></div></div>
</td>
<td> represents absolute position in a stream or a file <br /> <span class="t-mark">(class template)</span>
</td></tr>
</table>
<p>Four specializations of <span class="t-lc"><a href="io/fpos.html" title="cpp/io/fpos">std::fpos</a></span> are provided:
</p>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><ios></code> </div>
</td></tr>
<tr class="t-dsc-hitem">
<td> Type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <code>streampos</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="io/fpos.html"><span class="kw1485">std::<span class="me2">fpos</span></span></a><span class="sy1"><</span><a href="string/char_traits.html"><span class="kw1064">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span><span class="sy4">::</span><span class="me2">state_type</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>u16streampos</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="io/fpos.html"><span class="kw1485">std::<span class="me2">fpos</span></span></a><span class="sy1"><</span><a href="string/char_traits.html"><span class="kw1064">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span><span class="kw4">char16_t</span><span class="sy1">></span><span class="sy4">::</span><span class="me2">state_type</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>u32streampos</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="io/fpos.html"><span class="kw1485">std::<span class="me2">fpos</span></span></a><span class="sy1"><</span><a href="string/char_traits.html"><span class="kw1064">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span><span class="kw4">char32_t</span><span class="sy1">></span><span class="sy4">::</span><span class="me2">state_type</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>wstreampos</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="io/fpos.html"><span class="kw1485">std::<span class="me2">fpos</span></span></a><span class="sy1"><</span><a href="string/char_traits.html"><span class="kw1064">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span><span class="sy4">::</span><span class="me2">state_type</span><span class="sy1">></span></span></span>
</td></tr>
</table>
<h4><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io&action=edit&section=5" title="Edit section: Error category interface">edit</a>]</span> <span class="mw-headline" id="Error_category_interface">Error category interface</span></h4>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><ios></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/io_errc.html" title="cpp/io/io errc"> <span class="t-lines"><span>io_errc</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> the IO stream error codes <br /> <span class="t-mark">(enum)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_io_errc&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="io/iostream_category.html" title="cpp/io/iostream category"> <span class="t-lines"><span>iostream_category</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> identifies the iostream error category <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_iostream_category&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io&action=edit&section=6" title="Edit section: C-style IO">edit</a>]</span> <span class="mw-headline" id="C-style_IO"><a href="io/c.html" title="cpp/io/c"> C-style IO</a></span></h3>
<p>C++ also includes the <a href="io/c.html" title="cpp/io/c"> input/output functions defined by C</a>, such as <span class="t-lc"><a href="io/c/fopen.html" title="cpp/io/c/fopen">std::fopen</a></span>, <span class="t-lc"><a href="io/c/fgetc.html" title="cpp/io/c/fgetc">std::getc</a></span>, etc.
</p>
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