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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../basic_iostream.html" title="cpp/io/basic iostream"><span class="t-lines"><span>basic_iostream</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> File I/O </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../basic_ifstream.html" title="cpp/io/basic ifstream"><span class="t-lines"><span>basic_ifstream</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../basic_ofstream.html" title="cpp/io/basic ofstream"><span class="t-lines"><span>basic_ofstream</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../basic_fstream.html" title="cpp/io/basic fstream"><span class="t-lines"><span>basic_fstream</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> String I/O </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../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="../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="../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="../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="../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="../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="../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="../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="../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="../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_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 class="t-navbar-head"><a href="../basic_ostream.html" title="cpp/io/basic ostream"><tt>std::basic_ostream</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Global objects</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../cout.html" title="cpp/io/cout"><span class="t-lines"><span>cout</span><span>wcout</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../cerr.html" title="cpp/io/cerr"><span class="t-lines"><span>cerr</span><span>wcerr</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../clog.html" title="cpp/io/clog"><span class="t-lines"><span>clog</span><span>wclog</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ostream.html" title="cpp/io/basic ostream/basic ostream"><span class="t-lines"><span>basic_ostream::basic_ostream</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~basic_ostream.html" title="cpp/io/basic ostream/~basic ostream"><span class="t-lines"><span>basic_ostream::~basic_ostream</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator=.html" title="cpp/io/basic ostream/operator="><span class="t-lines"><span>basic_ostream::operator=</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-h2"><td colspan="5"> Formatted output </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator_ltlt.html" title="cpp/io/basic ostream/operator ltlt"><span class="t-lines"><span>basic_ostream::operator<<</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Unformatted output </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="put.html" title="cpp/io/basic ostream/put"><span class="t-lines"><span>basic_ostream::put</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="write.html" title="cpp/io/basic ostream/write"><span class="t-lines"><span>basic_ostream::write</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Positioning </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tellp.html" title="cpp/io/basic ostream/tellp"><span class="t-lines"><span>basic_ostream::tellp</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="seekp.html" title="cpp/io/basic ostream/seekp"><span class="t-lines"><span>basic_ostream::seekp</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Miscellaneous </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="flush.html" title="cpp/io/basic ostream/flush"><span class="t-lines"><span>basic_ostream::flush</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap.html" title="cpp/io/basic ostream/swap"><span class="t-lines"><span>basic_ostream::swap</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-h1"><td colspan="5"> Member classes</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="sentry.html" title="cpp/io/basic ostream/sentry"><span class="t-lines"><span>basic_ostream::sentry</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Non-member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>operator<<<span class="t-dsc-small">(std::basic_ostream)</span></span></span></strong></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/basic_ostream/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits<span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> os,<br />
</p>
                                         CharT ch <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits<span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> os,<br />
</p>
                                         <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> os,<br />
</p>
                                        <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> os,<br />
</p>
                                        <span class="kw4">signed</span> <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> os,<br />
</p>
                                        <span class="kw4">unsigned</span> <span class="kw4">char</span> ch <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> os, <br />
</p>
                                         <span class="kw4">const</span> CharT<span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&</span> os, <br />
</p>
                                         <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> os,  <br />
</p>
                                        <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> os, <br />
</p>
                                        <span class="kw4">const</span> <span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Traits <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span><span class="kw4">char</span>,Traits<span class="sy1">></span><span class="sy3">&</span> os, <br />
</p>
                                        <span class="kw4">const</span> <span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> s <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
</tbody><tbody>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits, <span class="kw1">class</span> T <span class="sy1">></span><br />
<p>basic_ostream<span class="sy1"><</span> CharT, Traits <span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy3">&&</span> os, <br />
</p>
                                            <span class="kw4">const</span> T<span class="sy3">&</span> value <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Inserts a character or a character string.
</p>
<div class="t-li1"><span class="t-li">1)</span> Behaves as an <a href="../../concept/FormattedOutputFunction.html" title="cpp/concept/FormattedOutputFunction"><code>FormattedOutputFunction</code></a>. After constructing and checking the sentry object, inserts the character <code>ch</code>. If the type of the character is not <code>CharT</code>, it is first converted with <span class="t-c"><span class="mw-geshi cpp source-cpp">os.<span class="me1">widen</span><span class="br0">(</span>ch<span class="br0">)</span></span></span>. Padding is determined as follows: if <code>os.width()>1</code>, then <code>os.width()-1</code> copies of <code>os.fill()</code> are added to the output character to form the output character sequence.
If <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>out.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span><span class="sy3">&</span><a href="../ios_base/fmtflags.html"><span class="kw1683">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">adjustfield</span></span></a><span class="br0">)</span> <span class="sy1">==</span> <a href="../ios_base/fmtflags.html"><span class="kw1680">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">left</span></span></a></span></span>, the fill characters are placed after the output character, otherwise before. After insertion, <span class="t-c"><span class="mw-geshi cpp source-cpp">os.<span class="me1">width</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span></span></span> is called to cancel the effects of <span class="t-lc"><a href="../manip/setw.html" title="cpp/io/manip/setw">std::setw</a></span>, if any.</div>
<div class="t-li1"><span class="t-li">2)</span> Behaves as an <a href="../../concept/FormattedOutputFunction.html" title="cpp/concept/FormattedOutputFunction"><code>FormattedOutputFunction</code></a>. After constructing and checking the sentry object, inserts successive characters from the character array whose first element is pointed to by <code>s</code>.
<ul><li> for the first and third overloads (where <code>CharT</code> matches the type of <code>ch</code>), exactly <code>traits::length(s)</code> characters are inserted.
</li><li> for the second overload, exactly <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../string/char_traits.html"><span class="kw1264">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">length</span><span class="br0">(</span>s<span class="br0">)</span></span></span> characters are inserted.
</li><li> for the last two overloads, exactly <span class="t-c"><span class="mw-geshi cpp source-cpp">traits<span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span><span class="kw1">reinterpret_cast</span><span class="sy1"><</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span><span class="sy1">></span><span class="br0">(</span>s<span class="br0">)</span><span class="br0">)</span></span></span> are inserted.
</li></ul>
<p>Before insertion, first, all characters are widened using <span class="t-c"><span class="mw-geshi cpp source-cpp">os.<span class="me1">widen</span><span class="br0">(</span><span class="br0">)</span></span></span>, then padding is determined as follows: if the number of characters to insert is less than <code>os.width()</code>, then enough copies of <code>os.fill()</code> are added to the character sequence to make its length equal <code>os.width()</code>. If <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>out.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span><span class="sy3">&</span><a href="../ios_base/fmtflags.html"><span class="kw1683">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">adjustfield</span></span></a><span class="br0">)</span> <span class="sy1">==</span> <a href="../ios_base/fmtflags.html"><span class="kw1680">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">left</span></span></a></span></span>, the fill characters are added at the end of the output sequence, otherwise they are added before the output sequence.
After insertion, <span class="t-c"><span class="mw-geshi cpp source-cpp">width<span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span></span></span> is called to cancel the effects of <span class="t-lc"><a href="../manip/setw.html" title="cpp/io/manip/setw">std::setw</a></span>, if any.
</p>
The behavior is undefined if <code>s</code> is a null pointer.</div>
<div class="t-li1"><span class="t-li">3)</span> Calls the appropriate insertion operator, given an rvalue reference to an output stream object (equivalent to <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1"><<</span> value</span></span>). <span class="t-rev-inl t-since-cxx17"><span>This function template does not participate in overload resolution unless the expression <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1"><<</span> value</span></span> is well-formed.</span> <span><span class="t-mark-rev t-since-cxx17">(since C++17)</span></span></span></div>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="operator_ltlt2.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="operator_ltlt2.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="operator_ltlt2.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="operator_ltlt2.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="operator_ltlt2.html#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> os
</td>
<td> -
</td>
<td> output stream to insert data to
</td></tr>
<tr class="t-par">
<td> ch
</td>
<td> -
</td>
<td> reference to a character to insert
</td></tr>
<tr class="t-par">
<td> s
</td>
<td> -
</td>
<td> pointer to a character string to insert
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p><code>os</code>
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>Overload <span class="t-v">(3)</span> in LLVM libc++ implements <a rel="nofollow" class="external text" href="http://cplusplus.github.io/LWG/lwg-active.html#1203">LWG#1203</a> and returns a stream of the same type as the argument, so that code such as <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><a href="../basic_ostringstream.html"><span class="kw1733">std::<span class="me2">ostringstream</span></span></a><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="nu16">1.2</span><span class="br0">)</span>.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span></span></span> compiles.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <iostream></span>
<span class="co2">#include <fstream></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="../cout.html"><span class="kw1755">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Hello, world"</span> <span class="co1">// the const char* overload</span>
<span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span> <span class="co1">// the char overload</span>
<a href="../basic_ofstream.html"><span class="kw1730">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span><span class="st0">"test.txt"</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="nu16">1.2</span><span class="sy4">;</span> <span class="co1">// rvalue overload</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Hello, world</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&action=edit&section=5" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator_ltlt.html" title="cpp/io/basic ostream/operator ltlt"> <span class="t-lines"><span>operator<<</span></span></a></div></div>
</td>
<td> inserts formatted data <br /> <span class="t-mark">(public member 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/basic_ostream/dsc_operator_ltlt&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="../basic_ios/widen.html" title="cpp/io/basic ios/widen"> <span class="t-lines"><span>widen</span></span></a></div></div>
</td>
<td> widens characters <br /> <span class="t-mark">(public member function of <code>std::basic_ios</code>)</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/basic_ios/dsc_widen&action=edit">[edit]</a></span>
</td></tr>
</table>
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