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class="t-lines"><span>basic_ios</span></span></a></div></div></td></tr> 317<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_istream.html" title="cpp/io/basic istream"><span class="t-lines"><span>basic_istream</span></span></a></div></div></td></tr> 318<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ostream.html" title="cpp/io/basic ostream"><span class="t-lines"><span>basic_ostream</span></span></a></div></div></td></tr> 319<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> 320<tr class="t-nv-h2"><td colspan="5"> File I/O</td></tr> 321<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>basic_ifstream</span></span></strong></div></div></td></tr> 322<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> 323<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> 324<tr class="t-nv-h2"><td colspan="5"> String I/O</td></tr> 325<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> 326<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> 327<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> 328<tr class="t-nv-h2"><td colspan="5"> Array I/O</td></tr> 329<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ispanstream.html" title="cpp/io/basic ispanstream"><span class="t-lines"><span>basic_ispanstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr> 330<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ospanstream.html" title="cpp/io/basic ospanstream"><span class="t-lines"><span>basic_ospanstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr> 331<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_spanstream.html" title="cpp/io/basic spanstream"><span class="t-lines"><span>basic_spanstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr> 332<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-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr> 333<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-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr> 334<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-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr> 335<tr class="t-nv-h2"><td colspan="5"> Synchronized Output</td></tr> 336<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_osyncstream.html" title="cpp/io/basic osyncstream"><span class="t-lines"><span>basic_osyncstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr> 337<tr class="t-nv-h1"><td colspan="5"> Types</td></tr> 338<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> 339<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> 340<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> 341<tr class="t-nv-h1"><td colspan="5"> Error category interface</td></tr> 342<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> 343<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> 344</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/navbar_content&amp;action=edit">&#91;edit&#93;</a></span></div></div></div></div><div class="t-navbar-sep">&#160;</div><div class="t-navbar-head"><strong class="selflink"><tt>std::basic_ifstream</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style=""> 345<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr> 346<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/basic_ifstream.html" title="cpp/io/basic ifstream/basic ifstream"><span class="t-lines"><span>basic_ifstream::basic_ifstream</span></span></a></div></div></td></tr> 347<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/operator=.html" title="cpp/io/basic ifstream/operator="><span class="t-lines"><span>basic_ifstream::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> 348<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/swap.html" title="cpp/io/basic ifstream/swap"><span class="t-lines"><span>basic_ifstream::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> 349<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/rdbuf.html" title="cpp/io/basic ifstream/rdbuf"><span class="t-lines"><span>basic_ifstream::rdbuf</span></span></a></div></div></td></tr> 350<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/native_handle.html" title="cpp/io/basic ifstream/native handle"><span class="t-lines"><span>basic_ifstream::native_handle</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx26">(C++26)</span></span></span></div></div></td></tr> 351<tr class="t-nv-h2"><td colspan="5"> File operations </td></tr> 352<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/is_open.html" title="cpp/io/basic ifstream/is open"><span class="t-lines"><span>basic_ifstream::is_open</span></span></a></div></div></td></tr> 353<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/open.html" title="cpp/io/basic ifstream/open"><span class="t-lines"><span>basic_ifstream::open</span></span></a></div></div></td></tr> 354<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/close.html" title="cpp/io/basic ifstream/close"><span class="t-lines"><span>basic_ifstream::close</span></span></a></div></div></td></tr> 355<tr class="t-nv-h1"><td colspan="5"> Non-member functions </td></tr> 356<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/swap2.html" title="cpp/io/basic ifstream/swap2"><span class="t-lines"><span>swap<span class="t-dsc-small">(std::basic_ifstream)</span></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> 357</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ifstream/navbar_content&amp;action=edit">&#91;edit&#93;</a></span></div></div></div></div><div class="t-navbar-sep">&#160;</div></div> 358<table class="t-dcl-begin"><tbody> 359<tr class="t-dsc-header"> 360<td> <div>Defined in header <code><a href="../header/fstream.html" title="cpp/header/fstream">&lt;fstream&gt;</a></code> 361 </div></td> 362<td></td> 363<td></td> 364</tr> 365<tr class="t-dcl"> 366<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <br /> 367<p>&#160; &#160; <span class="kw1">class</span> CharT, <br /> 368&#160; &#160; <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="../string/char_traits.html"><span class="kw1270">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span><br /> 369</p> 370<span class="sy1">&gt;</span> <span class="kw1">class</span> basic_ifstream <span class="sy4">:</span> <span class="kw1">public</span> <a href="basic_istream.html"><span class="kw1717">std::<span class="me2">basic_istream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span></span></div></td> 371<td class="t-dcl-nopad"> </td> 372<td class="t-dcl-nopad"> </td> 373</tr> 374<tr class="t-dcl-sep"><td></td><td></td><td></td></tr> 375</tbody></table> 376<p>The class template <code>basic_ifstream</code> implements high-level input operations on file-based streams. It interfaces a file-based streambuffer (<span class="t-lc"><a href="basic_filebuf.html" title="cpp/io/basic filebuf">std::basic_filebuf</a></span>) with the high-level interface of (<span class="t-lc"><a href="basic_istream.html" title="cpp/io/basic istream">std::basic_istream</a></span>). 377</p><p>A typical implementation of <code>std::basic_ifstream</code> holds only one non-derived data member: an instance of <span class="mw-geshi cpp source-cpp"><a href="basic_filebuf.html"><span class="kw1671">std::<span class="me2">basic_filebuf</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span></span>. 378</p> 379<div class="t-inheritance-diagram"> 380<div class="center"><div class="noresize"><map name="ImageMap_1_1582003816"><area href="ios_base.html" shape="rect" coords="5,6,107,39" alt="cpp/io/ios base" title="cpp/io/ios base"/><area href="basic_ios.html" shape="rect" coords="135,4,252,42" alt="cpp/io/basic ios" title="cpp/io/basic ios"/><area href="basic_istream.html" shape="rect" coords="278,4,395,42" alt="cpp/io/basic istream" title="cpp/io/basic istream"/></map><img alt="std-basic ifstream-inheritance.svg" src="../../../../upload.cppreference.com/mwiki/images/7/79/std-basic_ifstream-inheritance.svg" width="543" height="45" usemap="#ImageMap_1_1582003816"/></div></div> 381<div style="text-align:center;"> 382<p><span style="font-size:0.7em; line-height:130%">Inheritance diagram</span> 383</p> 384</div> 385</div> 386<p>Several typedefs for common character types are provided: 387</p> 388<table class="t-dsc-begin"> 389 390<tr class="t-dsc-header"> 391<td colspan="2"> <div>Defined in header <code><a href="../header/fstream.html" title="cpp/header/fstream">&lt;fstream&gt;</a></code> </div> 392</td></tr> 393 394<tr class="t-dsc-hitem"> 395<td> Type 396</td> 397<td> Definition 398</td></tr> 399 400 401<tr class="t-dsc"> 402<td> <code>std::ifstream</code> 403</td> 404<td> <span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ifstream</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span> 405</td></tr> 406 407 408<tr class="t-dsc"> 409<td> <code>std::wifstream</code> 410</td> 411<td> <span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ifstream</span><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span> 412</td></tr> 413 414</table> 415<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div> 416<ul> 417<li class="toclevel-1"><a href="basic_ifstream.html#Member_types"><span class="tocnumber">1</span> <span class="toctext">Member types</span></a></li> 418<li class="toclevel-1 tocsection-1"><a href="basic_ifstream.html#Member_functions"><span class="tocnumber">2</span> <span class="toctext">Member functions</span></a> 419<ul> 420<li class="toclevel-2"><a href="basic_ifstream.html#File_operations"><span class="tocnumber">2.1</span> <span class="toctext">File operations</span></a></li> 421</ul> 422</li> 423<li class="toclevel-1 tocsection-2"><a href="basic_ifstream.html#Non-member_functions"><span class="tocnumber">3</span> <span class="toctext">Non-member functions</span></a></li> 424<li class="toclevel-1"><a href="basic_ifstream.html#Inherited_from_std::basic_istream"><span class="tocnumber">4</span> <span class="toctext">Inherited from <span>std::</span>basic_istream</span></a> 425<ul> 426<li class="toclevel-2"><a href="basic_ifstream.html#Member_functions_2"><span class="tocnumber">4.1</span> <span class="toctext">Member functions</span></a> 427<ul> 428<li class="toclevel-3"><a href="basic_ifstream.html#Formatted_input"><span class="tocnumber">4.1.1</span> <span class="toctext">Formatted input</span></a></li> 429<li class="toclevel-3"><a href="basic_ifstream.html#Unformatted_input"><span class="tocnumber">4.1.2</span> <span class="toctext">Unformatted input</span></a></li> 430<li class="toclevel-3"><a href="basic_ifstream.html#Positioning"><span class="tocnumber">4.1.3</span> <span class="toctext">Positioning</span></a></li> 431<li class="toclevel-3"><a href="basic_ifstream.html#Miscellaneous"><span class="tocnumber">4.1.4</span> <span class="toctext">Miscellaneous</span></a></li> 432</ul> 433</li> 434<li class="toclevel-2"><a href="basic_ifstream.html#Member_classes"><span class="tocnumber">4.2</span> <span class="toctext">Member classes</span></a></li> 435</ul> 436</li> 437<li class="toclevel-1"><a href="basic_ifstream.html#Inherited_from_std::basic_ios"><span class="tocnumber">5</span> <span class="toctext">Inherited from <span>std::</span>basic_ios</span></a> 438<ul> 439<li class="toclevel-2"><a href="basic_ifstream.html#Member_types_2"><span class="tocnumber">5.1</span> <span class="toctext">Member types</span></a></li> 440<li class="toclevel-2"><a href="basic_ifstream.html#Member_functions_3"><span class="tocnumber">5.2</span> <span class="toctext">Member functions</span></a> 441<ul> 442<li class="toclevel-3"><a href="basic_ifstream.html#State_functions"><span class="tocnumber">5.2.1</span> <span class="toctext">State functions</span></a></li> 443<li class="toclevel-3"><a href="basic_ifstream.html#Formatting"><span class="tocnumber">5.2.2</span> <span class="toctext">Formatting</span></a></li> 444<li class="toclevel-3"><a href="basic_ifstream.html#Miscellaneous_2"><span class="tocnumber">5.2.3</span> <span class="toctext">Miscellaneous</span></a></li> 445</ul> 446</li> 447</ul> 448</li> 449<li class="toclevel-1"><a href="basic_ifstream.html#Inherited_from_std::ios_base"><span class="tocnumber">6</span> <span class="toctext">Inherited from <span>std::</span>ios_base</span></a> 450<ul> 451<li class="toclevel-2"><a href="basic_ifstream.html#Member_functions_4"><span class="tocnumber">6.1</span> <span class="toctext">Member functions</span></a> 452<ul> 453<li class="toclevel-3"><a href="basic_ifstream.html#Formatting_2"><span class="tocnumber">6.1.1</span> <span class="toctext">Formatting</span></a></li> 454<li class="toclevel-3"><a href="basic_ifstream.html#Locales"><span class="tocnumber">6.1.2</span> <span class="toctext">Locales</span></a></li> 455<li class="toclevel-3"><a href="basic_ifstream.html#Internal_extensible_array"><span class="tocnumber">6.1.3</span> <span class="toctext">Internal extensible array</span></a></li> 456<li class="toclevel-3"><a href="basic_ifstream.html#Miscellaneous_3"><span class="tocnumber">6.1.4</span> <span class="toctext">Miscellaneous</span></a></li> 457<li class="toclevel-3"><a href="basic_ifstream.html#Member_classes_2"><span class="tocnumber">6.1.5</span> <span class="toctext">Member classes</span></a></li> 458</ul> 459</li> 460<li class="toclevel-2"><a href="basic_ifstream.html#Member_types_and_constants"><span class="tocnumber">6.2</span> <span class="toctext">Member types and constants</span></a></li> 461<li class="toclevel-2 tocsection-3"><a href="basic_ifstream.html#Notes"><span class="tocnumber">6.3</span> <span class="toctext">Notes</span></a></li> 462<li class="toclevel-2 tocsection-4"><a href="basic_ifstream.html#Example"><span class="tocnumber">6.4</span> <span class="toctext">Example</span></a></li> 463</ul> 464</li> 465</ul> 466</td></tr></table> 467<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/member_types&amp;action=edit&amp;section=T-1" title="Template:cpp/io/member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span></h3> 468<table class="t-dsc-begin"> 469 470<tr class="t-dsc-hitem"> 471<td> Member type 472</td> 473<td> Definition 474</td></tr> 475 476 477<tr class="t-dsc"> 478<td> <code>char_type</code> 479</td> 480<td> <code>CharT</code><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_char_type&amp;action=edit">&#91;edit&#93;</a></span> 481</td></tr> 482 483<tr class="t-dsc"> 484<td> <code>traits_type</code> 485</td> 486<td> <code>Traits</code>; the program is ill-formed if <code>Traits::char_type</code> is not <code>CharT</code>.<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_traits_type&amp;action=edit">&#91;edit&#93;</a></span> 487</td></tr> 488 489<tr class="t-dsc"> 490<td> <code>int_type</code> 491</td> 492<td> <code>Traits::int_type</code><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_int_type&amp;action=edit">&#91;edit&#93;</a></span> 493</td></tr> 494 495<tr class="t-dsc"> 496<td> <code>pos_type</code> 497</td> 498<td> <code>Traits::pos_type</code><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_pos_type&amp;action=edit">&#91;edit&#93;</a></span> 499</td></tr> 500 501<tr class="t-dsc"> 502<td> <code>off_type</code> 503</td> 504<td> <code>Traits::off_type</code><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_off_type&amp;action=edit">&#91;edit&#93;</a></span> 505</td></tr> 506 507<tr class="t-dsc"> 508<td> <code>native_handle_type</code><span class="t-mark-rev t-since-cxx26">(C++26)</span> 509</td> 510<td> <i>implementation-defined</i> type that is <a href="../named_req/TriviallyCopyable.html" title="cpp/named req/TriviallyCopyable"><span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">TriviallyCopyable</span></a> and <a href="../concepts/semiregular.html" title="cpp/concepts/semiregular"><code>semiregular</code></a><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_native_handle_type&amp;action=edit">&#91;edit&#93;</a></span> 511</td></tr> 512</table> 513<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&amp;action=edit&amp;section=1" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span></h3> 514<table class="t-dsc-begin"> 515 516<tr class="t-dsc"> 517<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="basic_ifstream/basic_ifstream.html" title="cpp/io/basic ifstream/basic ifstream"> <span class="t-lines"><span>(constructor)</span></span></a></div></div> 518</td> 519<td> constructs the file stream <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_constructor&amp;action=edit">&#91;edit&#93;</a></span> 520</td></tr> 521 522<tr class="t-dsc"> 523<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><span class="t-lines"><span>(destructor)</span></span></div><div><span class="t-lines"><span><span class="t-cmark">[virtual]</span> <span class="t-mark">(implicitly declared)</span></span></span></div></div> 524</td> 525<td> destructs the <code>basic_ifstream</code> and the associated buffer, closes the file <br /> <span class="t-mark">(virtual public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_destructor&amp;action=edit">&#91;edit&#93;</a></span> 526</td></tr> 527 528<tr class="t-dsc"> 529<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/operator=.html" title="cpp/io/basic ifstream/operator="> <span class="t-lines"><span>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> 530</td> 531<td> moves the file stream <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_operator%3D&amp;action=edit">&#91;edit&#93;</a></span> 532</td></tr> 533 534<tr class="t-dsc"> 535<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/swap.html" title="cpp/io/basic ifstream/swap"> <span class="t-lines"><span>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> 536</td> 537<td> swaps two file streams <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_swap&amp;action=edit">&#91;edit&#93;</a></span> 538</td></tr> 539 540<tr class="t-dsc"> 541<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/rdbuf.html" title="cpp/io/basic ifstream/rdbuf"> <span class="t-lines"><span>rdbuf</span></span></a></div></div> 542</td> 543<td> returns the underlying raw file device object <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_rdbuf&amp;action=edit">&#91;edit&#93;</a></span> 544</td></tr> 545 546<tr class="t-dsc"> 547<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/native_handle.html" title="cpp/io/basic ifstream/native handle"> <span class="t-lines"><span>native_handle</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx26">(C++26)</span></span></span></div></div> 548</td> 549<td> returns the underlying implementation-defined handle <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ifstream/dsc_native_handle&amp;action=edit">&#91;edit&#93;</a></span> 550</td></tr> 551 552 553<tr> 554<td colspan="2"> <h5> <span class="mw-headline" id="File_operations"> File operations </span></h5> 555</td></tr> 556 557<tr class="t-dsc"> 558<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/is_open.html" title="cpp/io/basic ifstream/is open"> <span class="t-lines"><span>is_open</span></span></a></div></div> 559</td> 560<td> checks if the stream has an associated file <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_is_open&amp;action=edit">&#91;edit&#93;</a></span> 561</td></tr> 562 563<tr class="t-dsc"> 564<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/open.html" title="cpp/io/basic ifstream/open"> <span class="t-lines"><span>open</span></span></a></div></div> 565</td> 566<td> opens a file and associates it with the stream <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_open&amp;action=edit">&#91;edit&#93;</a></span> 567</td></tr> 568 569<tr class="t-dsc"> 570<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/close.html" title="cpp/io/basic ifstream/close"> <span class="t-lines"><span>close</span></span></a></div></div> 571</td> 572<td> closes the associated file <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="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_close&amp;action=edit">&#91;edit&#93;</a></span> 573</td></tr> 574</table> 575<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&amp;action=edit&amp;section=2" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span></h3> 576<table class="t-dsc-begin"> 577 578<tr class="t-dsc"> 579<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/swap2.html" title="cpp/io/basic ifstream/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::basic_ifstream)</span></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> 580</td> 581<td> specializes the <span class="t-lc"><a href="../algorithm/swap.html" title="cpp/algorithm/swap">std::swap</a></span> algorithm <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_swap2&amp;action=edit">&#91;edit&#93;</a></span> 582</td></tr> 583</table> 584<div class="t-inherited"> 585<h2> <span class="mw-headline" id="Inherited_from_std::basic_istream">Inherited from <a href="basic_istream.html" title="cpp/io/basic istream"> <span style="font-size:0.7em; line-height:130%">std::</span>basic_istream</a> </span></h2> 586<h3> <span class="mw-headline" id="Member_functions_2">Member functions</span></h3> 587<table class="t-dsc-begin"> 588 589<tr> 590<td colspan="2"> <h5> <span class="mw-headline" id="Formatted_input"> Formatted input </span></h5> 591</td></tr> 592 593<tr class="t-dsc"> 594<td> <div class="t-dsc-member-div"><div><a href="basic_istream/operator_gtgt.html" title="cpp/io/basic istream/operator gtgt"> <span class="t-lines"><span>operator&gt;&gt;</span></span></a></div></div> 595</td> 596<td> extracts formatted data <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_operator_gtgt&amp;action=edit">&#91;edit&#93;</a></span> 597</td></tr> 598 599 600<tr> 601<td colspan="2"> <h5> <span class="mw-headline" id="Unformatted_input"> Unformatted input </span></h5> 602</td></tr> 603 604<tr class="t-dsc"> 605<td> <div class="t-dsc-member-div"><div><a href="basic_istream/get.html" title="cpp/io/basic istream/get"> <span class="t-lines"><span>get</span></span></a></div></div> 606</td> 607<td> extracts characters <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_get&amp;action=edit">&#91;edit&#93;</a></span> 608</td></tr> 609 610<tr class="t-dsc"> 611<td> <div class="t-dsc-member-div"><div><a href="basic_istream/peek.html" title="cpp/io/basic istream/peek"> <span class="t-lines"><span>peek</span></span></a></div></div> 612</td> 613<td> reads the next character without extracting it <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_peek&amp;action=edit">&#91;edit&#93;</a></span> 614</td></tr> 615 616<tr class="t-dsc"> 617<td> <div class="t-dsc-member-div"><div><a href="basic_istream/unget.html" title="cpp/io/basic istream/unget"> <span class="t-lines"><span>unget</span></span></a></div></div> 618</td> 619<td> unextracts a character <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_unget&amp;action=edit">&#91;edit&#93;</a></span> 620</td></tr> 621 622<tr class="t-dsc"> 623<td> <div class="t-dsc-member-div"><div><a href="basic_istream/putback.html" title="cpp/io/basic istream/putback"> <span class="t-lines"><span>putback</span></span></a></div></div> 624</td> 625<td> puts a character into input stream <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_putback&amp;action=edit">&#91;edit&#93;</a></span> 626</td></tr> 627 628<tr class="t-dsc"> 629<td> <div class="t-dsc-member-div"><div><a href="basic_istream/getline.html" title="cpp/io/basic istream/getline"> <span class="t-lines"><span>getline</span></span></a></div></div> 630</td> 631<td> extracts characters until the given character is found <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_getline&amp;action=edit">&#91;edit&#93;</a></span> 632</td></tr> 633 634<tr class="t-dsc"> 635<td> <div class="t-dsc-member-div"><div><a href="basic_istream/ignore.html" title="cpp/io/basic istream/ignore"> <span class="t-lines"><span>ignore</span></span></a></div></div> 636</td> 637<td> extracts and discards characters until the given character is found <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_ignore&amp;action=edit">&#91;edit&#93;</a></span> 638</td></tr> 639 640<tr class="t-dsc"> 641<td> <div class="t-dsc-member-div"><div><a href="basic_istream/read.html" title="cpp/io/basic istream/read"> <span class="t-lines"><span>read</span></span></a></div></div> 642</td> 643<td> extracts blocks of characters <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_read&amp;action=edit">&#91;edit&#93;</a></span> 644</td></tr> 645 646<tr class="t-dsc"> 647<td> <div class="t-dsc-member-div"><div><a href="basic_istream/readsome.html" title="cpp/io/basic istream/readsome"> <span class="t-lines"><span>readsome</span></span></a></div></div> 648</td> 649<td> extracts already available blocks of characters <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_readsome&amp;action=edit">&#91;edit&#93;</a></span> 650</td></tr> 651 652<tr class="t-dsc"> 653<td> <div class="t-dsc-member-div"><div><a href="basic_istream/gcount.html" title="cpp/io/basic istream/gcount"> <span class="t-lines"><span>gcount</span></span></a></div></div> 654</td> 655<td> returns number of characters extracted by last unformatted input operation <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_gcount&amp;action=edit">&#91;edit&#93;</a></span> 656</td></tr> 657 658 659<tr> 660<td colspan="2"> <h5> <span class="mw-headline" id="Positioning"> Positioning </span></h5> 661</td></tr> 662 663<tr class="t-dsc"> 664<td> <div class="t-dsc-member-div"><div><a href="basic_istream/tellg.html" title="cpp/io/basic istream/tellg"> <span class="t-lines"><span>tellg</span></span></a></div></div> 665</td> 666<td> returns the input position indicator <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_tellg&amp;action=edit">&#91;edit&#93;</a></span> 667</td></tr> 668 669<tr class="t-dsc"> 670<td> <div class="t-dsc-member-div"><div><a href="basic_istream/seekg.html" title="cpp/io/basic istream/seekg"> <span class="t-lines"><span>seekg</span></span></a></div></div> 671</td> 672<td> sets the input position indicator <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_seekg&amp;action=edit">&#91;edit&#93;</a></span> 673</td></tr> 674 675 676<tr> 677<td colspan="2"> <h5> <span class="mw-headline" id="Miscellaneous"> Miscellaneous </span></h5> 678</td></tr> 679 680<tr class="t-dsc"> 681<td> <div class="t-dsc-member-div"><div><a href="basic_istream/sync.html" title="cpp/io/basic istream/sync"> <span class="t-lines"><span>sync</span></span></a></div></div> 682</td> 683<td> synchronizes with the underlying storage device <br /> <span class="t-mark">(public member function of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_sync&amp;action=edit">&#91;edit&#93;</a></span> 684</td></tr> 685</table> 686<h3> <span class="mw-headline" id="Member_classes">Member classes</span></h3> 687<table class="t-dsc-begin"> 688 689<tr class="t-dsc"> 690<td> <div class="t-dsc-member-div"><div><a href="basic_istream/sentry.html" title="cpp/io/basic istream/sentry"> <span class="t-lines"><span>sentry</span></span></a></div></div> 691</td> 692<td> implements basic logic for preparation of the stream for input operations <br /> <span class="t-mark">(public member class of <code>std::basic_istream&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_sentry&amp;action=edit">&#91;edit&#93;</a></span> 693</td></tr> 694</table> 695</div> 696<div class="t-inherited"> 697<h2> <span class="mw-headline" id="Inherited_from_std::basic_ios">Inherited from <a href="basic_ios.html" title="cpp/io/basic ios"> <span style="font-size:0.7em; line-height:130%">std::</span>basic_ios</a> </span></h2> 698<h3> <span class="mw-headline" id="Member_types_2">Member types</span></h3> 699<table class="t-dsc-begin"> 700 701<tr class="t-dsc-hitem"> 702<td> Member type 703</td> 704<td> Definition 705</td></tr> 706 707 708<tr class="t-dsc"> 709<td> <code>char_type</code> 710</td> 711<td> <code>CharT</code> 712</td></tr> 713 714 715<tr class="t-dsc"> 716<td> <code>traits_type</code> 717</td> 718<td> <code>Traits</code> 719</td></tr> 720 721 722<tr class="t-dsc"> 723<td> <code>int_type</code> 724</td> 725<td> <code>Traits::int_type</code> 726</td></tr> 727 728 729<tr class="t-dsc"> 730<td> <code>pos_type</code> 731</td> 732<td> <code>Traits::pos_type</code> 733</td></tr> 734 735 736<tr class="t-dsc"> 737<td> <code>off_type</code> 738</td> 739<td> <code>Traits::off_type</code> 740</td></tr> 741 742</table> 743<h3> <span class="mw-headline" id="Member_functions_3">Member functions</span></h3> 744<table class="t-dsc-begin"> 745 746<tr> 747<td colspan="2"> <h5> <span class="mw-headline" id="State_functions"> State functions </span></h5> 748</td></tr> 749 750<tr class="t-dsc"> 751<td> <div class="t-dsc-member-div"><div><a href="basic_ios/good.html" title="cpp/io/basic ios/good"> <span class="t-lines"><span>good</span></span></a></div></div> 752</td> 753<td> checks if no error has occurred i.e. I/O operations are available <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_good&amp;action=edit">&#91;edit&#93;</a></span> 754</td></tr> 755 756<tr class="t-dsc"> 757<td> <div class="t-dsc-member-div"><div><a href="basic_ios/eof.html" title="cpp/io/basic ios/eof"> <span class="t-lines"><span>eof</span></span></a></div></div> 758</td> 759<td> checks if end-of-file has been reached <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_eof&amp;action=edit">&#91;edit&#93;</a></span> 760</td></tr> 761 762<tr class="t-dsc"> 763<td> <div class="t-dsc-member-div"><div><a href="basic_ios/fail.html" title="cpp/io/basic ios/fail"> <span class="t-lines"><span>fail</span></span></a></div></div> 764</td> 765<td> checks if an error has occurred <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_fail&amp;action=edit">&#91;edit&#93;</a></span> 766</td></tr> 767 768<tr class="t-dsc"> 769<td> <div class="t-dsc-member-div"><div><a href="basic_ios/bad.html" title="cpp/io/basic ios/bad"> <span class="t-lines"><span>bad</span></span></a></div></div> 770</td> 771<td> checks if a non-recoverable error has occurred <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_bad&amp;action=edit">&#91;edit&#93;</a></span> 772</td></tr> 773 774<tr class="t-dsc"> 775<td> <div class="t-dsc-member-div"><div><a href="basic_ios/operator!.html" title="cpp/io/basic ios/operator!"> <span class="t-lines"><span>operator!</span></span></a></div></div> 776</td> 777<td> checks if an error has occurred (synonym of <span class="t-lc"><a href="basic_ios/fail.html" title="cpp/io/basic ios/fail">fail()</a></span>) <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_operator!&amp;action=edit">&#91;edit&#93;</a></span> 778</td></tr> 779 780<tr class="t-dsc"> 781<td> <div class="t-dsc-member-div"><div><a href="basic_ios/operator_bool.html" title="cpp/io/basic ios/operator bool"> <span class="t-lines"><span>operator bool</span></span></a></div></div> 782</td> 783<td> checks if no error has occurred (synonym of <code>!</code><span class="t-lc"><a href="basic_ios/fail.html" title="cpp/io/basic ios/fail">fail()</a></span>) <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_operator_bool&amp;action=edit">&#91;edit&#93;</a></span> 784</td></tr> 785 786<tr class="t-dsc"> 787<td> <div class="t-dsc-member-div"><div><a href="basic_ios/rdstate.html" title="cpp/io/basic ios/rdstate"> <span class="t-lines"><span>rdstate</span></span></a></div></div> 788</td> 789<td> returns state flags <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_rdstate&amp;action=edit">&#91;edit&#93;</a></span> 790</td></tr> 791 792<tr class="t-dsc"> 793<td> <div class="t-dsc-member-div"><div><a href="basic_ios/setstate.html" title="cpp/io/basic ios/setstate"> <span class="t-lines"><span>setstate</span></span></a></div></div> 794</td> 795<td> sets state flags <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_setstate&amp;action=edit">&#91;edit&#93;</a></span> 796</td></tr> 797 798<tr class="t-dsc"> 799<td> <div class="t-dsc-member-div"><div><a href="basic_ios/clear.html" title="cpp/io/basic ios/clear"> <span class="t-lines"><span>clear</span></span></a></div></div> 800</td> 801<td> modifies state flags <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_clear&amp;action=edit">&#91;edit&#93;</a></span> 802</td></tr> 803 804 805<tr> 806<td colspan="2"> <h5> <span class="mw-headline" id="Formatting"> Formatting </span></h5> 807</td></tr> 808 809<tr class="t-dsc"> 810<td> <div class="t-dsc-member-div"><div><a href="basic_ios/copyfmt.html" title="cpp/io/basic ios/copyfmt"> <span class="t-lines"><span>copyfmt</span></span></a></div></div> 811</td> 812<td> copies formatting information <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_copyfmt&amp;action=edit">&#91;edit&#93;</a></span> 813</td></tr> 814 815<tr class="t-dsc"> 816<td> <div class="t-dsc-member-div"><div><a href="basic_ios/fill.html" title="cpp/io/basic ios/fill"> <span class="t-lines"><span>fill</span></span></a></div></div> 817</td> 818<td> manages the fill character <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_fill&amp;action=edit">&#91;edit&#93;</a></span> 819</td></tr> 820 821 822<tr> 823<td colspan="2"> <h5> <span class="mw-headline" id="Miscellaneous_2"> Miscellaneous </span></h5> 824</td></tr> 825 826<tr class="t-dsc"> 827<td> <div class="t-dsc-member-div"><div><a href="basic_ios/exceptions.html" title="cpp/io/basic ios/exceptions"> <span class="t-lines"><span>exceptions</span></span></a></div></div> 828</td> 829<td> manages exception mask <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_exceptions&amp;action=edit">&#91;edit&#93;</a></span> 830</td></tr> 831 832<tr class="t-dsc"> 833<td> <div class="t-dsc-member-div"><div><a href="basic_ios/imbue.html" title="cpp/io/basic ios/imbue"> <span class="t-lines"><span>imbue</span></span></a></div></div> 834</td> 835<td> sets the locale <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_imbue&amp;action=edit">&#91;edit&#93;</a></span> 836</td></tr> 837 838<tr class="t-dsc"> 839<td> <div class="t-dsc-member-div"><div><a href="basic_ios/rdbuf.html" title="cpp/io/basic ios/rdbuf"> <span class="t-lines"><span>rdbuf</span></span></a></div></div> 840</td> 841<td> manages associated stream buffer <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_rdbuf&amp;action=edit">&#91;edit&#93;</a></span> 842</td></tr> 843 844<tr class="t-dsc"> 845<td> <div class="t-dsc-member-div"><div><a href="basic_ios/tie.html" title="cpp/io/basic ios/tie"> <span class="t-lines"><span>tie</span></span></a></div></div> 846</td> 847<td> manages tied stream <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_tie&amp;action=edit">&#91;edit&#93;</a></span> 848</td></tr> 849 850<tr class="t-dsc"> 851<td> <div class="t-dsc-member-div"><div><a href="basic_ios/narrow.html" title="cpp/io/basic ios/narrow"> <span class="t-lines"><span>narrow</span></span></a></div></div> 852</td> 853<td> narrows characters <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_narrow&amp;action=edit">&#91;edit&#93;</a></span> 854</td></tr> 855 856<tr class="t-dsc"> 857<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> 858</td> 859<td> widens characters <br /> <span class="t-mark">(public member function of <code>std::basic_ios&lt;CharT,Traits&gt;</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_widen&amp;action=edit">&#91;edit&#93;</a></span> 860</td></tr> 861</table> 862</div> 863<div class="t-inherited"> 864<h2> <span class="mw-headline" id="Inherited_from_std::ios_base">Inherited from <a href="ios_base.html" title="cpp/io/ios base"> <span style="font-size:0.7em; line-height:130%">std::</span>ios_base</a> </span></h2> 865<h3> <span class="mw-headline" id="Member_functions_4">Member functions</span></h3> 866<table class="t-dsc-begin"> 867 868 869<tr> 870<td colspan="2"> <h5> <span class="mw-headline" id="Formatting_2"> Formatting </span></h5> 871</td></tr> 872 873<tr class="t-dsc"> 874<td> <div class="t-dsc-member-div"><div><a href="ios_base/flags.html" title="cpp/io/ios base/flags"> <span class="t-lines"><span>flags</span></span></a></div></div> 875</td> 876<td> manages format flags <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_flags&amp;action=edit">&#91;edit&#93;</a></span> 877</td></tr> 878 879<tr class="t-dsc"> 880<td> <div class="t-dsc-member-div"><div><a href="ios_base/setf.html" title="cpp/io/ios base/setf"> <span class="t-lines"><span>setf</span></span></a></div></div> 881</td> 882<td> sets specific format flag <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_setf&amp;action=edit">&#91;edit&#93;</a></span> 883</td></tr> 884 885<tr class="t-dsc"> 886<td> <div class="t-dsc-member-div"><div><a href="ios_base/unsetf.html" title="cpp/io/ios base/unsetf"> <span class="t-lines"><span>unsetf</span></span></a></div></div> 887</td> 888<td> clears specific format flag <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_unsetf&amp;action=edit">&#91;edit&#93;</a></span> 889</td></tr> 890 891<tr class="t-dsc"> 892<td> <div class="t-dsc-member-div"><div><a href="ios_base/precision.html" title="cpp/io/ios base/precision"> <span class="t-lines"><span>precision</span></span></a></div></div> 893</td> 894<td> manages decimal precision of floating point operations <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_precision&amp;action=edit">&#91;edit&#93;</a></span> 895</td></tr> 896 897<tr class="t-dsc"> 898<td> <div class="t-dsc-member-div"><div><a href="ios_base/width.html" title="cpp/io/ios base/width"> <span class="t-lines"><span>width</span></span></a></div></div> 899</td> 900<td> manages field width <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_width&amp;action=edit">&#91;edit&#93;</a></span> 901</td></tr> 902 903 904<tr> 905<td colspan="2"> <h5> <span class="mw-headline" id="Locales"> Locales </span></h5> 906</td></tr> 907 908<tr class="t-dsc"> 909<td> <div class="t-dsc-member-div"><div><a href="ios_base/imbue.html" title="cpp/io/ios base/imbue"> <span class="t-lines"><span>imbue</span></span></a></div></div> 910</td> 911<td> sets locale <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_imbue&amp;action=edit">&#91;edit&#93;</a></span> 912</td></tr> 913 914<tr class="t-dsc"> 915<td> <div class="t-dsc-member-div"><div><a href="ios_base/getloc.html" title="cpp/io/ios base/getloc"> <span class="t-lines"><span>getloc</span></span></a></div></div> 916</td> 917<td> returns current locale <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_getloc&amp;action=edit">&#91;edit&#93;</a></span> 918</td></tr> 919 920 921<tr> 922<td colspan="2"> <h5> <span class="mw-headline" id="Internal_extensible_array"> Internal extensible array </span></h5> 923</td></tr> 924 925<tr class="t-dsc"> 926<td> <div class="t-dsc-member-div"><div><a href="ios_base/xalloc.html" title="cpp/io/ios base/xalloc"> <span class="t-lines"><span>xalloc</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div> 927</td> 928<td> returns a program-wide unique integer that is safe to use as index to <a href="ios_base/pword.html" title="cpp/io/ios base/pword"><tt>pword()</tt></a> and <a href="ios_base/iword.html" title="cpp/io/ios base/iword"><tt>iword()</tt></a> <br /> <span class="t-mark">(public static member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_xalloc&amp;action=edit">&#91;edit&#93;</a></span> 929</td></tr> 930 931<tr class="t-dsc"> 932<td> <div class="t-dsc-member-div"><div><a href="ios_base/iword.html" title="cpp/io/ios base/iword"> <span class="t-lines"><span>iword</span></span></a></div></div> 933</td> 934<td> resizes the private storage if necessary and access to the <span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span> element at the given index <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iword&amp;action=edit">&#91;edit&#93;</a></span> 935</td></tr> 936 937<tr class="t-dsc"> 938<td> <div class="t-dsc-member-div"><div><a href="ios_base/pword.html" title="cpp/io/ios base/pword"> <span class="t-lines"><span>pword</span></span></a></div></div> 939</td> 940<td> resizes the private storage if necessary and access to the <span class="mw-geshi cpp source-cpp"><span class="kw4">void</span><span class="sy2">*</span></span> element at the given index <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_pword&amp;action=edit">&#91;edit&#93;</a></span> 941</td></tr> 942 943 944<tr> 945<td colspan="2"> <h5> <span class="mw-headline" id="Miscellaneous_3"> Miscellaneous </span></h5> 946</td></tr> 947 948<tr class="t-dsc"> 949<td> <div class="t-dsc-member-div"><div><a href="ios_base/register_callback.html" title="cpp/io/ios base/register callback"> <span class="t-lines"><span>register_callback</span></span></a></div></div> 950</td> 951<td> registers event callback function <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_register_callback&amp;action=edit">&#91;edit&#93;</a></span> 952</td></tr> 953 954<tr class="t-dsc"> 955<td> <div class="t-dsc-member-div"><div><a href="ios_base/sync_with_stdio.html" title="cpp/io/ios base/sync with stdio"> <span class="t-lines"><span>sync_with_stdio</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div> 956</td> 957<td> sets whether C++ and C I/O libraries are interoperable <br /> <span class="t-mark">(public static member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_sync_with_stdio&amp;action=edit">&#91;edit&#93;</a></span> 958</td></tr> 959 960 961<tr> 962<td colspan="2"> <h5> <span class="mw-headline" id="Member_classes_2"> Member classes </span></h5> 963</td></tr> 964 965<tr class="t-dsc"> 966<td> <div class="t-dsc-member-div"><div><a href="ios_base/failure.html" title="cpp/io/ios base/failure"> <span class="t-lines"><span>failure</span></span></a></div></div> 967</td> 968<td> stream exception <br /> <span class="t-mark">(public member class of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_failure&amp;action=edit">&#91;edit&#93;</a></span> 969</td></tr> 970 971<tr class="t-dsc"> 972<td> <div class="t-dsc-member-div"><div><a href="ios_base/Init.html" title="cpp/io/ios base/Init"> <span class="t-lines"><span>Init</span></span></a></div></div> 973</td> 974<td> initializes standard stream objects <br /> <span class="t-mark">(public member class of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_Init&amp;action=edit">&#91;edit&#93;</a></span> 975</td></tr> 976</table> 977<table class="t-dsc-begin"> 978 979<tr> 980<td colspan="2"> <h3> <span class="mw-headline" id="Member_types_and_constants"> Member types and constants</span></h3> 981</td></tr> 982 983<tr class="t-dsc-hitem"> 984<td> Type 985</td> 986<td> Explanation 987</td></tr> 988 989 990<tr class="t-dsc"> 991<td> <div class="t-dsc-member-div"><div><a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"> <span class="t-lines"><span>openmode</span></span></a></div></div> 992</td> 993<td> stream open mode type 994<p>The following constants are also defined: 995</p> 996<table class="t-dsc-begin"> 997 998<tr class="t-dsc-hitem"> 999<td> Constant 1000</td> 1001<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1002</td></tr> 1003 1004 1005<tr class="t-dsc"> 1006<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>app</tt></a> 1007</td> 1008<td> seek to the end of stream before each write<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1009</td></tr> 1010 1011 1012<tr class="t-dsc"> 1013<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>binary</tt></a> 1014</td> 1015<td> open in <a href="c/FILE.html#Binary_and_text_modes" title="cpp/io/c/FILE">binary mode</a><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1016</td></tr> 1017 1018 1019<tr class="t-dsc"> 1020<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>in</tt></a> 1021</td> 1022<td> open for reading<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1023</td></tr> 1024 1025 1026<tr class="t-dsc"> 1027<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>out</tt></a> 1028</td> 1029<td> open for writing<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1030</td></tr> 1031 1032 1033<tr class="t-dsc"> 1034<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>trunc</tt></a> 1035</td> 1036<td> discard the contents of the stream when opening<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1037</td></tr> 1038 1039 1040<tr class="t-dsc"> 1041<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>ate</tt></a> 1042</td> 1043<td> seek to the end of stream immediately after open<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1044</td></tr> 1045 1046 1047<tr class="t-dsc"> 1048<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>noreplace</tt></a> <span class="t-mark-rev t-since-cxx23">(C++23)</span> 1049</td> 1050<td> open in exclusive mode<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1051</td></tr> 1052 1053</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&amp;action=edit">&#91;edit&#93;</a></span> 1054</td></tr> 1055 1056<tr class="t-dsc"> 1057<td> <div class="t-dsc-member-div"><div><a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"> <span class="t-lines"><span>fmtflags</span></span></a></div></div> 1058</td> 1059<td> formatting flags type 1060<p>The following constants are also defined: 1061</p> 1062<table class="t-dsc-begin"> 1063 1064<tr class="t-dsc-hitem"> 1065<td> Constant 1066</td> 1067<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1068</td></tr> 1069 1070 1071<tr class="t-dsc"> 1072<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>dec</tt></a> 1073</td> 1074<td> use decimal base for integer I/O: see <span class="t-lc"><a href="manip/hex.html" title="cpp/io/manip/hex">std::dec</a></span><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1075</td></tr> 1076 1077 1078<tr class="t-dsc"> 1079<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>oct</tt></a> 1080</td> 1081<td> use octal base for integer I/O: see <span class="t-lc"><a href="manip/hex.html" title="cpp/io/manip/hex">std::oct</a></span><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1082</td></tr> 1083 1084 1085<tr class="t-dsc"> 1086<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>hex</tt></a> 1087</td> 1088<td> use hexadecimal base for integer I/O: see <span class="t-lc"><a href="manip/hex.html" title="cpp/io/manip/hex">std::hex</a></span><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1089</td></tr> 1090 1091 1092<tr class="t-dsc"> 1093<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>basefield</tt></a> 1094</td> 1095<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">dec <span class="sy3">|</span> oct <span class="sy3">|</span> hex</span></span>. Useful for masking operations<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1096</td></tr> 1097 1098 1099<tr class="t-dsc"> 1100<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>left</tt></a> 1101</td> 1102<td> left adjustment (adds fill characters to the right): see <span class="t-lc"><a href="manip/left.html" title="cpp/io/manip/left">std::left</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1103</td></tr> 1104 1105 1106<tr class="t-dsc"> 1107<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>right</tt></a> 1108</td> 1109<td> right adjustment (adds fill characters to the left): see <span class="t-lc"><a href="manip/left.html" title="cpp/io/manip/left">std::right</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1110</td></tr> 1111 1112 1113<tr class="t-dsc"> 1114<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>internal</tt></a> 1115</td> 1116<td> internal adjustment (adds fill characters to the internal designated point): see <span class="t-lc"><a href="manip/left.html" title="cpp/io/manip/left">std::internal</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1117</td></tr> 1118 1119 1120<tr class="t-dsc"> 1121<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>adjustfield</tt></a> 1122</td> 1123<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">left <span class="sy3">|</span> right <span class="sy3">|</span> internal</span></span>. Useful for masking operations <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1124</td></tr> 1125 1126 1127<tr class="t-dsc"> 1128<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>scientific</tt></a> 1129</td> 1130<td> generate floating point types using scientific notation, or hex notation if combined with <span class="t-c"><span class="mw-geshi cpp source-cpp">fixed</span></span>: see <span class="t-lc"><a href="manip/fixed.html" title="cpp/io/manip/fixed">std::scientific</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1131</td></tr> 1132 1133 1134<tr class="t-dsc"> 1135<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>fixed</tt></a> 1136</td> 1137<td> generate floating point types using fixed notation, or hex notation if combined with <span class="t-c"><span class="mw-geshi cpp source-cpp">scientific</span></span>: see <span class="t-lc"><a href="manip/fixed.html" title="cpp/io/manip/fixed">std::fixed</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1138</td></tr> 1139 1140 1141<tr class="t-dsc"> 1142<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>floatfield</tt></a> 1143</td> 1144<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">scientific <span class="sy3">|</span> fixed</span></span>. Useful for masking operations <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1145</td></tr> 1146 1147 1148<tr class="t-dsc"> 1149<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>boolalpha</tt></a> 1150</td> 1151<td> insert and extract <span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span> type in alphanumeric format: see <span class="t-lc"><a href="manip/boolalpha.html" title="cpp/io/manip/boolalpha">std::boolalpha</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1152</td></tr> 1153 1154 1155<tr class="t-dsc"> 1156<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>showbase</tt></a> 1157</td> 1158<td> generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see <span class="t-lc"><a href="manip/showbase.html" title="cpp/io/manip/showbase">std::showbase</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1159</td></tr> 1160 1161 1162<tr class="t-dsc"> 1163<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>showpoint</tt></a> 1164</td> 1165<td> generate a decimal-point character unconditionally for floating-point number output: see <span class="t-lc"><a href="manip/showpoint.html" title="cpp/io/manip/showpoint">std::showpoint</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1166</td></tr> 1167 1168 1169<tr class="t-dsc"> 1170<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>showpos</tt></a> 1171</td> 1172<td> generate a <span class="mw-geshi cpp source-cpp"><span class="sy2">+</span></span> character for non-negative numeric output: see <span class="t-lc"><a href="manip/showpos.html" title="cpp/io/manip/showpos">std::showpos</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1173</td></tr> 1174 1175 1176<tr class="t-dsc"> 1177<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>skipws</tt></a> 1178</td> 1179<td> skip leading whitespace before certain input operations: see <span class="t-lc"><a href="manip/skipws.html" title="cpp/io/manip/skipws">std::skipws</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1180</td></tr> 1181 1182 1183<tr class="t-dsc"> 1184<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>unitbuf</tt></a> 1185</td> 1186<td> flush the output after each output operation: see <span class="t-lc"><a href="manip/unitbuf.html" title="cpp/io/manip/unitbuf">std::unitbuf</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1187</td></tr> 1188 1189 1190<tr class="t-dsc"> 1191<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>uppercase</tt></a> 1192</td> 1193<td> replace certain lowercase letters with their uppercase<br />equivalents in certain output operations: see <span class="t-lc"><a href="manip/uppercase.html" title="cpp/io/manip/uppercase">std::uppercase</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1194</td></tr> 1195 1196</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&amp;action=edit">&#91;edit&#93;</a></span> 1197</td></tr> 1198 1199<tr class="t-dsc"> 1200<td> <div class="t-dsc-member-div"><div><a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"> <span class="t-lines"><span>iostate</span></span></a></div></div> 1201</td> 1202<td> state of the stream type 1203<p>The following constants are also defined: 1204</p> 1205<table class="t-dsc-begin"> 1206 1207<tr class="t-dsc-hitem"> 1208<td> Constant 1209</td> 1210<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&amp;action=edit">&#91;edit&#93;</a></span> 1211</td></tr> 1212 1213 1214<tr class="t-dsc"> 1215<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>goodbit</tt></a> 1216</td> 1217<td> no error<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&amp;action=edit">&#91;edit&#93;</a></span> 1218</td></tr> 1219 1220 1221<tr class="t-dsc"> 1222<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>badbit</tt></a> 1223</td> 1224<td> irrecoverable stream error<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&amp;action=edit">&#91;edit&#93;</a></span> 1225</td></tr> 1226 1227 1228<tr class="t-dsc"> 1229<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>failbit</tt></a> 1230</td> 1231<td> input/output operation failed (formatting or extraction error)<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&amp;action=edit">&#91;edit&#93;</a></span> 1232</td></tr> 1233 1234 1235<tr class="t-dsc"> 1236<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>eofbit</tt></a> 1237</td> 1238<td> associated input sequence has reached end-of-file<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&amp;action=edit">&#91;edit&#93;</a></span> 1239</td></tr> 1240 1241</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&amp;action=edit">&#91;edit&#93;</a></span> 1242</td></tr> 1243 1244<tr class="t-dsc"> 1245<td> <div class="t-dsc-member-div"><div><a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"> <span class="t-lines"><span>seekdir</span></span></a></div></div> 1246</td> 1247<td> seeking direction type 1248<p>The following constants are also defined: 1249</p> 1250<table class="t-dsc-begin"> 1251 1252<tr class="t-dsc-hitem"> 1253<td> Constant 1254</td> 1255<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&amp;action=edit">&#91;edit&#93;</a></span> 1256</td></tr> 1257 1258 1259<tr class="t-dsc"> 1260<td> <a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"><tt>beg</tt></a> 1261</td> 1262<td> the beginning of a stream <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&amp;action=edit">&#91;edit&#93;</a></span> 1263</td></tr> 1264 1265 1266<tr class="t-dsc"> 1267<td> <a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"><tt>end</tt></a> 1268</td> 1269<td> the ending of a stream <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&amp;action=edit">&#91;edit&#93;</a></span> 1270</td></tr> 1271 1272 1273<tr class="t-dsc"> 1274<td> <a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"><tt>cur</tt></a> 1275</td> 1276<td> the current position of stream position indicator <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&amp;action=edit">&#91;edit&#93;</a></span> 1277</td></tr> 1278 1279</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&amp;action=edit">&#91;edit&#93;</a></span> 1280</td></tr> 1281 1282<tr class="t-dsc"> 1283<td> <div class="t-dsc-member-div"><div><a href="ios_base/event.html" title="cpp/io/ios base/event"> <span class="t-lines"><span>event</span></span></a></div></div> 1284</td> 1285<td> specifies event type <br /> <span class="t-mark">(enum)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_event&amp;action=edit">&#91;edit&#93;</a></span> 1286</td></tr> 1287 1288<tr class="t-dsc"> 1289<td> <div class="t-dsc-member-div"><div><a href="ios_base/event_callback.html" title="cpp/io/ios base/event callback"> <span class="t-lines"><span>event_callback</span></span></a></div></div> 1290</td> 1291<td> callback function type <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_event_callback&amp;action=edit">&#91;edit&#93;</a></span> 1292</td></tr> 1293</table> 1294</div> 1295<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&amp;action=edit&amp;section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3> 1296<table class="wikitable ftm-begin ftm-has-value"> 1297 1298<tr> 1299<th><a href="../utility/feature_test.html" title="cpp/utility/feature test">Feature-test</a> macro</th> 1300<th>Value</th> 1301<th><span title="Standard in which the feature is introduced">Std</span></th> 1302<th>Feature 1303</th></tr> 1304<tr> 1305<td><a href="../feature_test.html#cpp_lib_fstream_native_handle" title="cpp/feature test"><code>__cpp_lib_fstream_native_handle</code></a></td> 1306<td><span class="mw-geshi cpp source-cpp"><span class="nu0">202306L</span></span></td> 1307<td><span class="t-mark">(C++26)</span></td> 1308<td>native handles support 1309</td></tr></table> 1310<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&amp;action=edit&amp;section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3> 1311<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div> 1312<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> 1313<span class="co2">#include &lt;iostream&gt;</span> 1314<span class="co2">#include &lt;string&gt;</span> 1315&#160; 1316<span class="kw4">int</span> main<span class="br0">&#40;</span><span class="br0">&#41;</span> 1317<span class="br0">&#123;</span> 1318 <a href="../string/basic_string.html"><span class="kw1233">std::<span class="me2">string</span></span></a> filename <span class="sy1">=</span> <span class="st0">&quot;Test.b&quot;</span><span class="sy4">;</span> 1319&#160; 1320 <span class="co1">// prepare a file to read</span> 1321 <span class="kw4">double</span> d <span class="sy1">=</span> <span class="nu16">3.14</span><span class="sy4">;</span> 1322 <a href="basic_ofstream.html"><span class="kw1735">std::<span class="me2">ofstream</span></span></a><span class="br0">&#40;</span>filename, std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">binary</span><span class="br0">&#41;</span> 1323 .<span class="me1">write</span><span class="br0">&#40;</span><span class="kw1">reinterpret_cast</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">&#40;</span><span class="sy3">&amp;</span>d<span class="br0">&#41;</span>, sizeof d<span class="br0">&#41;</span> <span class="sy1">&lt;&lt;</span> <span class="nu0">123</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;abc&quot;</span><span class="sy4">;</span> 1324&#160; 1325 <span class="co1">// open file for reading</span> 1326 std<span class="sy4">::</span><span class="me2">ifstream</span> istrm<span class="br0">&#40;</span>filename, std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">binary</span><span class="br0">&#41;</span><span class="sy4">;</span> 1327 <span class="kw1">if</span> <span class="br0">&#40;</span><span class="sy3">!</span>istrm.<span class="me1">is_open</span><span class="br0">&#40;</span><span class="br0">&#41;</span><span class="br0">&#41;</span> 1328 <a href="cout.html"><span class="kw1759">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;failed to open &quot;</span> <span class="sy1">&lt;&lt;</span> filename <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span> 1329 <span class="kw1">else</span> 1330 <span class="br0">&#123;</span> 1331 <span class="kw4">double</span> d<span class="sy4">;</span> 1332 istrm.<span class="me1">read</span><span class="br0">&#40;</span><span class="kw1">reinterpret_cast</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">&#40;</span><span class="sy3">&amp;</span>d<span class="br0">&#41;</span>, sizeof d<span class="br0">&#41;</span><span class="sy4">;</span> <span class="co1">// binary input</span> 1333 <span class="kw4">int</span> n<span class="sy4">;</span> 1334 <a href="../string/basic_string.html"><span class="kw1233">std::<span class="me2">string</span></span></a> s<span class="sy4">;</span> 1335 <span class="kw1">if</span> <span class="br0">&#40;</span>istrm <span class="sy1">&gt;&gt;</span> n <span class="sy1">&gt;&gt;</span> s<span class="br0">&#41;</span> <span class="co1">// text input</span> 1336 <a href="cout.html"><span class="kw1759">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;read back from file: &quot;</span> <span class="sy1">&lt;&lt;</span> d <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span> <span class="sy1">&lt;&lt;</span> n <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span> <span class="sy1">&lt;&lt;</span> s <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span> 1337 <span class="br0">&#125;</span> 1338<span class="br0">&#125;</span></pre></div></div> 1339<p>Output: 1340</p> 1341<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">read back from file: 3.14 123 abc</pre></div></div> 1342</div> 1343 1344<!-- 1345NewPP limit report 1346Preprocessor visited node count: 17503/1000000 1347Preprocessor generated node count: 16854/1000000 1348Post‐expand include size: 636886/2097152 bytes 1349Template argument size: 178179/2097152 bytes 1350Highest expansion depth: 35/40 1351Expensive parser function count: 0/100 1352--> 1353 1354<!-- Saved in parser cache with key mwiki1-mwiki_en_:pcache:idhash:494-0!*!0!!en!2!* and timestamp 20231109085046 --> 1355</div> <!-- /bodycontent --> 1356 <!-- printfooter --> 1357 <div class="printfooter"> 1358 Retrieved from "<a 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