Provided by: libstdc++-9-doc_9.5.0-3ubuntu1_all 
NAME
std::basic_ofstream< _CharT, _Traits > - Controlling output for files.
SYNOPSIS
Inherits std::basic_ostream< _CharT, _Traits >.
Public Types
typedef ctype< _CharT > __ctype_type
typedef basic_filebuf< char_type, traits_type > __filebuf_type
typedef basic_ios< _CharT, _Traits > __ios_type
typedef num_put< _CharT, ostreambuf_iterator< _CharT, _Traits > > __num_put_type
typedef basic_ostream< char_type, traits_type > __ostream_type
typedef basic_streambuf< _CharT, _Traits > __streambuf_type
typedef int io_state _GLIBCXX_DEPRECATED_SUGGEST('std::iostate')
typedef int open_mode _GLIBCXX_DEPRECATED_SUGGEST('std::openmode')
typedef int seek_dir _GLIBCXX_DEPRECATED_SUGGEST('std::seekdir')
typedef std::streamoff streamoff _GLIBCXX_DEPRECATED_SUGGEST('std::streamoff')
typedef std::streampos streampos _GLIBCXX_DEPRECATED_SUGGEST('std::streampos')
typedef _CharT char_type
enum event { erase_event, imbue_event, copyfmt_event }
The set of events that may be passed to an event callback.
typedef void(* event_callback) (event __e, ios_base &__b, int __i)
The type of an event callback function.
typedef _Ios_Fmtflags fmtflags
This is a bitmask type.
typedef traits_type::int_type int_type
typedef _Ios_Iostate iostate
This is a bitmask type.
typedef traits_type::off_type off_type
typedef _Ios_Openmode openmode
This is a bitmask type.
typedef traits_type::pos_type pos_type
typedef _Ios_Seekdir seekdir
This is an enumerated type.
typedef _Traits traits_type
typedef num_get< _CharT, istreambuf_iterator< _CharT, _Traits > > __num_get_type
Public Member Functions
basic_ofstream ()
Default constructor.
basic_ofstream (basic_ofstream &&__rhs)
basic_ofstream (const basic_ofstream &)=delete
basic_ofstream (const char *__s, ios_base::openmode __mode=ios_base::out)
Create an output file stream.
basic_ofstream (const std::string &__s, ios_base::openmode __mode=ios_base::out)
Create an output file stream.
~basic_ofstream ()
The destructor does nothing.
const locale & _M_getloc () const
Locale access.
template<typename _ValueT > basic_ostream< _CharT, _Traits > & _M_insert (_ValueT __v)
void _M_setstate (iostate __state)
bool bad () const
Fast error checking.
void clear (iostate __state=goodbit)
[Re]sets the error state.
void close ()
Close the file.
basic_ios & copyfmt (const basic_ios &__rhs)
Copies fields of __rhs into this.
bool eof () const
Fast error checking.
iostate exceptions () const
Throwing exceptions on errors.
void exceptions (iostate __except)
Throwing exceptions on errors.
bool fail () const
Fast error checking.
char_type fill () const
Retrieves the empty character.
char_type fill (char_type __ch)
Sets a new empty character.
fmtflags flags () const
Access to format flags.
fmtflags flags (fmtflags __fmtfl)
Setting new format flags all at once.
__ostream_type & flush ()
Synchronizing the stream buffer.
locale getloc () const
Locale access.
bool good () const
Fast error checking.
locale imbue (const locale &__loc)
Moves to a new locale.
bool is_open ()
Wrapper to test for an open file.
bool is_open () const
long & iword (int __ix)
Access to integer array.
char narrow (char_type __c, char __dfault) const
Squeezes characters.
void open (const char *__s, ios_base::openmode __mode=ios_base::out)
Opens an external file.
void open (const std::string &__s, ios_base::openmode __mode=ios_base::out)
Opens an external file.
__ostream_type & operator<< (__streambuf_type *__sb)
Extracting from another streambuf.
__ostream_type & operator<< (const void *__p)
Pointer arithmetic inserters.
basic_ofstream & operator= (basic_ofstream &&__rhs)
basic_ofstream & operator= (const basic_ofstream &)=delete
streamsize precision () const
Flags access.
streamsize precision (streamsize __prec)
Changing flags.
void *& pword (int __ix)
Access to void pointer array.
__filebuf_type * rdbuf () const
Accessing the underlying buffer.
basic_streambuf< _CharT, _Traits > * rdbuf (basic_streambuf< _CharT, _Traits > *__sb)
Changing the underlying buffer.
iostate rdstate () const
Returns the error state of the stream buffer.
void register_callback (event_callback __fn, int __index)
Add the callback __fn with parameter __index.
__ostream_type & seekp (off_type, ios_base::seekdir)
Changing the current write position.
__ostream_type & seekp (pos_type)
Changing the current write position.
fmtflags setf (fmtflags __fmtfl)
Setting new format flags.
fmtflags setf (fmtflags __fmtfl, fmtflags __mask)
Setting new format flags.
void setstate (iostate __state)
Sets additional flags in the error state.
void swap (basic_ofstream &__rhs)
pos_type tellp ()
Getting the current write position.
basic_ostream< _CharT, _Traits > * tie () const
Fetches the current tied stream.
basic_ostream< _CharT, _Traits > * tie (basic_ostream< _CharT, _Traits > *__tiestr)
Ties this stream to an output stream.
void unsetf (fmtflags __mask)
Clearing format flags.
char_type widen (char __c) const
Widens characters.
streamsize width () const
Flags access.
streamsize width (streamsize __wide)
Changing flags.
__ostream_type & operator<< (__ostream_type &(*__pf)(__ostream_type &))
Interface for manipulators.
__ostream_type & operator<< (__ios_type &(*__pf)(__ios_type &))
Interface for manipulators.
__ostream_type & operator<< (ios_base &(*__pf)(ios_base &))
Interface for manipulators.
Inserters
All the operator<< functions (aka formatted output functions) have some common behavior.
Each starts by constructing a temporary object of type std::basic_ostream::sentry. This
can have several effects, concluding with the setting of a status flag; see the sentry
documentation for more.
If the sentry status is good, the function tries to generate whatever data is appropriate
for the type of the argument.
If an exception is thrown during insertion, ios_base::badbit will be turned on in the
stream's error state without causing an ios_base::failure to be thrown. The original
exception will then be rethrown.
__ostream_type & operator<< (long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (bool __n)
Integer arithmetic inserters.
__ostream_type & operator<< (short __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned short __n)
Integer arithmetic inserters.
__ostream_type & operator<< (int __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned int __n)
Integer arithmetic inserters.
__ostream_type & operator<< (long long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned long long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (double __f)
Floating point arithmetic inserters.
__ostream_type & operator<< (float __f)
Floating point arithmetic inserters.
__ostream_type & operator<< (long double __f)
Floating point arithmetic inserters.
Unformatted Output Functions
All the unformatted output functions have some common behavior. Each starts by
constructing a temporary object of type std::basic_ostream::sentry. This has several
effects, concluding with the setting of a status flag; see the sentry documentation for
more.
If the sentry status is good, the function tries to generate whatever data is appropriate
for the type of the argument.
If an exception is thrown during insertion, ios_base::badbit will be turned on in the
stream's error state. If badbit is on in the stream's exceptions mask, the exception will
be rethrown without completing its actions.
__ostream_type & put (char_type __c)
Simple insertion.
void _M_write (const char_type *__s, streamsize __n)
Core write functionality, without sentry.
__ostream_type & write (const char_type *__s, streamsize __n)
Character string insertion.
operator bool () const
The quick-and-easy status check.
bool operator! () const
The quick-and-easy status check.
Static Public Member Functions
static bool sync_with_stdio (bool __sync=true)
Interaction with the standard C I/O objects.
static int xalloc () throw ()
Access to unique indices.
Static Public Attributes
static const fmtflags adjustfield
A mask of left|right|internal. Useful for the 2-arg form of setf.
static const openmode app
Seek to end before each write.
static const openmode ate
Open and seek to end immediately after opening.
static const iostate badbit
Indicates a loss of integrity in an input or output sequence (such as an irrecoverable
read error from a file).
static const fmtflags basefield
A mask of dec|oct|hex. Useful for the 2-arg form of setf.
static const seekdir beg
Request a seek relative to the beginning of the stream.
static const openmode binary
Perform input and output in binary mode (as opposed to text mode). This is probably
not what you think it is; see
https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary.
static const fmtflags boolalpha
Insert/extract bool in alphabetic rather than numeric format.
static const seekdir cur
Request a seek relative to the current position within the sequence.
static const fmtflags dec
Converts integer input or generates integer output in decimal base.
static const seekdir end
Request a seek relative to the current end of the sequence.
static const iostate eofbit
Indicates that an input operation reached the end of an input sequence.
static const iostate failbit
Indicates that an input operation failed to read the expected characters, or that an
output operation failed to generate the desired characters.
static const fmtflags fixed
Generate floating-point output in fixed-point notation.
static const fmtflags floatfield
A mask of scientific|fixed. Useful for the 2-arg form of setf.
static const iostate goodbit
Indicates all is well.
static const fmtflags hex
Converts integer input or generates integer output in hexadecimal base.
static const openmode in
Open for input. Default for ifstream and fstream.
static const fmtflags internal
Adds fill characters at a designated internal point in certain generated output, or
identical to right if no such point is designated.
static const fmtflags left
Adds fill characters on the right (final positions) of certain generated output.
(I.e., the thing you print is flush left.)
static const fmtflags oct
Converts integer input or generates integer output in octal base.
static const openmode out
Open for output. Default for ofstream and fstream.
static const fmtflags right
Adds fill characters on the left (initial positions) of certain generated output.
(I.e., the thing you print is flush right.)
static const fmtflags scientific
Generates floating-point output in scientific notation.
static const fmtflags showbase
Generates a prefix indicating the numeric base of generated integer output.
static const fmtflags showpoint
Generates a decimal-point character unconditionally in generated floating-point
output.
static const fmtflags showpos
Generates a + sign in non-negative generated numeric output.
static const fmtflags skipws
Skips leading white space before certain input operations.
static const openmode trunc
Truncate an existing stream when opening. Default for ofstream.
static const fmtflags unitbuf
Flushes output after each output operation.
static const fmtflags uppercase
Replaces certain lowercase letters with their uppercase equivalents in generated
output.
Protected Types
enum { _S_local_word_size }
Protected Member Functions
void _M_cache_locale (const locale &__loc)
void _M_call_callbacks (event __ev) throw ()
void _M_dispose_callbacks (void) throw ()
_Words & _M_grow_words (int __index, bool __iword)
void _M_init () throw ()
template<typename _ValueT > __ostream_type & _M_insert (_ValueT __v)
void _M_move (ios_base &) noexcept
void _M_swap (ios_base &__rhs) noexcept
void init (basic_streambuf< _CharT, _Traits > *__sb)
All setup is performed here.
void move (basic_ios &&__rhs)
void move (basic_ios &__rhs)
void set_rdbuf (basic_streambuf< _CharT, _Traits > *__sb)
void swap (basic_ios &__rhs) noexcept
void swap (basic_ostream &__rhs)
Protected Attributes
_Callback_list * _M_callbacks
const __ctype_type * _M_ctype
iostate _M_exception
char_type _M_fill
bool _M_fill_init
fmtflags _M_flags
locale _M_ios_locale
_Words _M_local_word [_S_local_word_size]
const __num_get_type * _M_num_get
const __num_put_type * _M_num_put
streamsize _M_precision
basic_streambuf< _CharT, _Traits > * _M_streambuf
iostate _M_streambuf_state
basic_ostream< _CharT, _Traits > * _M_tie
streamsize _M_width
_Words * _M_word
int _M_word_size
_Words _M_word_zero
Detailed Description
template<typename _CharT, typename _Traits>
class std::basic_ofstream< _CharT, _Traits >"Controlling output for files.
Template Parameters
_CharT Type of character stream.
_Traits Traits for character type, defaults to char_traits<_CharT>.
This class supports reading from named files, using the inherited functions from
std::basic_ostream. To control the associated sequence, an instance of std::basic_filebuf
is used, which this page refers to as sb.
Definition at line 753 of file fstream.
Member Typedef Documentation
template<typename _CharT , typename _Traits > typedef ctype<_CharT> std::basic_ostream<
_CharT, _Traits >::__ctype_type [inherited]
Definition at line 74 of file ostream.
template<typename _CharT , typename _Traits > typedef basic_filebuf<char_type, traits_type>
std::basic_ofstream< _CharT, _Traits >::__filebuf_type
Definition at line 764 of file fstream.
template<typename _CharT , typename _Traits > typedef basic_ios<_CharT, _Traits>
std::basic_ostream< _CharT, _Traits >::__ios_type [inherited]
Definition at line 70 of file ostream.
template<typename _CharT , typename _Traits > typedef num_get<_CharT,
istreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_get_type
[inherited]
These are non-standard types.
Definition at line 91 of file basic_ios.h.
template<typename _CharT , typename _Traits > typedef num_put<_CharT,
ostreambuf_iterator<_CharT, _Traits> > std::basic_ostream< _CharT, _Traits
>::__num_put_type [inherited]
Definition at line 73 of file ostream.
template<typename _CharT , typename _Traits > typedef basic_ostream<char_type, traits_type>
std::basic_ofstream< _CharT, _Traits >::__ostream_type
Definition at line 765 of file fstream.
template<typename _CharT , typename _Traits > typedef basic_streambuf<_CharT, _Traits>
std::basic_ostream< _CharT, _Traits >::__streambuf_type [inherited]
Definition at line 69 of file ostream.
typedef int io_state std::ios_base::_GLIBCXX_DEPRECATED_SUGGEST('std::iostate') [inherited]
Definition at line 475 of file ios_base.h.
typedef int open_mode std::ios_base::_GLIBCXX_DEPRECATED_SUGGEST('std::openmode') [inherited]
Definition at line 477 of file ios_base.h.
typedef int seek_dir std::ios_base::_GLIBCXX_DEPRECATED_SUGGEST('std::seekdir') [inherited]
Definition at line 479 of file ios_base.h.
typedef std::streamoff streamoff std::ios_base::_GLIBCXX_DEPRECATED_SUGGEST('std::streamoff')
[inherited]
Definition at line 484 of file ios_base.h.
typedef std::streampos streampos std::ios_base::_GLIBCXX_DEPRECATED_SUGGEST('std::streampos')
[inherited]
Definition at line 482 of file ios_base.h.
template<typename _CharT , typename _Traits > typedef _CharT std::basic_ofstream< _CharT,
_Traits >::char_type
Definition at line 757 of file fstream.
typedef void(* std::ios_base::event_callback) (event __e, ios_base &__b, int __i) [inherited]
The type of an event callback function.
Parameters
__e One of the members of the event enum.
__b Reference to the ios_base object.
__i The integer provided when the callback was registered.
Event callbacks are user defined functions that get called during several ios_base and
basic_ios functions, specifically imbue(), copyfmt(), and ~ios().
Definition at line 511 of file ios_base.h.
typedef _Ios_Fmtflags std::ios_base::fmtflags [inherited]
This is a bitmask type. _Ios_Fmtflags is implementation-defined, but it is valid to
perform bitwise operations on these values and expect the Right Thing to happen. Defined
objects of type fmtflags are:
• boolalpha
• dec
• fixed
• hex
• internal
• left
• oct
• right
• scientific
• showbase
• showpoint
• showpos
• skipws
• unitbuf
• uppercase
• adjustfield
• basefield
• floatfield
Definition at line 323 of file ios_base.h.
template<typename _CharT , typename _Traits > typedef traits_type::int_type
std::basic_ofstream< _CharT, _Traits >::int_type
Definition at line 759 of file fstream.
typedef _Ios_Iostate std::ios_base::iostate [inherited]
This is a bitmask type. _Ios_Iostate is implementation-defined, but it is valid to perform
bitwise operations on these values and expect the Right Thing to happen. Defined objects
of type iostate are:
• badbit
• eofbit
• failbit
• goodbit
Definition at line 398 of file ios_base.h.
template<typename _CharT , typename _Traits > typedef traits_type::off_type
std::basic_ofstream< _CharT, _Traits >::off_type
Definition at line 761 of file fstream.
typedef _Ios_Openmode std::ios_base::openmode [inherited]
This is a bitmask type. _Ios_Openmode is implementation-defined, but it is valid to
perform bitwise operations on these values and expect the Right Thing to happen. Defined
objects of type openmode are:
• app
• ate
• binary
• in
• out
• trunc
Definition at line 429 of file ios_base.h.
template<typename _CharT , typename _Traits > typedef traits_type::pos_type
std::basic_ofstream< _CharT, _Traits >::pos_type
Definition at line 760 of file fstream.
typedef _Ios_Seekdir std::ios_base::seekdir [inherited]
This is an enumerated type. _Ios_Seekdir is implementation-defined. Defined values of type
seekdir are:
• beg
• cur, equivalent to SEEK_CUR in the C standard library.
• end, equivalent to SEEK_END in the C standard library.
Definition at line 461 of file ios_base.h.
template<typename _CharT , typename _Traits > typedef _Traits std::basic_ofstream< _CharT,
_Traits >::traits_type
Definition at line 758 of file fstream.
Member Enumeration Documentation
anonymous enum [protected], [inherited]
Definition at line 586 of file ios_base.h.
enum std::ios_base::event [inherited]
The set of events that may be passed to an event callback. erase_event is used during
~ios() and copyfmt(). imbue_event is used during imbue(). copyfmt_event is used during
copyfmt().
Definition at line 494 of file ios_base.h.
Constructor & Destructor Documentation
template<typename _CharT , typename _Traits > std::basic_ofstream< _CharT, _Traits
>::basic_ofstream () [inline]
Default constructor. Initializes sb using its default constructor, and passes &sb to the
base class initializer. Does not open any files (you haven't given it a filename to open).
Definition at line 779 of file fstream.
template<typename _CharT , typename _Traits > std::basic_ofstream< _CharT, _Traits
>::basic_ofstream (const char * __s, ios_base::openmode __mode = ios_base::out) [inline],
[explicit]
Create an output file stream.
Parameters
__s Null terminated string specifying the filename.
__mode Open file in specified mode (see std::ios_base).
ios_base::out is automatically included in __mode.
Definition at line 790 of file fstream.
template<typename _CharT , typename _Traits > std::basic_ofstream< _CharT, _Traits
>::basic_ofstream (const std::string & __s, ios_base::openmode __mode = ios_base::out)
[inline], [explicit]
Create an output file stream.
Parameters
__s std::string specifying the filename.
__mode Open file in specified mode (see std::ios_base).
ios_base::out is automatically included in __mode.
Definition at line 825 of file fstream.
template<typename _CharT , typename _Traits > std::basic_ofstream< _CharT, _Traits
>::basic_ofstream (basic_ofstream< _CharT, _Traits > && __rhs) [inline]
Definition at line 850 of file fstream.
template<typename _CharT , typename _Traits > std::basic_ofstream< _CharT, _Traits
>::~basic_ofstream () [inline]
The destructor does nothing. The file is closed by the filebuf object, not the formatting
stream.
Definition at line 862 of file fstream.
Member Function Documentation
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits
>::_M_cache_locale (const locale & __loc) [protected], [inherited]
Definition at line 157 of file basic_ios.tcc.
const locale & std::ios_base::_M_getloc () const [inline], [inherited]
Locale access.
Returns
A reference to the current locale.
Like getloc above, but returns a reference instead of generating a copy.
Definition at line 786 of file ios_base.h.
Referenced by std::money_get< _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter
>::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter
>::do_get_date(), std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get<
_CharT, _InIter >::do_get_time(), std::time_get< _CharT, _InIter >::do_get_weekday(),
std::num_put< _CharT, _OutIter >::do_put(), std::time_put< _CharT, _OutIter >::do_put(),
std::time_get< _CharT, _InIter >::get(), and std::time_put< _CharT, _OutIter >::put().
template<typename _CharT , typename _Traits > template<typename _ValueT > basic_ostream<
_CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::_M_insert (_ValueT __v)
[inherited]
Definition at line 63 of file ostream.tcc.
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits
>::_M_setstate (iostate __state) [inline], [inherited]
Definition at line 164 of file basic_ios.h.
template<typename _CharT , typename _Traits > void std::basic_ostream< _CharT, _Traits
>::_M_write (const char_type * __s, streamsize __n) [inline], [inherited]
Core write functionality, without sentry.
Parameters
__s The array to insert.
__n Maximum number of characters to insert.
Definition at line 317 of file ostream.
template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits >::bad ()
const [inline], [inherited]
Fast error checking.
Returns
True if the badbit is set.
Note that other iostate flags may also be set.
Definition at line 211 of file basic_ios.h.
References std::ios_base::badbit, and std::basic_ios< _CharT, _Traits >::rdstate().
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::clear
(iostate __state = goodbit) [inherited]
[Re]sets the error state.
Parameters
__state The new state flag(s) to set.
See std::ios_base::iostate for the possible bit values. Most users will not need to pass
an argument.
Definition at line 41 of file basic_ios.tcc.
Referenced by std::basic_ios< _CharT, _Traits >::exceptions(),
std::__detail::operator>>(), std::basic_istream< _CharT, _Traits >::seekg(),
std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_istream< _CharT, _Traits
>::unget().
template<typename _CharT , typename _Traits > void std::basic_ofstream< _CharT, _Traits
>::close () [inline]
Close the file. Calls std::basic_filebuf::close(). If that function fails, failbit is set
in the stream's error state.
Definition at line 993 of file fstream.
template<typename _CharT , typename _Traits > basic_ios< _CharT, _Traits > & std::basic_ios<
_CharT, _Traits >::copyfmt (const basic_ios< _CharT, _Traits > & __rhs) [inherited]
Copies fields of __rhs into this.
Parameters
__rhs The source values for the copies.
Returns
Reference to this object.
All fields of __rhs are copied into this object except that rdbuf() and rdstate() remain
unchanged. All values in the pword and iword arrays are copied. Before copying, each
callback is invoked with erase_event. After copying, each (new) callback is invoked with
copyfmt_event. The final step is to copy exceptions().
Definition at line 63 of file basic_ios.tcc.
References std::basic_ios< _CharT, _Traits >::exceptions(), std::basic_ios< _CharT,
_Traits >::fill(), std::ios_base::flags(), std::ios_base::getloc(),
std::ios_base::precision(), std::basic_ios< _CharT, _Traits >::tie(), std::tie(), and
std::ios_base::width().
template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits >::eof ()
const [inline], [inherited]
Fast error checking.
Returns
True if the eofbit is set.
Note that other iostate flags may also be set.
Definition at line 190 of file basic_ios.h.
References std::ios_base::eofbit, and std::basic_ios< _CharT, _Traits >::rdstate().
template<typename _CharT , typename _Traits > iostate std::basic_ios< _CharT, _Traits
>::exceptions () const [inline], [inherited]
Throwing exceptions on errors.
Returns
The current exceptions mask.
This changes nothing in the stream. See the one-argument version of exceptions(iostate)
for the meaning of the return value.
Definition at line 222 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt().
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits
>::exceptions (iostate __except) [inline], [inherited]
Throwing exceptions on errors.
Parameters
__except The new exceptions mask.
By default, error flags are set silently. You can set an exceptions mask for each stream;
if a bit in the mask becomes set in the error flags, then an exception of type
std::ios_base::failure is thrown.
If the error flag is already set when the exceptions mask is added, the exception is
immediately thrown. Try running the following under GCC 3.1 or later:
#include <iostream>
#include <fstream>
#include <exception>
int main()
{
std::set_terminate (__gnu_cxx::__verbose_terminate_handler);
std::ifstream f ("/etc/motd");
std::cerr << "Setting badbit0;
f.setstate (std::ios_base::badbit);
std::cerr << "Setting exception mask0;
f.exceptions (std::ios_base::badbit);
}
Definition at line 257 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::clear().
template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits >::fail ()
const [inline], [inherited]
Fast error checking.
Returns
True if either the badbit or the failbit is set.
Checking the badbit in fail() is historical practice. Note that other iostate flags may
also be set.
Definition at line 201 of file basic_ios.h.
References std::ios_base::badbit, std::ios_base::failbit, and std::basic_ios< _CharT,
_Traits >::rdstate().
Referenced by std::basic_ios< _CharT, _Traits >::operator bool(), and std::basic_ios<
_CharT, _Traits >::operator!().
template<typename _CharT , typename _Traits > char_type std::basic_ios< _CharT, _Traits
>::fill () const [inline], [inherited]
Retrieves the empty character.
Returns
The current fill character.
It defaults to a space (' ') in the current locale.
Definition at line 370 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::widen().
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::basic_ios< _CharT,
_Traits >::fill(), and std::gamma_distribution< result_type >::operator()().
template<typename _CharT , typename _Traits > char_type std::basic_ios< _CharT, _Traits
>::fill (char_type __ch) [inline], [inherited]
Sets a new empty character.
Parameters
__ch The new character.
Returns
The previous fill character.
The fill character is used to fill out space when P+ characters have been requested (e.g.,
via setw), Q characters are actually used, and Q<P. It defaults to a space (' ') in the
current locale.
Definition at line 390 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::fill().
fmtflags std::ios_base::flags () const [inline], [inherited]
Access to format flags.
Returns
The format control flags for both input and output.
Definition at line 631 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::num_get< _CharT, _InIter
>::do_get(), std::num_put< _CharT, _OutIter >::do_put(), std::gamma_distribution<
result_type >::operator()(), std::operator<<(), std::operator>>(), and
std::__detail::operator>>().
fmtflags std::ios_base::flags (fmtflags __fmtfl) [inline], [inherited]
Setting new format flags all at once.
Parameters
__fmtfl The new flags to set.
Returns
The previous format control flags.
This function overwrites all the format flags with __fmtfl.
Definition at line 642 of file ios_base.h.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::flush [inherited]
Synchronizing the stream buffer.
Returns
*this
If rdbuf() is a null pointer, changes nothing.
Otherwise, calls rdbuf()->pubsync(), and if that returns -1, sets badbit.
Definition at line 210 of file ostream.tcc.
References std::ios_base::goodbit.
locale std::ios_base::getloc () const [inline], [inherited]
Locale access.
Returns
A copy of the current locale.
If imbue(loc) has previously been called, then this function returns loc. Otherwise, it
returns a copy of std::locale(), the global C++ locale.
Definition at line 775 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::money_put< _CharT,
_OutIter >::do_put(), and std::ws().
template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits >::good ()
const [inline], [inherited]
Fast error checking.
Returns
True if no error flags are set.
A wrapper around rdstate.
Definition at line 180 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::rdstate().
Referenced by std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::basic_ostream<
_CharT, _Traits >::sentry::sentry(), and std::__detail::operator>>().
template<typename _CharT , typename _Traits > locale std::basic_ios< _CharT, _Traits >::imbue
(const locale & __loc) [inherited]
Moves to a new locale.
Parameters
__loc The new locale.
Returns
The previous locale.
Calls ios_base::imbue(loc), and if a stream buffer is associated with this stream, calls
that buffer's pubimbue(loc).
Additional l10n notes are at
http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 114 of file basic_ios.tcc.
References std::ios_base::imbue().
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::init
(basic_streambuf< _CharT, _Traits > * __sb) [protected], [inherited]
All setup is performed here. This is called from the public constructor. It is not virtual
and cannot be redefined.
Definition at line 126 of file basic_ios.tcc.
Referenced by std::basic_ios< _CharT, _Traits >::basic_ios().
template<typename _CharT , typename _Traits > bool std::basic_ofstream< _CharT, _Traits
>::is_open () [inline]
Wrapper to test for an open file.
Returns
rdbuf()->is_open()
Definition at line 903 of file fstream.
template<typename _CharT , typename _Traits > bool std::basic_ofstream< _CharT, _Traits
>::is_open () const [inline]
Definition at line 909 of file fstream.
long & std::ios_base::iword (int __ix) [inline], [inherited]
Access to integer array.
Parameters
__ix Index into the array.
Returns
A reference to an integer associated with the index.
The iword function provides access to an array of integers that can be used for any
purpose. The array grows as required to hold the supplied index. All integers in the array
are initialized to 0.
The implementation reserves several indices. You should use xalloc to obtain an index that
is safe to use. Also note that since the array can grow dynamically, it is not safe to
hold onto the reference.
Definition at line 821 of file ios_base.h.
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::move
(basic_ios< _CharT, _Traits > && __rhs) [inline], [protected], [inherited]
Definition at line 490 of file basic_ios.h.
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::move
(basic_ios< _CharT, _Traits > & __rhs) [inline], [protected], [inherited]
Definition at line 479 of file basic_ios.h.
template<typename _CharT , typename _Traits > char std::basic_ios< _CharT, _Traits >::narrow
(char_type __c, char __dfault) const [inline], [inherited]
Squeezes characters.
Parameters
__c The character to narrow.
__dfault The character to narrow.
Returns
The narrowed character.
Maps a character of char_type to a character of char, if possible.
Returns the result of
std::use_facet<ctype<char_type> >(getloc()).narrow(c,dfault)
Additional l10n notes are at
http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 430 of file basic_ios.h.
template<typename _CharT , typename _Traits > void std::basic_ofstream< _CharT, _Traits
>::open (const char * __s, ios_base::openmode __mode = ios_base::out) [inline]
Opens an external file.
Parameters
__s The name of the file.
__mode The open mode flags.
Calls std::basic_filebuf::open(__s,__mode|out). If that function fails, failbit is set in
the stream's error state.
Definition at line 921 of file fstream.
template<typename _CharT , typename _Traits > void std::basic_ofstream< _CharT, _Traits
>::open (const std::string & __s, ios_base::openmode __mode = ios_base::out) [inline]
Opens an external file.
Parameters
__s The name of the file.
__mode The open mode flags.
Calls std::basic_filebuf::open(s,mode|out). If that function fails, failbit is set in the
stream's error state.
Definition at line 960 of file fstream.
template<typename _CharT , typename _Traits > std::basic_ios< _CharT, _Traits >::operator bool
() const [inline], [explicit], [inherited]
The quick-and-easy status check. This allows you to write constructs such as if
(!a_stream) ... and while (a_stream) ...
Definition at line 117 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::fail().
template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits
>::operator! () const [inline], [inherited]
The quick-and-easy status check. This allows you to write constructs such as if
(!a_stream) ... and while (a_stream) ...
Definition at line 125 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::fail().
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (__ios_type &(*)(__ios_type &) __pf) [inline], [inherited]
Interface for manipulators. Manipulators such as std::endl and std::hex use these
functions in constructs like 'std::cout << std::endl'. For more information, see the
iomanip header.
Definition at line 116 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (__ostream_type &(*)(__ostream_type &) __pf) [inline], [inherited]
Interface for manipulators. Manipulators such as std::endl and std::hex use these
functions in constructs like 'std::cout << std::endl'. For more information, see the
iomanip header.
Definition at line 107 of file ostream.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::operator<< (__streambuf_type * __sb) [inherited]
Extracting from another streambuf.
Parameters
__sb A pointer to a streambuf
This function behaves like one of the basic arithmetic extractors, in that it also
constructs a sentry object and has the same error handling behavior.
If __sb is NULL, the stream will set failbit in its error state.
Characters are extracted from __sb and inserted into *this until one of the following
occurs:
• the input stream reaches end-of-file,
• insertion into the output sequence fails (in this case, the character that would have
been inserted is not extracted), or
• an exception occurs while getting a character from __sb, which sets failbit in the error
state
If the function inserts no characters, failbit is set.
Definition at line 63 of file ostream.tcc.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (bool __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 173 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (const void * __p) [inline], [inherited]
Pointer arithmetic inserters.
Parameters
__p A variable of pointer type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 244 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (double __f) [inline], [inherited]
Floating point arithmetic inserters.
Parameters
__f A variable of builtin floating point type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 219 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (float __f) [inline], [inherited]
Floating point arithmetic inserters.
Parameters
__f A variable of builtin floating point type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 223 of file ostream.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::operator<< (int __n) [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 63 of file ostream.tcc.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (ios_base &(*)(ios_base &) __pf) [inline], [inherited]
Interface for manipulators. Manipulators such as std::endl and std::hex use these
functions in constructs like 'std::cout << std::endl'. For more information, see the
iomanip header.
Definition at line 126 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (long __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 165 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (long double __f) [inline], [inherited]
Floating point arithmetic inserters.
Parameters
__f A variable of builtin floating point type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 231 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (long long __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 200 of file ostream.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::operator<< (short __n) [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 63 of file ostream.tcc.
References std::ios_base::goodbit.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (unsigned int __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 191 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (unsigned long __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 169 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (unsigned long long __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 204 of file ostream.
template<typename _CharT , typename _Traits > __ostream_type & std::basic_ostream< _CharT,
_Traits >::operator<< (unsigned short __n) [inline], [inherited]
Integer arithmetic inserters.
Parameters
__n A variable of builtin integral type.
Returns
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to
perform numeric formatting.
Definition at line 180 of file ostream.
template<typename _CharT , typename _Traits > basic_ofstream & std::basic_ofstream< _CharT,
_Traits >::operator= (basic_ofstream< _CharT, _Traits > && __rhs) [inline]
Definition at line 872 of file fstream.
streamsize std::ios_base::precision () const [inline], [inherited]
Flags access.
Returns
The precision to generate on certain output operations.
Be careful if you try to give a definition of precision here; see DR 189.
Definition at line 701 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::gamma_distribution<
result_type >::operator()().
streamsize std::ios_base::precision (streamsize __prec) [inline], [inherited]
Changing flags.
Parameters
__prec The new precision value.
Returns
The previous value of precision().
Definition at line 710 of file ios_base.h.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::put (char_type __c) [inherited]
Simple insertion.
Parameters
__c The character to insert.
Returns
*this
Tries to insert __c.
Note
This function is not overloaded on signed char and unsigned char.
Definition at line 148 of file ostream.tcc.
References std::ios_base::goodbit.
void *& std::ios_base::pword (int __ix) [inline], [inherited]
Access to void pointer array.
Parameters
__ix Index into the array.
Returns
A reference to a void* associated with the index.
The pword function provides access to an array of pointers that can be used for any
purpose. The array grows as required to hold the supplied index. All pointers in the array
are initialized to 0.
The implementation reserves several indices. You should use xalloc to obtain an index that
is safe to use. Also note that since the array can grow dynamically, it is not safe to
hold onto the reference.
Definition at line 842 of file ios_base.h.
template<typename _CharT , typename _Traits > __filebuf_type * std::basic_ofstream< _CharT,
_Traits >::rdbuf () const [inline]
Accessing the underlying buffer.
Returns
The current basic_filebuf buffer.
This hides both signatures of std::basic_ios::rdbuf().
Definition at line 895 of file fstream.
template<typename _CharT , typename _Traits > basic_streambuf< _CharT, _Traits > *
std::basic_ios< _CharT, _Traits >::rdbuf (basic_streambuf< _CharT, _Traits > * __sb)
[inherited]
Changing the underlying buffer.
Parameters
__sb The new stream buffer.
Returns
The previous stream buffer.
Associates a new buffer with the current stream, and clears the error state.
Due to historical accidents which the LWG refuses to correct, the I/O library suffers from
a design error: this function is hidden in derived classes by overrides of the zero-
argument rdbuf(), which is non-virtual for hysterical raisins. As a result, you must use
explicit qualifications to access this function via any derived class. For example:
std::fstream foo; // or some other derived type
std::streambuf* p = .....;
foo.ios::rdbuf(p); // ios == basic_ios<char>
Definition at line 53 of file basic_ios.tcc.
template<typename _CharT , typename _Traits > iostate std::basic_ios< _CharT, _Traits
>::rdstate () const [inline], [inherited]
Returns the error state of the stream buffer.
Returns
A bit pattern (well, isn't everything?)
See std::ios_base::iostate for the possible bit values. Most users will call one of the
interpreting wrappers, e.g., good().
Definition at line 137 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::bad(), std::basic_ios< _CharT, _Traits
>::eof(), std::basic_ios< _CharT, _Traits >::fail(), std::basic_ios< _CharT, _Traits
>::good(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ios< _CharT, _Traits
>::setstate(), and std::basic_istream< _CharT, _Traits >::unget().
void std::ios_base::register_callback (event_callback __fn, int __index) [inherited]
Add the callback __fn with parameter __index.
Parameters
__fn The function to add.
__index The integer to pass to the function when invoked.
Registers a function as an event callback with an integer parameter to be passed to the
function when invoked. Multiple copies of the function are allowed. If there are multiple
callbacks, they are invoked in the order they were registered.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::seekp (off_type __off, ios_base::seekdir __dir)
[inherited]
Changing the current write position.
Parameters
__off A file offset object.
__dir The direction in which to seek.
Returns
*this
If fail() is not true, calls rdbuf()->pubseekoff(off,dir). If that function fails, sets
failbit.
Definition at line 289 of file ostream.tcc.
References std::ios_base::goodbit.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::seekp (pos_type __pos) [inherited]
Changing the current write position.
Parameters
__pos A file position object.
Returns
*this
If fail() is not true, calls rdbuf()->pubseekpos(pos). If that function fails, sets
failbit.
Definition at line 257 of file ostream.tcc.
References std::ios_base::goodbit.
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits
>::set_rdbuf (basic_streambuf< _CharT, _Traits > * __sb) [inline], [protected],
[inherited]
Definition at line 505 of file basic_ios.h.
fmtflags std::ios_base::setf (fmtflags __fmtfl) [inline], [inherited]
Setting new format flags.
Parameters
__fmtfl Additional flags to set.
Returns
The previous format control flags.
This function sets additional flags in format control. Flags that were previously set
remain set.
Definition at line 658 of file ios_base.h.
Referenced by std::__detail::operator>>().
fmtflags std::ios_base::setf (fmtflags __fmtfl, fmtflags __mask) [inline], [inherited]
Setting new format flags.
Parameters
__fmtfl Additional flags to set.
__mask The flags mask for fmtfl.
Returns
The previous format control flags.
This function clears mask in the format flags, then sets fmtfl & mask. An example mask is
ios_base::adjustfield.
Definition at line 675 of file ios_base.h.
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::setstate
(iostate __state) [inline], [inherited]
Sets additional flags in the error state.
Parameters
__state The additional state flag(s) to set.
See std::ios_base::iostate for the possible bit values.
Definition at line 157 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::clear(), and std::basic_ios< _CharT, _Traits
>::rdstate().
Referenced by std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::ws().
template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::swap
(basic_ios< _CharT, _Traits > & __rhs) [inline], [protected], [noexcept], [inherited]
Definition at line 494 of file basic_ios.h.
template<typename _CharT , typename _Traits > void std::basic_ofstream< _CharT, _Traits
>::swap (basic_ofstream< _CharT, _Traits > & __rhs) [inline]
Definition at line 880 of file fstream.
template<typename _CharT , typename _Traits > void std::basic_ostream< _CharT, _Traits >::swap
(basic_ostream< _CharT, _Traits > & __rhs) [inline], [protected], [inherited]
Definition at line 415 of file ostream.
static bool std::ios_base::sync_with_stdio (bool __sync = true) [static], [inherited]
Interaction with the standard C I/O objects.
Parameters
__sync Whether to synchronize or not.
Returns
True if the standard streams were previously synchronized.
The synchronization referred to is only that between the standard C facilities (e.g.,
stdout) and the standard C++ objects (e.g., cout). User-declared streams are unaffected.
See
https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits >::pos_type
std::basic_ostream< _CharT, _Traits >::tellp [inherited]
Getting the current write position.
Returns
A file position object.
If fail() is not false, returns pos_type(-1) to indicate failure. Otherwise returns
rdbuf()->pubseekoff(0,cur,out).
Definition at line 236 of file ostream.tcc.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > *
std::basic_ios< _CharT, _Traits >::tie () const [inline], [inherited]
Fetches the current tied stream.
Returns
A pointer to the tied stream, or NULL if the stream is not tied.
A stream may be tied (or synchronized) to a second output stream. When this stream
performs any I/O, the tied stream is first flushed. For example, std::cin is tied to
std::cout.
Definition at line 295 of file basic_ios.h.
Referenced by std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_ios<
_CharT, _Traits >::copyfmt().
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > *
std::basic_ios< _CharT, _Traits >::tie (basic_ostream< _CharT, _Traits > * __tiestr)
[inline], [inherited]
Ties this stream to an output stream.
Parameters
__tiestr The output stream.
Returns
The previously tied output stream, or NULL if the stream was not tied.
This sets up a new tie; see tie() for more.
Definition at line 307 of file basic_ios.h.
void std::ios_base::unsetf (fmtflags __mask) [inline], [inherited]
Clearing format flags.
Parameters
__mask The flags to unset.
This function clears __mask in the format flags.
Definition at line 690 of file ios_base.h.
template<typename _CharT , typename _Traits > char_type std::basic_ios< _CharT, _Traits
>::widen (char __c) const [inline], [inherited]
Widens characters.
Parameters
__c The character to widen.
Returns
The widened character.
Maps a character of char to a character of char_type.
Returns the result of
std::use_facet<ctype<char_type> >(getloc()).widen(c)
Additional l10n notes are at
http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 449 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::fill(), std::getline(),
std::gamma_distribution< result_type >::operator()(), and std::tr2::operator>>().
streamsize std::ios_base::width () const [inline], [inherited]
Flags access.
Returns
The minimum field width to generate on output operations.
Minimum field width refers to the number of characters.
Definition at line 724 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::num_put< _CharT,
_OutIter >::do_put().
streamsize std::ios_base::width (streamsize __wide) [inline], [inherited]
Changing flags.
Parameters
__wide The new width value.
Returns
The previous value of width().
Definition at line 733 of file ios_base.h.
template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > &
std::basic_ostream< _CharT, _Traits >::write (const char_type * __s, streamsize __n)
[inherited]
Character string insertion.
Parameters
__s The array to insert.
__n Maximum number of characters to insert.
Returns
*this
Characters are copied from __s and inserted into the stream until one of the following
happens:
• __n characters are inserted
• inserting into the output sequence fails (in this case, badbit will be set in the
stream's error state)
Note
This function is not overloaded on signed char and unsigned char.
Definition at line 182 of file ostream.tcc.
static int std::ios_base::xalloc () [static], [inherited]
Access to unique indices.
Returns
An integer different from all previous calls.
This function returns a unique integer every time it is called. It can be used for any
purpose, but is primarily intended to be a unique index for the iword and pword functions.
The expectation is that an application calls xalloc in order to obtain an index in the
iword and pword arrays that can be used without fear of conflict.
The implementation maintains a static variable that is incremented and returned on each
invocation. xalloc is guaranteed to return an index that is safe to use in the iword and
pword arrays.
Member Data Documentation
_Callback_list* std::ios_base::_M_callbacks [protected], [inherited]
Definition at line 565 of file ios_base.h.
template<typename _CharT , typename _Traits > const __ctype_type* std::basic_ios< _CharT,
_Traits >::_M_ctype [protected], [inherited]
Definition at line 102 of file basic_ios.h.
iostate std::ios_base::_M_exception [protected], [inherited]
Definition at line 530 of file ios_base.h.
template<typename _CharT , typename _Traits > char_type std::basic_ios< _CharT, _Traits
>::_M_fill [mutable], [protected], [inherited]
Definition at line 97 of file basic_ios.h.
template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits
>::_M_fill_init [mutable], [protected], [inherited]
Definition at line 98 of file basic_ios.h.
fmtflags std::ios_base::_M_flags [protected], [inherited]
Definition at line 529 of file ios_base.h.
locale std::ios_base::_M_ios_locale [protected], [inherited]
Definition at line 597 of file ios_base.h.
_Words std::ios_base::_M_local_word[_S_local_word_size] [protected], [inherited]
Definition at line 587 of file ios_base.h.
template<typename _CharT , typename _Traits > const __num_get_type* std::basic_ios< _CharT,
_Traits >::_M_num_get [protected], [inherited]
Definition at line 106 of file basic_ios.h.
template<typename _CharT , typename _Traits > const __num_put_type* std::basic_ios< _CharT,
_Traits >::_M_num_put [protected], [inherited]
Definition at line 104 of file basic_ios.h.
streamsize std::ios_base::_M_precision [protected], [inherited]
Definition at line 527 of file ios_base.h.
template<typename _CharT , typename _Traits > basic_streambuf<_CharT, _Traits>*
std::basic_ios< _CharT, _Traits >::_M_streambuf [protected], [inherited]
Definition at line 99 of file basic_ios.h.
iostate std::ios_base::_M_streambuf_state [protected], [inherited]
Definition at line 531 of file ios_base.h.
template<typename _CharT , typename _Traits > basic_ostream<_CharT, _Traits>* std::basic_ios<
_CharT, _Traits >::_M_tie [protected], [inherited]
Definition at line 96 of file basic_ios.h.
streamsize std::ios_base::_M_width [protected], [inherited]
Definition at line 528 of file ios_base.h.
_Words* std::ios_base::_M_word [protected], [inherited]
Definition at line 591 of file ios_base.h.
int std::ios_base::_M_word_size [protected], [inherited]
Definition at line 590 of file ios_base.h.
_Words std::ios_base::_M_word_zero [protected], [inherited]
Definition at line 582 of file ios_base.h.
const fmtflags std::ios_base::adjustfield [static], [inherited]
A mask of left|right|internal. Useful for the 2-arg form of setf.
Definition at line 378 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put(), std::internal(), std::left(),
and std::right().
const openmode std::ios_base::app [static], [inherited]
Seek to end before each write.
Definition at line 432 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::xsputn().
const openmode std::ios_base::ate [static], [inherited]
Open and seek to end immediately after opening.
Definition at line 435 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::open().
const iostate std::ios_base::badbit [static], [inherited]
Indicates a loss of integrity in an input or output sequence (such as an irrecoverable
read error from a file).
Definition at line 402 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::bad(), std::basic_ios< _CharT, _Traits
>::fail(), std::basic_istream< char >::get(), and std::basic_istream< char >::read().
const fmtflags std::ios_base::basefield [static], [inherited]
A mask of dec|oct|hex. Useful for the 2-arg form of setf.
Definition at line 381 of file ios_base.h.
Referenced by std::dec(), std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT,
_OutIter >::do_put(), std::hex(), and std::oct().
const seekdir std::ios_base::beg [static], [inherited]
Request a seek relative to the beginning of the stream.
Definition at line 464 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::seekpos(), and
__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::seekpos().
const openmode std::ios_base::binary [static], [inherited]
Perform input and output in binary mode (as opposed to text mode). This is probably not
what you think it is; see
https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary.
Definition at line 440 of file ios_base.h.
const fmtflags std::ios_base::boolalpha [static], [inherited]
Insert/extract bool in alphabetic rather than numeric format.
Definition at line 326 of file ios_base.h.
Referenced by std::boolalpha(), std::num_get< _CharT, _InIter >::do_get(), std::num_put<
_CharT, _OutIter >::do_put(), and std::noboolalpha().
const seekdir std::ios_base::cur [static], [inherited]
Request a seek relative to the current position within the sequence.
Definition at line 467 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::seekoff(), and std::basic_stringbuf<
_CharT, _Traits, _Alloc >::seekoff().
const fmtflags std::ios_base::dec [static], [inherited]
Converts integer input or generates integer output in decimal base.
Definition at line 329 of file ios_base.h.
Referenced by std::dec().
const seekdir std::ios_base::end [static], [inherited]
Request a seek relative to the current end of the sequence.
Definition at line 470 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::open(), and std::basic_stringbuf<
_CharT, _Traits, _Alloc >::seekoff().
const iostate std::ios_base::eofbit [static], [inherited]
Indicates that an input operation reached the end of an input sequence.
Definition at line 405 of file ios_base.h.
Referenced by std::time_get< _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter
>::do_get(), std::time_get< _CharT, _InIter >::do_get_date(), std::time_get< _CharT,
_InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_time(),
std::time_get< _CharT, _InIter >::do_get_weekday(), std::time_get< _CharT, _InIter
>::do_get_year(), std::basic_ios< _CharT, _Traits >::eof(), std::time_get< _CharT, _InIter
>::get(), std::basic_istream< char >::getline(), std::basic_istream< _CharT, _Traits
>::seekg(), std::basic_istream< _CharT, _Traits >::unget(), and std::ws().
const iostate std::ios_base::failbit [static], [inherited]
Indicates that an input operation failed to read the expected characters, or that an
output operation failed to generate the desired characters.
Definition at line 410 of file ios_base.h.
Referenced by std::basic_ostream< _CharT, _Traits >::sentry::sentry(), std::num_get<
_CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter >::do_get_monthname(),
std::time_get< _CharT, _InIter >::do_get_weekday(), std::time_get< _CharT, _InIter
>::do_get_year(), std::basic_ios< _CharT, _Traits >::fail(), std::time_get< _CharT,
_InIter >::get(), std::basic_istream< char >::getline(), and std::basic_istream< char
>::operator>>().
const fmtflags std::ios_base::fixed [static], [inherited]
Generate floating-point output in fixed-point notation.
Definition at line 332 of file ios_base.h.
Referenced by std::fixed(), and std::hexfloat().
const fmtflags std::ios_base::floatfield [static], [inherited]
A mask of scientific|fixed. Useful for the 2-arg form of setf.
Definition at line 384 of file ios_base.h.
Referenced by std::defaultfloat(), std::fixed(), std::hexfloat(), and std::scientific().
const iostate std::ios_base::goodbit [static], [inherited]
Indicates all is well.
Definition at line 413 of file ios_base.h.
Referenced by std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::time_get<
_CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::time_get<
_CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_weekday(),
std::time_get< _CharT, _InIter >::do_get_year(), std::basic_ostream< _CharT, _Traits
>::flush(), std::basic_istream< _CharT, _Traits >::get(), std::time_get< _CharT, _InIter
>::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT,
_Traits >::ignore(), std::basic_ostream< _CharT, _Traits >::operator<<(),
std::operator>>(), std::basic_istream< _CharT, _Traits >::operator>>(),
std::basic_istream< char >::operator>>(), std::basic_istream< _CharT, _Traits >::peek(),
std::basic_istream< char >::peek(), std::basic_ostream< _CharT, _Traits >::put(),
std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits
>::readsome(), std::basic_istream< char >::readsome(), std::basic_istream< _CharT, _Traits
>::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT,
_Traits >::sync(), and std::basic_istream< _CharT, _Traits >::unget().
const fmtflags std::ios_base::hex [static], [inherited]
Converts integer input or generates integer output in hexadecimal base.
Definition at line 335 of file ios_base.h.
Referenced by std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter
>::do_put(), and std::hex().
const openmode std::ios_base::in [static], [inherited]
Open for input. Default for ifstream and fstream.
Definition at line 443 of file ios_base.h.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(),
std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT,
_Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(),
std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), and std::basic_filebuf<
_CharT, _Traits >::xsgetn().
const fmtflags std::ios_base::internal [static], [inherited]
Adds fill characters at a designated internal point in certain generated output, or
identical to right if no such point is designated.
Definition at line 340 of file ios_base.h.
Referenced by std::internal().
const fmtflags std::ios_base::left [static], [inherited]
Adds fill characters on the right (final positions) of certain generated output. (I.e.,
the thing you print is flush left.)
Definition at line 344 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put(), and std::left().
const fmtflags std::ios_base::oct [static], [inherited]
Converts integer input or generates integer output in octal base.
Definition at line 347 of file ios_base.h.
Referenced by std::oct().
const openmode std::ios_base::out [static], [inherited]
Open for output. Default for ofstream and fstream.
Definition at line 446 of file ios_base.h.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(),
std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), and std::basic_filebuf<
_CharT, _Traits >::xsputn().
const fmtflags std::ios_base::right [static], [inherited]
Adds fill characters on the left (initial positions) of certain generated output. (I.e.,
the thing you print is flush right.)
Definition at line 351 of file ios_base.h.
Referenced by std::right().
const fmtflags std::ios_base::scientific [static], [inherited]
Generates floating-point output in scientific notation.
Definition at line 354 of file ios_base.h.
Referenced by std::hexfloat(), and std::scientific().
const fmtflags std::ios_base::showbase [static], [inherited]
Generates a prefix indicating the numeric base of generated integer output.
Definition at line 358 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put(), std::noshowbase(), and
std::showbase().
const fmtflags std::ios_base::showpoint [static], [inherited]
Generates a decimal-point character unconditionally in generated floating-point output.
Definition at line 362 of file ios_base.h.
Referenced by std::noshowpoint(), and std::showpoint().
const fmtflags std::ios_base::showpos [static], [inherited]
Generates a + sign in non-negative generated numeric output.
Definition at line 365 of file ios_base.h.
Referenced by std::noshowpos(), and std::showpos().
const fmtflags std::ios_base::skipws [static], [inherited]
Skips leading white space before certain input operations.
Definition at line 368 of file ios_base.h.
Referenced by std::noskipws(), std::__detail::operator>>(), and std::skipws().
const openmode std::ios_base::trunc [static], [inherited]
Truncate an existing stream when opening. Default for ofstream.
Definition at line 449 of file ios_base.h.
const fmtflags std::ios_base::unitbuf [static], [inherited]
Flushes output after each output operation.
Definition at line 371 of file ios_base.h.
Referenced by std::nounitbuf(), and std::unitbuf().
const fmtflags std::ios_base::uppercase [static], [inherited]
Replaces certain lowercase letters with their uppercase equivalents in generated output.
Definition at line 375 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put(), std::nouppercase(), and
std::uppercase().
Author
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