libstdc++
std::basic_ios< _CharT, _Traits > Class Template Reference
Inheritance diagram for std::basic_ios< _CharT, _Traits >:
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Public Types

enum  event { erase_event, imbue_event, copyfmt_event }
 
typedef void(* event_callback )(event __e, ios_base &__b, int __i)
 
typedef _Ios_Fmtflags fmtflags
 
typedef int io_state
 
typedef _Ios_Iostate iostate
 
typedef int open_mode
 
typedef _Ios_Openmode openmode
 
typedef int seek_dir
 
typedef _Ios_Seekdir seekdir
 
typedef std::streamoff streamoff
 
typedef std::streampos streampos
 
typedef _CharT char_type
 
typedef _Traits::int_type int_type
 
typedef _Traits::pos_type pos_type
 
typedef _Traits::off_type off_type
 
typedef _Traits traits_type
 
typedef ctype< _CharT > __ctype_type
 
typedef num_put< _CharT,
ostreambuf_iterator< _CharT,
_Traits > > 
__num_put_type
 
typedef num_get< _CharT,
istreambuf_iterator< _CharT,
_Traits > > 
__num_get_type
 

Public Member Functions

 basic_ios (basic_streambuf< _CharT, _Traits > *__sb)
 
virtual ~basic_ios ()
 
const locale_M_getloc () const
 
void _M_setstate (iostate __state)
 
bool bad () const
 
void clear (iostate __state=goodbit)
 
basic_ioscopyfmt (const basic_ios &__rhs)
 
bool eof () const
 
iostate exceptions () const
 
void exceptions (iostate __except)
 
bool fail () const
 
char_type fill () const
 
char_type fill (char_type __ch)
 
fmtflags flags () const
 
fmtflags flags (fmtflags __fmtfl)
 
locale getloc () const
 
bool good () const
 
locale imbue (const locale &__loc)
 
long & iword (int __ix)
 
char narrow (char_type __c, char __dfault) const
 
streamsize precision () const
 
streamsize precision (streamsize __prec)
 
void *& pword (int __ix)
 
basic_streambuf< _CharT,
_Traits > * 
rdbuf () const
 
basic_streambuf< _CharT,
_Traits > * 
rdbuf (basic_streambuf< _CharT, _Traits > *__sb)
 
iostate rdstate () const
 
void register_callback (event_callback __fn, int __index)
 
fmtflags setf (fmtflags __fmtfl)
 
fmtflags setf (fmtflags __fmtfl, fmtflags __mask)
 
void setstate (iostate __state)
 
basic_ostream< _CharT, _Traits > * tie () const
 
basic_ostream< _CharT, _Traits > * tie (basic_ostream< _CharT, _Traits > *__tiestr)
 
void unsetf (fmtflags __mask)
 
char_type widen (char __c) const
 
streamsize width () const
 
streamsize width (streamsize __wide)
 
 operator void * () const
 
bool operator! () const
 

Static Public Member Functions

static bool sync_with_stdio (bool __sync=true)
 
static int xalloc () throw ()
 

Static Public Attributes

static const fmtflags adjustfield
 
static const openmode app
 
static const openmode ate
 
static const iostate badbit
 
static const fmtflags basefield
 
static const seekdir beg
 
static const openmode binary
 
static const fmtflags boolalpha
 
static const seekdir cur
 
static const fmtflags dec
 
static const seekdir end
 
static const iostate eofbit
 
static const iostate failbit
 
static const fmtflags fixed
 
static const fmtflags floatfield
 
static const iostate goodbit
 
static const fmtflags hex
 
static const openmode in
 
static const fmtflags internal
 
static const fmtflags left
 
static const fmtflags oct
 
static const openmode out
 
static const fmtflags right
 
static const fmtflags scientific
 
static const fmtflags showbase
 
static const fmtflags showpoint
 
static const fmtflags showpos
 
static const fmtflags skipws
 
static const openmode trunc
 
static const fmtflags unitbuf
 
static const fmtflags uppercase
 

Protected Types

enum  { _S_local_word_size }
 

Protected Member Functions

 basic_ios ()
 
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 ()
 
void init (basic_streambuf< _CharT, _Traits > *__sb)
 

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 = char_traits<_CharT>>
class std::basic_ios< _CharT, _Traits >

Template class basic_ios, virtual base class for all stream classes.

Template Parameters
_CharTType of character stream.
_TraitsTraits for character type, defaults to char_traits<_CharT>.

Most of the member functions called dispatched on stream objects (e.g., std::cout.foo(bar);) are consolidated in this class.

Definition at line 77 of file iosfwd.

Member Typedef Documentation

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef ctype<_CharT> std::basic_ios< _CharT, _Traits >::__ctype_type

These are non-standard types.

Definition at line 86 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_get_type

These are non-standard types.

Definition at line 90 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_put_type

These are non-standard types.

Definition at line 88 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef _CharT std::basic_ios< _CharT, _Traits >::char_type

These are standard types. They permit a standardized way of referring to names of (or names dependent on) the template parameters, which are specific to the implementation.

Definition at line 75 of file basic_ios.h.

typedef void(* std::ios_base::event_callback)(event __e, ios_base &__b, int __i)
inherited

The type of an event callback function.

Parameters
__eOne of the members of the event enum.
__bReference to the ios_base object.
__iThe 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 436 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 255 of file ios_base.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef _Traits::int_type std::basic_ios< _CharT, _Traits >::int_type

These are standard types. They permit a standardized way of referring to names of (or names dependent on) the template parameters, which are specific to the implementation.

Definition at line 76 of file basic_ios.h.

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 330 of file ios_base.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef _Traits::off_type std::basic_ios< _CharT, _Traits >::off_type

These are standard types. They permit a standardized way of referring to names of (or names dependent on) the template parameters, which are specific to the implementation.

Definition at line 78 of file basic_ios.h.

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 361 of file ios_base.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef _Traits::pos_type std::basic_ios< _CharT, _Traits >::pos_type

These are standard types. They permit a standardized way of referring to names of (or names dependent on) the template parameters, which are specific to the implementation.

Definition at line 77 of file basic_ios.h.

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 393 of file ios_base.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
typedef _Traits std::basic_ios< _CharT, _Traits >::traits_type

These are standard types. They permit a standardized way of referring to names of (or names dependent on) the template parameters, which are specific to the implementation.

Definition at line 79 of file basic_ios.h.

Member Enumeration Documentation

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 419 of file ios_base.h.

Constructor & Destructor Documentation

template<typename _CharT, typename _Traits = char_traits<_CharT>>
std::basic_ios< _CharT, _Traits >::basic_ios ( basic_streambuf< _CharT, _Traits > *  __sb)
inlineexplicit

Constructor performs initialization.

The parameter is passed by derived streams.

Definition at line 264 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
virtual std::basic_ios< _CharT, _Traits >::~basic_ios ( )
inlinevirtual

Empty.

The destructor does nothing. More specifically, it does not destroy the streambuf held by rdbuf().

Definition at line 276 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
std::basic_ios< _CharT, _Traits >::basic_ios ( )
inlineprotected

Empty.

The default constructor does nothing and is not normally accessible to users.

Definition at line 454 of file basic_ios.h.

Member Function Documentation

template<typename _CharT, typename _Traits = char_traits<_CharT>>
bool std::basic_ios< _CharT, _Traits >::bad ( ) const
inline

Fast error checking.

Returns
True if the badbit is set.

Note that other iostate flags may also be set.

Definition at line 205 of file basic_ios.h.

template<typename _CharT , typename _Traits >
void std::basic_ios< _CharT, _Traits >::clear ( iostate  __state = goodbit)
template<typename _CharT , typename _Traits >
basic_ios< _CharT, _Traits > & std::basic_ios< _CharT, _Traits >::copyfmt ( const basic_ios< _CharT, _Traits > &  __rhs)

Copies fields of __rhs into this.

Parameters
__rhsThe 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 = char_traits<_CharT>>
bool std::basic_ios< _CharT, _Traits >::eof ( ) const
inline

Fast error checking.

Returns
True if the eofbit is set.

Note that other iostate flags may also be set.

Definition at line 184 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
iostate std::basic_ios< _CharT, _Traits >::exceptions ( ) const
inline

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 216 of file basic_ios.h.

Referenced by std::basic_ios< _CharT, _Traits >::copyfmt().

template<typename _CharT, typename _Traits = char_traits<_CharT>>
void std::basic_ios< _CharT, _Traits >::exceptions ( iostate  __except)
inline

Throwing exceptions on errors.

Parameters
__exceptThe 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::ifstream f ("/etc/motd");
*
* std::cerr << "Setting badbit\n";
*
* std::cerr << "Setting exception mask\n";
* }
*

Definition at line 251 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
bool std::basic_ios< _CharT, _Traits >::fail ( ) const
inline

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 195 of file basic_ios.h.

Referenced by std::basic_ios< char, char_traits< char > >::operator void *(), std::basic_ios< char, char_traits< char > >::operator!(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::tellg(), std::basic_ostream< _CharT, _Traits >::tellp(), and std::regex_traits< _Ch_type >::value().

template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type std::basic_ios< _CharT, _Traits >::fill ( ) const
inline

Retrieves the empty character.

Returns
The current fill character.

It defaults to a space (' ') in the current locale.

Definition at line 364 of file basic_ios.h.

Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::basic_ios< char, char_traits< char > >::fill().

template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type std::basic_ios< _CharT, _Traits >::fill ( char_type  __ch)
inline

Sets a new empty character.

Parameters
__chThe 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 384 of file basic_ios.h.

fmtflags std::ios_base::flags ( ) const
inlineinherited
fmtflags std::ios_base::flags ( fmtflags  __fmtfl)
inlineinherited

Setting new format flags all at once.

Parameters
__fmtflThe new flags to set.
Returns
The previous format control flags.

This function overwrites all the format flags with __fmtfl.

Definition at line 562 of file ios_base.h.

locale std::ios_base::getloc ( ) const
inlineinherited

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 695 of file ios_base.h.

Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::money_put< _CharT, _OutIter >::do_put(), std::operator>>(), and std::ws().

template<typename _CharT, typename _Traits = char_traits<_CharT>>
bool std::basic_ios< _CharT, _Traits >::good ( ) const
inline

Fast error checking.

Returns
True if no error flags are set.

A wrapper around rdstate.

Definition at line 174 of file basic_ios.h.

Referenced by std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().

template<typename _CharT , typename _Traits >
locale std::basic_ios< _CharT, _Traits >::imbue ( const locale __loc)

Moves to a new locale.

Parameters
__locThe 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().

Referenced by std::operator<<().

long& std::ios_base::iword ( int  __ix)
inlineinherited

Access to integer array.

Parameters
__ixIndex 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 741 of file ios_base.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
char std::basic_ios< _CharT, _Traits >::narrow ( char_type  __c,
char  __dfault 
) const
inline

Squeezes characters.

Parameters
__cThe character to narrow.
__dfaultThe 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 424 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
std::basic_ios< _CharT, _Traits >::operator void * ( ) const
inline

The quick-and-easy status check.

This allows you to write constructs such as if (!a_stream) ... and while (a_stream) ...

Definition at line 115 of file basic_ios.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
bool std::basic_ios< _CharT, _Traits >::operator! ( ) const
inline

The quick-and-easy status check.

This allows you to write constructs such as if (!a_stream) ... and while (a_stream) ...

Definition at line 119 of file basic_ios.h.

streamsize std::ios_base::precision ( ) const
inlineinherited

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 621 of file ios_base.h.

Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::operator<<().

streamsize std::ios_base::precision ( streamsize  __prec)
inlineinherited

Changing flags.

Parameters
__precThe new precision value.
Returns
The previous value of precision().

Definition at line 630 of file ios_base.h.

void*& std::ios_base::pword ( int  __ix)
inlineinherited

Access to void pointer array.

Parameters
__ixIndex 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 762 of file ios_base.h.

template<typename _CharT, typename _Traits>
basic_streambuf< _CharT, _Traits > * std::basic_ios< _CharT, _Traits >::rdbuf ( basic_streambuf< _CharT, _Traits > *  __sb)

Changing the underlying buffer.

Parameters
__sbThe 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 = char_traits<_CharT>>
iostate std::basic_ios< _CharT, _Traits >::rdstate ( ) const
inline

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 131 of file basic_ios.h.

Referenced by std::basic_ios< char, char_traits< char > >::bad(), std::basic_ios< char, char_traits< char > >::eof(), std::basic_ios< char, char_traits< char > >::fail(), std::basic_ios< char, char_traits< char > >::good(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ios< char, char_traits< char > >::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
__fnThe function to add.
__indexThe 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.

fmtflags std::ios_base::setf ( fmtflags  __fmtfl)
inlineinherited

Setting new format flags.

Parameters
__fmtflAdditional 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 578 of file ios_base.h.

Referenced by std::dec(), std::fixed(), std::hex(), std::left(), std::oct(), std::right(), std::scientific(), std::showbase(), std::showpoint(), std::showpos(), std::skipws(), std::unitbuf(), and std::uppercase().

fmtflags std::ios_base::setf ( fmtflags  __fmtfl,
fmtflags  __mask 
)
inlineinherited

Setting new format flags.

Parameters
__fmtflAdditional flags to set.
__maskThe 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 595 of file ios_base.h.

template<typename _CharT, typename _Traits = char_traits<_CharT>>
void std::basic_ios< _CharT, _Traits >::setstate ( iostate  __state)
inline
static bool std::ios_base::sync_with_stdio ( bool  __sync = true)
staticinherited

Interaction with the standard C I/O objects.

Parameters
__syncWhether 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 http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch28s02.html

template<typename _CharT, typename _Traits = char_traits<_CharT>>
basic_ostream<_CharT, _Traits>* std::basic_ios< _CharT, _Traits >::tie ( ) const
inline

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 289 of file basic_ios.h.

Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().

template<typename _CharT, typename _Traits = char_traits<_CharT>>
basic_ostream<_CharT, _Traits>* std::basic_ios< _CharT, _Traits >::tie ( basic_ostream< _CharT, _Traits > *  __tiestr)
inline

Ties this stream to an output stream.

Parameters
__tiestrThe 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 301 of file basic_ios.h.

void std::ios_base::unsetf ( fmtflags  __mask)
inlineinherited

Clearing format flags.

Parameters
__maskThe flags to unset.

This function clears __mask in the format flags.

Definition at line 610 of file ios_base.h.

Referenced by std::noboolalpha(), std::noshowbase(), std::noshowpoint(), std::noshowpos(), std::noskipws(), std::nounitbuf(), and std::nouppercase().

template<typename _CharT, typename _Traits = char_traits<_CharT>>
char_type std::basic_ios< _CharT, _Traits >::widen ( char  __c) const
inline

Widens characters.

Parameters
__cThe 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 443 of file basic_ios.h.

Referenced by std::basic_ios< char, char_traits< char > >::fill(), std::basic_istream< char >::get(), std::basic_istream< char >::getline(), std::getline(), and std::operator>>().

streamsize std::ios_base::width ( ) const
inlineinherited

Flags access.

Returns
The minimum field width to generate on output operations.

Minimum field width refers to the number of characters.

Definition at line 644 of file ios_base.h.

Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::num_put< _CharT, _OutIter >::do_put(), and std::operator>>().

streamsize std::ios_base::width ( streamsize  __wide)
inlineinherited

Changing flags.

Parameters
__wideThe new width value.
Returns
The previous value of width().

Definition at line 653 of file ios_base.h.

static int std::ios_base::xalloc ( )
throw (
)
staticinherited

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

const fmtflags std::ios_base::adjustfield
staticinherited

A mask of left|right|internal. Useful for the 2-arg form of setf.

Definition at line 310 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
staticinherited

Seek to end before each write.

Definition at line 364 of file ios_base.h.

Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer(), and std::basic_filebuf< _CharT, _Traits >::xsputn().

const openmode std::ios_base::ate
staticinherited

Open and seek to end immediately after opening.

Definition at line 367 of file ios_base.h.

Referenced by std::basic_filebuf< _CharT, _Traits >::open().

const fmtflags std::ios_base::basefield
staticinherited

A mask of dec|oct|hex. Useful for the 2-arg form of setf.

Definition at line 313 of file ios_base.h.

Referenced by std::dec(), std::num_get< _CharT, _InIter >::do_get(), std::hex(), std::oct(), and std::basic_ostream< _CharT, _Traits >::operator<<().

const seekdir std::ios_base::beg
staticinherited

Request a seek relative to the beginning of the stream.

Definition at line 396 of file ios_base.h.

Referenced by std::basic_filebuf< _CharT, _Traits >::seekpos().

const openmode std::ios_base::binary
staticinherited

Perform input and output in binary mode (as opposed to text mode). This is probably not what you think it is; see http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch27s02.html.

Definition at line 372 of file ios_base.h.

Referenced by std::basic_filebuf< _CharT, _Traits >::showmanyc().

const fmtflags std::ios_base::boolalpha
staticinherited

Insert/extract bool in alphabetic rather than numeric format.

Definition at line 258 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 fmtflags std::ios_base::dec
staticinherited

Converts integer input or generates integer output in decimal base.

Definition at line 261 of file ios_base.h.

Referenced by std::dec().

const seekdir std::ios_base::end
staticinherited

Request a seek relative to the current end of the sequence.

Definition at line 402 of file ios_base.h.

Referenced by std::basic_filebuf< _CharT, _Traits >::open(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff().

const fmtflags std::ios_base::fixed
staticinherited

Generate floating-point output in fixed-point notation.

Definition at line 264 of file ios_base.h.

Referenced by std::fixed().

const fmtflags std::ios_base::floatfield
staticinherited

A mask of scientific|fixed. Useful for the 2-arg form of setf.

Definition at line 316 of file ios_base.h.

Referenced by std::fixed(), and std::scientific().

const fmtflags std::ios_base::hex
staticinherited

Converts integer input or generates integer output in hexadecimal base.

Definition at line 267 of file ios_base.h.

Referenced by std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), std::hex(), and std::basic_ostream< _CharT, _Traits >::operator<<().

const fmtflags std::ios_base::internal
staticinherited

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 272 of file ios_base.h.

Referenced by std::internal().

const fmtflags std::ios_base::left
staticinherited

Adds fill characters on the right (final positions) of certain generated output. (I.e., the thing you print is flush left.)

Definition at line 276 of file ios_base.h.

Referenced by std::num_put< _CharT, _OutIter >::do_put(), and std::left().

const fmtflags std::ios_base::oct
staticinherited

Converts integer input or generates integer output in octal base.

Definition at line 279 of file ios_base.h.

Referenced by std::oct(), and std::basic_ostream< _CharT, _Traits >::operator<<().

const fmtflags std::ios_base::right
staticinherited

Adds fill characters on the left (initial positions) of certain generated output. (I.e., the thing you print is flush right.)

Definition at line 283 of file ios_base.h.

Referenced by std::right().

const fmtflags std::ios_base::scientific
staticinherited

Generates floating-point output in scientific notation.

Definition at line 286 of file ios_base.h.

Referenced by std::scientific().

const fmtflags std::ios_base::showbase
staticinherited

Generates a prefix indicating the numeric base of generated integer output.

Definition at line 290 of file ios_base.h.

Referenced by std::noshowbase(), and std::showbase().

const fmtflags std::ios_base::showpoint
staticinherited

Generates a decimal-point character unconditionally in generated floating-point output.

Definition at line 294 of file ios_base.h.

Referenced by std::noshowpoint(), and std::showpoint().

const fmtflags std::ios_base::showpos
staticinherited

Generates a + sign in non-negative generated numeric output.

Definition at line 297 of file ios_base.h.

Referenced by std::noshowpos(), and std::showpos().

const fmtflags std::ios_base::skipws
staticinherited

Skips leading white space before certain input operations.

Definition at line 300 of file ios_base.h.

Referenced by std::noskipws(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), and std::skipws().

const openmode std::ios_base::trunc
staticinherited

Open for input. Default for ofstream.

Definition at line 381 of file ios_base.h.

const fmtflags std::ios_base::unitbuf
staticinherited

Flushes output after each output operation.

Definition at line 303 of file ios_base.h.

Referenced by std::nounitbuf(), std::unitbuf(), and std::basic_ostream< _CharT, _Traits >::sentry::~sentry().

const fmtflags std::ios_base::uppercase
staticinherited

Replaces certain lowercase letters with their uppercase equivalents in generated output.

Definition at line 307 of file ios_base.h.

Referenced by std::num_put< _CharT, _OutIter >::do_put(), std::nouppercase(), and std::uppercase().


The documentation for this class was generated from the following files: