std::basic_istream

std::basic_istream< _CharT, _Traits > Class Template Reference

Inheritance diagram for std::basic_istream< _CharT, _Traits >:

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List of all members.

Detailed Description

template<typename _CharT, typename _Traits>
class std::basic_istream< _CharT, _Traits >

This is the base class for all input streams. It provides text formatting of all builtin types, and communicates with any class derived from basic_streambuf to do the actual input.

Definition at line 58 of file istream.

Public Types

Public Member Functions

Unformatted Input Functions
All the unformatted input functions have some common behavior. Each starts by constructing a temporary object of type std::basic_istream::sentry with the second argument (noskipws) set to true. 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 extract whatever data is appropriate for the type of the argument.

The number of characters extracted is stored for later retrieval by gcount().

If an exception is thrown during extraction, 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.

Arithmetic Extractors
All the operator>> functions (aka formatted input functions) have some common behavior. Each starts by constructing a temporary object of type std::basic_istream::sentry with the second argument (noskipws) set to false. 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 extract whatever data is appropriate for the type of the argument.

If an exception is thrown during extraction, 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.

Static Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Protected Attributes

Friends

Classes

Member Typedef Documentation

template<typename _CharT, typename _Traits>
typedef _CharT std::basic_istream< _CharT, _Traits >::char_type

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

Reimplemented from std::basic_ios< _CharT, _Traits >.

Reimplemented in std::basic_ifstream< _CharT, _Traits >, std::basic_fstream< _CharT, _Traits >, std::basic_iostream< _CharT, _Traits >, std::basic_istringstream< _CharT, _Traits, _Alloc >, and std::basic_stringstream< _CharT, _Traits, _Alloc >.

Definition at line 62 of file istream.

typedef void(*) std::ios_base::event_callback(event, ios_base &, int) [inherited]

The type of an event callback function.

Parameters:
event One of the members of the event enum.
ios_base Reference to the ios_base object.
int 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 435 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:

Definition at line 253 of file ios_base.h.

template<typename _CharT, typename _Traits>
typedef _Traits::int_type std::basic_istream< _CharT, _Traits >::int_type

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

Reimplemented from std::basic_ios< _CharT, _Traits >.

Reimplemented in std::basic_ifstream< _CharT, _Traits >, std::basic_fstream< _CharT, _Traits >, std::basic_iostream< _CharT, _Traits >, std::basic_istringstream< _CharT, _Traits, _Alloc >, and std::basic_stringstream< _CharT, _Traits, _Alloc >.

Definition at line 63 of file istream.

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:

Definition at line 328 of file ios_base.h.

template<typename _CharT, typename _Traits>
typedef _Traits::off_type std::basic_istream< _CharT, _Traits >::off_type

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

Reimplemented from std::basic_ios< _CharT, _Traits >.

Reimplemented in std::basic_ifstream< _CharT, _Traits >, std::basic_fstream< _CharT, _Traits >, std::basic_iostream< _CharT, _Traits >, std::basic_istringstream< _CharT, _Traits, _Alloc >, and std::basic_stringstream< _CharT, _Traits, _Alloc >.

Definition at line 65 of file istream.

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:

Definition at line 359 of file ios_base.h.

template<typename _CharT, typename _Traits>
typedef _Traits::pos_type std::basic_istream< _CharT, _Traits >::pos_type

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

Reimplemented from std::basic_ios< _CharT, _Traits >.

Reimplemented in std::basic_ifstream< _CharT, _Traits >, std::basic_fstream< _CharT, _Traits >, std::basic_iostream< _CharT, _Traits >, std::basic_istringstream< _CharT, _Traits, _Alloc >, and std::basic_stringstream< _CharT, _Traits, _Alloc >.

Definition at line 64 of file istream.

typedef _Ios_Seekdir std::ios_base::seekdir [inherited]

This is an enumerated type.

"_Ios_Seekdir" is implementation-defined. Defined values of type seekdir are:

Definition at line 392 of file ios_base.h.

template<typename _CharT, typename _Traits>
typedef _Traits std::basic_istream< _CharT, _Traits >::traits_type

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

Reimplemented from std::basic_ios< _CharT, _Traits >.

Reimplemented in std::basic_ifstream< _CharT, _Traits >, std::basic_fstream< _CharT, _Traits >, std::basic_iostream< _CharT, _Traits >, std::basic_istringstream< _CharT, _Traits, _Alloc >, and std::basic_stringstream< _CharT, _Traits, _Alloc >.

Definition at line 66 of file istream.

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 418 of file ios_base.h.

Constructor & Destructor Documentation

template<typename _CharT, typename _Traits>
std::basic_istream< _CharT, _Traits >::basic_istream ( __streambuf_type *  __sb  )  [inline, explicit]

Base constructor.

This ctor is almost never called by the user directly, rather from derived classes' initialization lists, which pass a pointer to their own stream buffer.

Definition at line 104 of file istream.

template<typename _CharT, typename _Traits>
virtual std::basic_istream< _CharT, _Traits >::~basic_istream (  )  [inline, virtual]

Base destructor.

This does very little apart from providing a virtual base dtor.

Definition at line 113 of file istream.

Member Function Documentation

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 700 of file ios_base.h.

Referenced by std::money_get< _CharT, _InIter >::_M_extract(), std::num_get< _CharT, _InIter >::_M_extract_float(), std::num_get< _CharT, _InIter >::_M_extract_int(), std::time_get< _CharT, _InIter >::_M_extract_name(), std::time_get< _CharT, _InIter >::_M_extract_num(), std::time_get< _CharT, _InIter >::_M_extract_via_format(), std::money_put< _CharT, _OutIter >::_M_insert(), std::num_put< _CharT, _OutIter >::_M_insert_float(), std::num_put< _CharT, _OutIter >::_M_insert_int(), std::__pad< _CharT, _Traits >::_S_pad(), std::money_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::time_put< _CharT, _OutIter >::do_put(), std::num_put< _CharT, _OutIter >::do_put(), and std::time_put< _CharT, _OutIter >::put().

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 197 of file basic_ios.h.

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 45 of file basic_ios.tcc.

References __N.

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

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 67 of file basic_ios.tcc.

References std::basic_ios< _CharT, _Traits >::_M_cache_locale(), std::ios_base::_M_callbacks, std::ios_base::_M_ios_locale, std::ios_base::_M_local_word, std::ios_base::_M_word, std::ios_base::_M_word_size, 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(), 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 176 of file basic_ios.h.

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 flage 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 badbit\n";
      f.setstate (std::ios_base::badbit);

      std::cerr << "Setting exception mask\n";
      f.exceptions (std::ios_base::badbit);
  }

Definition at line 243 of file basic_ios.h.

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 208 of file basic_ios.h.

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

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 187 of file basic_ios.h.

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 376 of file basic_ios.h.

References std::fill().

template<typename _CharT, typename _Traits>
char_type std::basic_ios< _CharT, _Traits >::fill (  )  const [inline, inherited]

Retreives the "empty" character.

Returns:
The current fill character.
It defaults to a space (' ') in the current locale.

Definition at line 356 of file basic_ios.h.

Referenced by std::__ostream_fill(), std::basic_ios< _CharT, _Traits >::copyfmt(), std::operator<<(), and std::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 558 of file ios_base.h.

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 548 of file ios_base.h.

Referenced by std::__ostream_insert(), std::money_get< _CharT, _InIter >::_M_extract(), std::num_get< _CharT, _InIter >::_M_extract_int(), std::money_put< _CharT, _OutIter >::_M_insert(), std::num_put< _CharT, _OutIter >::_M_insert_float(), std::num_put< _CharT, _OutIter >::_M_insert_int(), std::__pad< _CharT, _Traits >::_S_pad(), std::basic_ios< _CharT, _Traits >::copyfmt(), std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), __gnu_cxx::operator<<(), std::tr1::operator<<(), std::basic_ostream< _CharT, _Traits >::operator<<(), and std::tr1::operator>>().

template<typename _CharT, typename _Traits>
streamsize std::basic_istream< _CharT, _Traits >::gcount (  )  const [inline]

Character counting.

Returns:
The number of characters extracted by the previous unformatted input function dispatched for this stream.

Definition at line 260 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::get ( __streambuf_type &  __sb  )  [inline]

Extraction into another streambuf.

Parameters:
sb A streambuf in which to store data.
Returns:
*this
Returns get(sb,widen('
')).

Definition at line 377 of file istream.

References std::tr1::get().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::get ( __streambuf_type &  __sb,
char_type  __delim 
)

Extraction into another streambuf.

Parameters:
sb A streambuf in which to store data.
delim A "stop" character.
Returns:
*this
Characters are extracted and inserted into sb until one of the following happens:

If no characters are stored, failbit is set in the stream's error state.

Definition at line 287 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), std::basic_streambuf< _CharT, _Traits >::snextc(), and std::basic_streambuf< _CharT, _Traits >::sputc().

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::get ( char_type *  __s,
streamsize  __n 
) [inline]

Simple multiple-character extraction.

Parameters:
s Pointer to an array.
n Maximum number of characters to store in s.
Returns:
*this
Returns get(s,n,widen('
')).

Definition at line 344 of file istream.

References std::tr1::get().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::get ( char_type *  __s,
streamsize  __n,
char_type  __delim 
)

Simple multiple-character extraction.

Parameters:
s Pointer to an array.
n Maximum number of characters to store in s.
delim A "stop" character.
Returns:
*this
Characters are extracted and stored into s until one of the following happens:

If no characters are stored, failbit is set in the stream's error state.

In any case, a null character is stored into the next location in the array.

Note:
This function is not overloaded on signed char and unsigned char.

Definition at line 245 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::get ( char_type &  __c  ) 

Simple extraction.

Parameters:
c The character in which to store data.
Returns:
*this
Tries to extract a character and store it in c. If none are available, sets failbit and returns traits::eof().

Note:
This function is not overloaded on signed char and unsigned char.

Definition at line 213 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits >::int_type std::basic_istream< _CharT, _Traits >::get (  ) 

Simple extraction.

Returns:
A character, or eof().
Tries to extract a character. If none are available, sets failbit and returns traits::eof().

Definition at line 182 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::getline ( char_type *  __s,
streamsize  __n 
) [inline]

String extraction.

Parameters:
s A character array in which to store the data.
n Maximum number of characters to extract.
Returns:
*this
Returns getline(s,n,widen('
')).

Definition at line 417 of file istream.

References __gnu_debug::getline().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::getline ( char_type *  __s,
streamsize  __n,
char_type  __delim 
)

String extraction.

Parameters:
s A character array in which to store the data.
n Maximum number of characters to extract.
delim A "stop" character.
Returns:
*this
Extracts and stores characters into s until one of the following happens. Note that these criteria are required to be tested in the order listed here, to allow an input line to exactly fill the s array without setting failbit.

  1. the input sequence reaches end-of-file, in which case eofbit is set in the stream error state
  2. the next character equals delim, in which case the character is extracted (and therefore counted in gcount()) but not stored
  3. n-1 characters are stored, in which case failbit is set in the stream error state

If no characters are extracted, failbit is set. (An empty line of input should therefore not cause failbit to be set.)

In any case, a null character is stored in the next location in the array.

Definition at line 326 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_streambuf< _CharT, _Traits >::sbumpc(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().

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 690 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>
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 166 of file basic_ios.h.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::ignore ( streamsize  __n,
int_type  __delim 
)

Extraction into another streambuf.

Parameters:
sb A streambuf in which to store data.
Returns:
*this
Returns get(sb,widen('
')).

Definition at line 465 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::goodbit, std::max(), std::min(), std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_streambuf< _CharT, _Traits >::sbumpc(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::ignore ( streamsize  __n  ) 

Extraction into another streambuf.

Parameters:
sb A streambuf in which to store data.
Returns:
*this
Returns get(sb,widen('
')).

Definition at line 409 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::goodbit, std::max(), std::min(), std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::ignore (  ) 

Discarding characters.

Parameters:
n Number of characters to discard.
delim A "stop" character.
Returns:
*this
Extracts characters and throws them away until one of the following happens:

NB: Provide three overloads, instead of the single function (with defaults) mandated by the Standard: this leads to a better performing implementation, while still conforming to the Standard.

Definition at line 381 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_streambuf< _CharT, _Traits >::sbumpc(), and std::basic_ios< _CharT, _Traits >::setstate().

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++/22_locale/howto.html

Reimplemented from std::ios_base.

Definition at line 128 of file basic_ios.tcc.

References std::basic_ios< _CharT, _Traits >::_M_cache_locale(), and 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 140 of file basic_ios.tcc.

References std::basic_ios< _CharT, _Traits >::_M_cache_locale(), std::ios_base::_M_exception, std::basic_ios< _CharT, _Traits >::_M_fill, std::basic_ios< _CharT, _Traits >::_M_fill_init, std::ios_base::_M_ios_locale, std::basic_ios< _CharT, _Traits >::_M_streambuf, std::ios_base::_M_streambuf_state, std::basic_ios< _CharT, _Traits >::_M_tie, std::ios_base::badbit, and std::ios_base::goodbit.

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 734 of file ios_base.h.

References std::ios_base::_Words::_M_iword.

template<typename _CharT, typename _Traits>
char std::basic_ios< _CharT, _Traits >::narrow ( char_type  __c,
char  __dfault 
) const [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++/22_locale/howto.html

Definition at line 117 of file basic_ios.tcc.

References std::__check_facet(), and std::basic_ios< _CharT, _Traits >::_M_ctype.

template<typename _CharT, typename _Traits>
std::basic_ios< _CharT, _Traits >::operator void * (  )  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 107 of file basic_ios.h.

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 111 of file basic_ios.h.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::operator>> ( __streambuf_type *  __sb  ) 

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 155 of file istream.tcc.

References std::__copy_streambufs_eof(), std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( void *&  __p  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 226 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( long double &  __f  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 222 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( double &  __f  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 218 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( float &  __f  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 214 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( unsigned long long &  __n  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 209 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( long long &  __n  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 205 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( unsigned long &  __n  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 200 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( long &  __n  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 196 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( unsigned int &  __n  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 192 of file istream.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::operator>> ( int &  __n  ) 

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 135 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_extract(), std::ios_base::failbit, and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( unsigned short &  __n  )  [inline]

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 185 of file istream.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::operator>> ( short &  __n  ) 

Extracting into 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 this stream and inserted into the sb streambuf until one of the following occurs:

If the function inserts no characters, failbit is set.

Definition at line 115 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_extract(), std::ios_base::failbit, and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( bool &  __n  )  [inline]

Basic arithmetic extractors.

Parameters:
A variable of builtin type.
Returns:
*this if successful
These functions use the stream's current locale (specifically, the num_get facet) to parse the input data.

Definition at line 178 of file istream.

template<typename _CharT, typename _Traits>
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> ( __istream_type &(*)(__istream_type &)  __pf  )  [inline]

Interface for manipulators.

Manuipulators such as std::ws and std::dec use these functions in constructs like "std::cin >> std::ws". For more information, see the iomanip header.

Definition at line 131 of file istream.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits >::int_type std::basic_istream< _CharT, _Traits >::peek (  ) 

Looking ahead in the stream.

Returns:
The next character, or eof().
If, after constructing the sentry object, good() is false, returns traits::eof(). Otherwise reads but does not extract the next input character.

Definition at line 523 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().

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 626 of file ios_base.h.

streamsize std::ios_base::precision (  )  const [inline, inherited]

Flags access.

Returns:
The precision to generate on certain output operations.

Definition at line 618 of file ios_base.h.

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

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::putback ( char_type  __c  ) 

Unextracting a single character.

Parameters:
c The character to push back into the input stream.
Returns:
*this
If rdbuf() is not null, calls rdbuf()->sputbackc(c).

If rdbuf() is null or if sputbackc() fails, sets badbit in the error state.

Note:
Since no characters are extracted, the next call to gcount() will return 0, as required by DR 60.

Definition at line 599 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_streambuf< _CharT, _Traits >::sputbackc().

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 755 of file ios_base.h.

References std::ios_base::_Words::_M_pword.

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 57 of file basic_ios.tcc.

References std::basic_ios< _CharT, _Traits >::_M_streambuf, and std::basic_ios< _CharT, _Traits >::clear().

template<typename _CharT, typename _Traits>
basic_streambuf<_CharT, _Traits>* std::basic_ios< _CharT, _Traits >::rdbuf (  )  const [inline, inherited]

Accessing the underlying buffer.

Returns:
The current stream buffer.
This does not change the state of the stream.

Reimplemented in std::basic_ifstream< _CharT, _Traits >, std::basic_ofstream< _CharT, _Traits >, std::basic_fstream< _CharT, _Traits >, std::basic_istringstream< _CharT, _Traits, _Alloc >, std::basic_ostringstream< _CharT, _Traits, _Alloc >, and std::basic_stringstream< _CharT, _Traits, _Alloc >.

Definition at line 307 of file basic_ios.h.

Referenced by std::__ostream_fill(), std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::getline(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::sync(), std::basic_istream< _CharT, _Traits >::unget(), and std::ws().

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 123 of file basic_ios.h.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::read ( char_type *  __s,
streamsize  __n 
)

Extraction without delimiters.

Parameters:
s A character array.
n Maximum number of characters to store.
Returns:
*this
If the stream state is good(), extracts characters and stores them into s until one of the following happens:

Note:
This function is not overloaded on signed char and unsigned char.

Definition at line 548 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
streamsize std::basic_istream< _CharT, _Traits >::readsome ( char_type *  __s,
streamsize  __n 
)

Extraction until the buffer is exhausted, but no more.

Parameters:
s A character array.
n Maximum number of characters to store.
Returns:
The number of characters extracted.
Extracts characters and stores them into s depending on the number of characters remaining in the streambuf's buffer, rdbuf()->in_avail(), called A here:

The goal is to empty the current buffer, and to not request any more from the external input sequence controlled by the streambuf.

Definition at line 572 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::goodbit, std::min(), std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().

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_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::seekg ( off_type  ,
ios_base::seekdir   
)

Changing the current read 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.

Note:
This function does not count the number of characters extracted, if any, and therefore does not affect the next call to gcount().

Definition at line 733 of file istream.tcc.

References std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::failbit, std::ios_base::goodbit, std::ios_base::in, and std::basic_ios< _CharT, _Traits >::setstate().

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::seekg ( pos_type   ) 

Changing the current read position.

Parameters:
pos A file position object.
Returns:
*this
If fail() is not true, calls rdbuf()->pubseekpos(pos). If that function fails, sets failbit.

Note:
This function does not count the number of characters extracted, if any, and therefore does not affect the next call to gcount().

Definition at line 705 of file istream.tcc.

References std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::failbit, std::ios_base::goodbit, std::ios_base::in, and std::basic_ios< _CharT, _Traits >::setstate().

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 591 of file ios_base.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 574 of file ios_base.h.

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

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 143 of file basic_ios.h.

Referenced by std::__ostream_fill(), std::basic_istream< _CharT, _Traits >::_M_extract(), std::basic_ostream< _CharT, _Traits >::_M_insert(), std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::getline(), 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::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::sync(), std::basic_istream< _CharT, _Traits >::unget(), and std::ws().

template<typename _CharT, typename _Traits>
int std::basic_istream< _CharT, _Traits >::sync (  ) 

Synchronizing the stream buffer.

Returns:
0 on success, -1 on failure
If rdbuf() is a null pointer, returns -1.

Otherwise, calls rdbuf()->pubsync(), and if that returns -1, sets badbit and returns -1.

Otherwise, returns 0.

Note:
This function does not count the number of characters extracted, if any, and therefore does not affect the next call to gcount().

Definition at line 655 of file istream.tcc.

References std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::goodbit, std::basic_streambuf< _CharT, _Traits >::pubsync(), std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().

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 http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#8 for more.

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits >::pos_type std::basic_istream< _CharT, _Traits >::tellg (  ) 

Getting the current read position.

Returns:
A file position object.
If fail() is not false, returns pos_type(-1) to indicate failure. Otherwise returns rdbuf()->pubseekoff(0,cur,in).

Note:
This function does not count the number of characters extracted, if any, and therefore does not affect the next call to gcount().

Definition at line 686 of file istream.tcc.

References std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::cur, and std::ios_base::in.

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 293 of file basic_ios.h.

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 281 of file basic_ios.h.

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

template<typename _CharT, typename _Traits>
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::unget (  ) 

Unextracting the previous character.

Returns:
*this
If rdbuf() is not null, calls rdbuf()->sungetc(c).

If rdbuf() is null or if sungetc() fails, sets badbit in the error state.

Note:
Since no characters are extracted, the next call to gcount() will return 0, as required by DR 60.

Definition at line 627 of file istream.tcc.

References std::basic_istream< _CharT, _Traits >::_M_gcount, std::basic_ios< _CharT, _Traits >::_M_setstate(), std::ios_base::badbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_streambuf< _CharT, _Traits >::sungetc().

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 606 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>
_CharT std::basic_ios< _CharT, _Traits >::widen ( char  __c  )  const [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++/22_locale/howto.html

Definition at line 122 of file basic_ios.tcc.

References std::__check_facet(), and std::basic_ios< _CharT, _Traits >::_M_ctype.

Referenced by std::endl(), std::getline(), and std::operator>>().

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 648 of file ios_base.h.

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 640 of file ios_base.h.

Referenced by std::__ostream_insert(), std::money_put< _CharT, _OutIter >::_M_insert(), std::num_put< _CharT, _OutIter >::_M_insert_float(), std::num_put< _CharT, _OutIter >::_M_insert_int(), std::basic_ios< _CharT, _Traits >::copyfmt(), std::num_put< _CharT, _OutIter >::do_put(), __gnu_cxx::operator<<(), std::operator<<(), and std::operator>>().

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

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 308 of file ios_base.h.

Referenced by std::money_put< _CharT, _OutIter >::_M_insert(), and std::__pad< _CharT, _Traits >::_S_pad().

const openmode std::ios_base::app [static, inherited]

Seek to end before each write.

Definition at line 362 of file ios_base.h.

const openmode std::ios_base::ate [static, inherited]

Open and seek to end immediately after opening.

Definition at line 365 of file ios_base.h.

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

const iostate std::ios_base::badbit [static, inherited]

as an irrecoverable read error from a file).

Definition at line 332 of file ios_base.h.

Referenced by std::basic_istream< _CharT, _Traits >::_M_extract(), std::basic_ostream< _CharT, _Traits >::_M_insert(), std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::getline(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_ios< _CharT, _Traits >::init(), std::operator<<(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::sync(), std::basic_istream< _CharT, _Traits >::tellg(), std::basic_ostream< _CharT, _Traits >::tellp(), std::basic_istream< _CharT, _Traits >::unget(), and std::basic_ostream< _CharT, _Traits >::write().

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 311 of file ios_base.h.

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

const seekdir std::ios_base::beg [static, inherited]

Request a seek relative to the beginning of the stream.

Definition at line 395 of file ios_base.h.

Referenced by __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::seekoff(), __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::seekpos(), and std::basic_filebuf< _CharT, _Traits >::seekpos().

const openmode std::ios_base::binary [static, inherited]

http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7 for more.

Definition at line 371 of file ios_base.h.

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

const fmtflags std::ios_base::boolalpha [static, inherited]

Insert/extract bool in alphabetic rather than numeric format.

Definition at line 256 of file ios_base.h.

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

const seekdir std::ios_base::cur [static, inherited]

Request a seek relative to the current position within the sequence.

Definition at line 398 of file ios_base.h.

Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_istream< _CharT, _Traits >::tellg(), and std::basic_ostream< _CharT, _Traits >::tellp().

const fmtflags std::ios_base::dec [static, inherited]

Converts integer input or generates integer output in decimal base.

Definition at line 259 of file ios_base.h.

const seekdir std::ios_base::end [static, inherited]

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

Definition at line 401 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 335 of file ios_base.h.

Referenced by std::money_get< _CharT, _InIter >::_M_extract(), std::num_get< _CharT, _InIter >::_M_extract_float(), std::num_get< _CharT, _InIter >::_M_extract_int(), 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_istream< _CharT, _Traits >::get(), std::getline(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits >::operator>>(), std::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), and std::ws().

const iostate std::ios_base::failbit [static, inherited]

desired characters.

Definition at line 340 of file ios_base.h.

Referenced by std::money_get< _CharT, _InIter >::_M_extract(), std::num_get< _CharT, _InIter >::_M_extract_float(), std::num_get< _CharT, _InIter >::_M_extract_int(), std::time_get< _CharT, _InIter >::_M_extract_name(), std::time_get< _CharT, _InIter >::_M_extract_num(), std::time_get< _CharT, _InIter >::_M_extract_via_format(), 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_istream< _CharT, _Traits >::get(), std::getline(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::basic_istream< _CharT, _Traits >::operator>>(), std::operator>>(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::seekg(), and std::basic_ostream< _CharT, _Traits >::seekp().

const fmtflags std::ios_base::fixed [static, inherited]

Generate floating-point output in fixed-point notation.

Definition at line 262 of file ios_base.h.

Referenced by std::num_put< _CharT, _OutIter >::_M_insert_float().

const fmtflags std::ios_base::floatfield [static, inherited]

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

Definition at line 314 of file ios_base.h.

const iostate std::ios_base::goodbit [static, inherited]

Indicates all is well.

Definition at line 343 of file ios_base.h.

Referenced by std::basic_istream< _CharT, _Traits >::_M_extract(), std::time_get< _CharT, _InIter >::_M_extract_via_format(), std::basic_ostream< _CharT, _Traits >::_M_insert(), std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_weekday(), std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::getline(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_ios< _CharT, _Traits >::init(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::basic_istream< _CharT, _Traits >::operator>>(), std::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::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 265 of file ios_base.h.

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

const openmode std::ios_base::in [static, inherited]

Open for input. Default for ifstream and fstream.

Definition at line 374 of file ios_base.h.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_sync(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_istream< _CharT, _Traits >::tellg(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().

const fmtflags std::ios_base::internal [static, inherited]

designated.

Definition at line 270 of file ios_base.h.

Referenced by std::money_put< _CharT, _OutIter >::_M_insert(), std::__pad< _CharT, _Traits >::_S_pad(), and std::num_put< _CharT, _OutIter >::do_put().

const fmtflags std::ios_base::left [static, inherited]

generated output. (I.e., the thing you print is flush left.)

Definition at line 274 of file ios_base.h.

Referenced by std::money_put< _CharT, _OutIter >::_M_insert(), std::__pad< _CharT, _Traits >::_S_pad(), and __gnu_cxx::operator<<().

const fmtflags std::ios_base::oct [static, inherited]

Converts integer input or generates integer output in octal base.

Definition at line 277 of file ios_base.h.

Referenced by std::__int_to_char(), std::num_get< _CharT, _InIter >::_M_extract_int(), std::num_put< _CharT, _OutIter >::_M_insert_int(), and std::basic_ostream< _CharT, _Traits >::operator<<().

const openmode std::ios_base::out [static, inherited]

Open for output. Default for ofstream and fstream.

Definition at line 377 of file ios_base.h.

Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::_M_sync(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_ostream< _CharT, _Traits >::tellp(), and std::basic_filebuf< _CharT, _Traits >::xsputn().

const fmtflags std::ios_base::right [static, inherited]

generated output. (I.e., the thing you print is flush right.)

Definition at line 281 of file ios_base.h.

const fmtflags std::ios_base::scientific [static, inherited]

Generates floating-point output in scientific notation.

Definition at line 284 of file ios_base.h.

const fmtflags std::ios_base::showbase [static, inherited]

output.

Definition at line 288 of file ios_base.h.

Referenced by std::money_get< _CharT, _InIter >::_M_extract(), std::money_put< _CharT, _OutIter >::_M_insert(), std::num_put< _CharT, _OutIter >::_M_insert_int(), and std::num_put< _CharT, _OutIter >::do_put().

const fmtflags std::ios_base::showpoint [static, inherited]

floating-point output.

Definition at line 292 of file ios_base.h.

const fmtflags std::ios_base::showpos [static, inherited]

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

Definition at line 295 of file ios_base.h.

Referenced by std::num_put< _CharT, _OutIter >::_M_insert_int().

const fmtflags std::ios_base::skipws [static, inherited]

Skips leading white space before certain input operations.

Definition at line 298 of file ios_base.h.

const openmode std::ios_base::trunc [static, inherited]

Open for input. Default for ofstream.

Definition at line 380 of file ios_base.h.

const fmtflags std::ios_base::unitbuf [static, inherited]

Flushes output after each output operation.

Definition at line 301 of file ios_base.h.

const fmtflags std::ios_base::uppercase [static, inherited]

in generated output.

Definition at line 305 of file ios_base.h.

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

The documentation for this class was generated from the following files:
Generated on Thu Nov 1 13:17:23 2007 for libstdc++ by  doxygen 1.5.1