std::ios_base(3)

NAME
std::ios_base - The very top of the I/O class hierarchy.

SYNOPSIS

#include <MAYBE_AN_ERROR_MESSAGE_HERE>

Inherited by std::basic_ios< _CharT, _Traits >, and std::basic_ios< char, _Traits >.

  Public Types
typedef _Ios_Fmtflags fmtflags
This is a bitmask type.
typedef _Ios_Iostate iostate
This is a bitmask type.
typedef _Ios_Openmode openmode
This is a bitmask type.
typedef _Ios_Seekdir seekdir
This is an enumerated type.
typedef void(* event_callback )(event, ios_base &, int)
enum event

  Public Member Functions
void register_callback (event_callback __fn, int __index)
fmtflags flags () const
Access to format flags.
fmtflags flags (fmtflags __fmtfl)
Setting new format flags all at once.
fmtflags setf (fmtflags __fmtfl)
Setting new format flags.
fmtflags setf (fmtflags __fmtfl, fmtflags __mask)
Setting new format flags.
void unsetf (fmtflags __mask)
Clearing format flags.
streamsize precision () const
Flags access.
streamsize precision (streamsize __prec)
Changing flags.
streamsize width () const
Flags access.
streamsize width (streamsize __wide)
Changing flags.
locale imbue (const locale &__loc)
Setting a new locale.
locale getloc () const
Locale access.
long & iword (int __ix)
void *& pword (int __ix)
~ios_base ()

  Static Public Member Functions
bool sync_with_stdio (bool __sync=true)
Interaction with the standard C I/O objects.
int xalloc () throw ()

  Static Public Attributes
const fmtflags boolalpha
Insert/extract bool in alphabetic rather than numeric format.
const fmtflags dec
Converts integer input or generates integer output in decimal base.
const fmtflags fixed
Generate floating-point output in fixed-point notation.
const fmtflags hex
Converts integer input or generates integer output in hexadecimal base.
const fmtflags internal
Adds fill characters at a designated internal point in certain generated output, or identical to right if no such point is designated.
const fmtflags left
Adds fill characters on the right (final positions) of certain generated output. (I.e., the thing you print is flush left.).
const fmtflags oct
Converts integer input or generates integer output in octal base.
const fmtflags right
Adds fill characters on the left (initial positions) of certain generated output. (I.e., the thing you print is flush right.).
const fmtflags scientific
Generates floating-point output in scientific notation.
const fmtflags showbase
Generates a prefix indicating the numeric base of generated integer output.
const fmtflags showpoint
Generates a decimal-point character unconditionally in generated floating-point output.
const fmtflags showpos
Generates a + sign in non-negative generated numeric output.
const fmtflags skipws
Skips leading white space before certain input operations.
const fmtflags unitbuf
Flushes output after each output operation.
const fmtflags uppercase
Replaces certain lowercase letters with their uppercase equivalents in generated output.
const fmtflags adjustfield
A mask of left|right|internal. Useful for the 2-arg form of setf.
const fmtflags basefield
A mask of dec|oct|hex. Useful for the 2-arg form of setf.
const fmtflags floatfield
A mask of scientific|fixed. Useful for the 2-arg form of setf.
const iostate badbit
Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file).
const iostate eofbit
Indicates that an input operation reached the end of an input sequence.
const iostate failbit
Indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters.
const iostate goodbit
Indicates all is well.
const openmode app
Seek to end before each write.
const openmode ate
Open and seek to end immediately after opening.
const openmode binary
Perform input and output in binary mode (as opposed to text mode). This is probably not what you think it is; see http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#3 and http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7 for more.
const openmode in
Open for input. Default for ifstream and fstream.
const openmode out
Open for output. Default for ofstream and fstream.
const openmode trunc
Open for input. Default for ofstream.
const seekdir beg
Request a seek relative to the beginning of the stream.
const seekdir cur
Request a seek relative to the current position within the sequence.
const seekdir end
Request a seek relative to the current end of the sequence.

Detailed Description

The very top of the I/O class hierarchy. This class defines everything that can be defined about I/O that does not depend on the type of characters being input or output. Most people will only see ios_base when they need to specify the full name of the various I/O flags (e.g., the openmodes).

Definition at line 160 of file MAYBE_AN_ERROR_MESSAGE_HERE.

Member Typedef Documentation

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

Todo
    Doc me! See docs/doxygen/TODO and http://gcc.gnu.org/ml/libstdc++/2002-02/msg00003.html for more.

Definition at line 357 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  typedef _Ios_Fmtflags std::ios_base::fmtflags

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 214 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  typedef _Ios_Iostate std::ios_base::iostate

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 271 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  typedef _Ios_Openmode std::ios_base::openmode

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 298 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  typedef _Ios_Seekdir std::ios_base::seekdir

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 325 of file MAYBE_AN_ERROR_MESSAGE_HERE.

Member Enumeration Documentation

  enum std::ios_base::event

Todo
    Doc me! See docs/doxygen/TODO and http://gcc.gnu.org/ml/libstdc++/2002-02/msg00003.html for more.

Definition at line 347 of file MAYBE_AN_ERROR_MESSAGE_HERE.

Constructor & Destructor Documentation

  std::ios_base::~ios_base ()

Destroys local storage and [XXX does something with callbacks].

Definition at line 329 of file ios.cc.

Member Function Documentation

  fmtflags std::ios_base::flags (fmtflags __fmtfl) [inline]

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 484 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  fmtflags std::ios_base::flags () const [inline]

Access to format flags.Returns:
    The format control flags for both input and output.

Definition at line 474 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

  locale std::ios_base::getloc () const [inline]

Locale access.Returns:
    The locale currently in effect.

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 616 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

  locale std::ios_base::imbue (const locale & __loc)

Setting a new locale.Parameters:
    loc The new locale.

Returns:
    The previous locale.

Sets the new locale for this stream, and [XXX does something with callbacks]. Reimplemented in std::basic_ios< _CharT, _Traits >, and std::basic_ios< char, _Traits >.

Definition at line 312 of file ios.cc.

  long& std::ios_base::iword (int __ix) [inline]

Todo
    Doc me! See docs/doxygen/TODO and http://gcc.gnu.org/ml/libstdc++/2002-02/msg00003.html for more.

Definition at line 629 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  streamsize std::ios_base::precision (streamsize __prec) [inline]

Changing flags.Parameters:
    prec The new precision value.

Returns:
    The previous value of precision().

Definition at line 552 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

Flags access.Returns:
    The precision to generate on certain output operations.

Definition at line 544 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

  void*& std::ios_base::pword (int __ix) [inline]

Todo
    Doc me! See docs/doxygen/TODO and http://gcc.gnu.org/ml/libstdc++/2002-02/msg00003.html for more.

Definition at line 640 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  void std::ios_base::register_callback (event_callback __fn, int __index)

Todo
    Doc me! See docs/doxygen/TODO and http://gcc.gnu.org/ml/libstdc++/2002-02/msg00003.html for more.

Definition at line 341 of file ios.cc.

  fmtflags std::ios_base::setf (fmtflags __fmtfl, fmtflags __mask) [inline]

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 517 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  fmtflags std::ios_base::setf (fmtflags __fmtfl) [inline]

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 500 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

  bool std::ios_base::sync_with_stdio (bool __sync = true) [static]

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.

Definition at line 372 of file ios.cc.

  void std::ios_base::unsetf (fmtflags __mask) [inline]

Clearing format flags.Parameters:
    mask The flags to unset.

This function clears mask in the format flags.

Definition at line 532 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

  streamsize std::ios_base::width (streamsize __wide) [inline]

Changing flags.Parameters:
    wide The new width value.

Returns:
    The previous value of width().

Definition at line 574 of file MAYBE_AN_ERROR_MESSAGE_HERE.

  streamsize std::ios_base::width () const [inline]

Flags access.Returns:
    The minimum field width to generate on output operations.

Definition at line 566 of file MAYBE_AN_ERROR_MESSAGE_HERE.

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

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

Todo
    Doc me! See docs/doxygen/TODO and http://gcc.gnu.org/ml/libstdc++/2002-02/msg00003.html for more.

Definition at line 249 of file ios.cc.

Member Data Documentation

  const ios_base::fmtflags std::ios_base::adjustfield [static]

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

Definition at line 130 of file ios.cc.

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

Seek to end before each write.

Definition at line 139 of file ios.cc.

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

Open and seek to end immediately after opening.

Definition at line 140 of file ios.cc.

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

Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file).

Definition at line 134 of file ios.cc.

Referenced by std::basic_ios< char, _Traits >::bad(), std::basic_ios< _CharT, _Traits >::clear(), std::basic_ios< char, _Traits >::fail(), and std::basic_ios< _CharT, _Traits >::init().

  const ios_base::fmtflags std::ios_base::basefield [static]

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

Definition at line 131 of file ios.cc.

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

Request a seek relative to the beginning of the stream.

Definition at line 146 of file ios.cc.

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

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++/27_io/howto.html#3 and http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7 for more.

Definition at line 141 of file ios.cc.

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

Insert/extract bool in alphabetic rather than numeric format.

Definition at line 115 of file ios.cc.

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

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

Definition at line 147 of file ios.cc.

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

Converts integer input or generates integer output in decimal base.

Definition at line 116 of file ios.cc.

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

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

Definition at line 148 of file ios.cc.

  const ios_base::iostate std::ios_base::eofbit [static]

Indicates that an input operation reached the end of an input sequence.

Definition at line 135 of file ios.cc.

Referenced by std::basic_ios< char, _Traits >::eof().

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

Indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters.

Definition at line 136 of file ios.cc.

Referenced by std::basic_ios< char, _Traits >::fail().

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

Generate floating-point output in fixed-point notation.

Definition at line 117 of file ios.cc.

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

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

Definition at line 132 of file ios.cc.

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

Indicates all is well.

Definition at line 137 of file ios.cc.

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

  const ios_base::fmtflags std::ios_base::hex [static]

Converts integer input or generates integer output in hexadecimal base.

Definition at line 118 of file ios.cc.

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

Open for input. Default for ifstream and fstream.

Definition at line 142 of file ios.cc.

Referenced by std::basic_istringstream< _CharT, _Traits, _Alloc >::basic_istringstream().

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

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 119 of file ios.cc.

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

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

Definition at line 120 of file ios.cc.

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

Converts integer input or generates integer output in octal base.

Definition at line 121 of file ios.cc.

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

Open for output. Default for ofstream and fstream.

Definition at line 143 of file ios.cc.

Referenced by std::basic_ostringstream< _CharT, _Traits, _Alloc >::basic_ostringstream().

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

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

Definition at line 122 of file ios.cc.

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

Generates floating-point output in scientific notation.

Definition at line 123 of file ios.cc.

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

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

Definition at line 124 of file ios.cc.

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

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

Definition at line 125 of file ios.cc.

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

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

Definition at line 126 of file ios.cc.

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

Skips leading white space before certain input operations.

Definition at line 127 of file ios.cc.

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

Open for input. Default for ofstream.

Definition at line 144 of file ios.cc.

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

Flushes output after each output operation.

Definition at line 128 of file ios.cc.

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

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

Definition at line 129 of file ios.cc.

Author

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