Provided by: libstdc++-13-doc_13.2.0-23ubuntu4_all bug

NAME

       std::basic_ios< _CharT, _Traits > - Template class basic_ios, virtual base class for all
       stream classes.

SYNOPSIS

       #include <ios>

       Inherits std::ios_base.

       Inherited by std::basic_istream< char > [virtual], std::basic_istream< char, _Traits >
       [virtual], std::basic_istream< _CharT, char_traits< _CharT > > [virtual],
       std::basic_ostream< char, _Traits > [virtual], std::basic_ostream< char > [virtual],
       std::basic_ostream< _CharT, char_traits< _CharT > > [virtual], std::basic_istream< _CharT,
       _Traits > [virtual], and std::basic_ostream< _CharT, _Traits > [virtual].

   Public Types
       enum event { erase_event, imbue_event, copyfmt_event }
           The set of events that may be passed to an event callback.
       typedef void(* event_callback) (event __e, ios_base &__b, int __i)
           The type of an event callback function.
       typedef _Ios_Fmtflags fmtflags
           This is a bitmask type.
       typedef _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 _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)
           Constructor performs initialization.
       virtual ~basic_ios ()
           Empty.
       const locale & _M_getloc () const
           Locale access.
       void _M_setstate (iostate __state)
       bool bad () const
           Fast error checking.
       void clear (iostate __state=goodbit)
           [Re]sets the error state.
       basic_ios & copyfmt (const basic_ios &__rhs)
           Copies fields of __rhs into this.
       bool eof () const
           Fast error checking.
       iostate exceptions () const
           Throwing exceptions on errors.
       void exceptions (iostate __except)
           Throwing exceptions on errors.
       bool fail () const
           Fast error checking.
       char_type fill () const
           Retrieves the empty character.
       char_type fill (char_type __ch)
           Sets a new empty character.
       fmtflags flags () const
           Access to format flags.
       fmtflags flags (fmtflags __fmtfl)
           Setting new format flags all at once.
       locale getloc () const
           Locale access.
       bool good () const
           Fast error checking.
       locale imbue (const locale &__loc)
           Moves to a new locale.
       long & iword (int __ix)
           Access to integer array.
       char narrow (char_type __c, char __dfault) const
           Squeezes characters.
       streamsize precision () const
           Flags access.
       streamsize precision (streamsize __prec)
           Changing flags.
       void *& pword (int __ix)
           Access to void pointer array.
       basic_streambuf< _CharT, _Traits > * rdbuf () const
           Accessing the underlying buffer.
       basic_streambuf< _CharT, _Traits > * rdbuf (basic_streambuf< _CharT, _Traits > *__sb)
           Changing the underlying buffer.
       iostate rdstate () const
           Returns the error state of the stream buffer.
       void register_callback (event_callback __fn, int __index)
           Add the callback __fn with parameter __index.
       fmtflags setf (fmtflags __fmtfl)
           Setting new format flags.
       fmtflags setf (fmtflags __fmtfl, fmtflags __mask)
           Setting new format flags.
       void setstate (iostate __state)
           Sets additional flags in the error state.
       basic_ostream< _CharT, _Traits > * tie () const
           Fetches the current tied stream.
       basic_ostream< _CharT, _Traits > * tie (basic_ostream< _CharT, _Traits > *__tiestr)
           Ties this stream to an output stream.
       void unsetf (fmtflags __mask)
           Clearing format flags.
       char_type widen (char __c) const
           Widens characters.
       streamsize width () const
           Flags access.
       streamsize width (streamsize __wide)
           Changing flags.

           operator bool () const
               The quick-and-easy status check.
           bool operator! () const
               The quick-and-easy status check.

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

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

   Protected Types
       enum { _S_local_word_size }

   Protected Member Functions
       basic_ios ()
           Empty.
       basic_ios (const basic_ios &)=delete
       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 _M_move (ios_base &) noexcept
       void _M_swap (ios_base &__rhs) noexcept
       void init (basic_streambuf< _CharT, _Traits > *__sb)
           All setup is performed here.
       void move (basic_ios &&__rhs)
       void move (basic_ios &__rhs)
       basic_ios & operator= (const basic_ios &)=delete
       void set_rdbuf (basic_streambuf< _CharT, _Traits > *__sb)
       void swap (basic_ios &__rhs) noexcept

   Protected Attributes
       _Callback_list * _M_callbacks
       const __ctype_type * _M_ctype
       iostate _M_exception
       char_type _M_fill
       bool _M_fill_init
       fmtflags _M_flags
       locale _M_ios_locale
       _Words _M_local_word [_S_local_word_size]
       const __num_get_type * _M_num_get
       const __num_put_type * _M_num_put
       streamsize _M_precision
       basic_streambuf< _CharT, _Traits > * _M_streambuf
       iostate _M_streambuf_state
       basic_ostream< _CharT, _Traits > * _M_tie
       streamsize _M_width
       _Words * _M_word
       int _M_word_size
       _Words _M_word_zero

Detailed Description

   template<typename _CharT, typename _Traits>
       class std::basic_ios< _CharT, _Traits >"Template class basic_ios, virtual base class for
       all stream classes.

       Template Parameters
           _CharT Type of character stream.
           _Traits Traits 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.

Member Typedef Documentation

   template<typename _CharT , typename _Traits > typedef ctype<_CharT> std::basic_ios< _CharT,
       _Traits >::__ctype_type
       These are non-standard types.

   template<typename _CharT , typename _Traits > typedef num_get<_CharT,
       istreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_get_type
       These are non-standard types.

   template<typename _CharT , typename _Traits > typedef num_put<_CharT,
       ostreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_put_type
       These are non-standard types.

   template<typename _CharT , typename _Traits > 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.

   typedef void(* std::ios_base::event_callback) (event __e, ios_base &__b, int __i) [inherited]
       The type of an event callback function.

       Parameters
           __e One of the members of the event enum.
           __b Reference to the ios_base object.
           __i The integer provided when the callback was registered.

       Event callbacks are user defined functions that get called during several ios_base and
       basic_ios functions, specifically imbue(), copyfmt(), and ~ios().

   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

   template<typename _CharT , typename _Traits > 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.

   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

   template<typename _CharT , typename _Traits > 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.

   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

   template<typename _CharT , typename _Traits > 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.

   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.

   template<typename _CharT , typename _Traits > 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.

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().

Constructor & Destructor Documentation

   template<typename _CharT , typename _Traits > std::basic_ios< _CharT, _Traits >::basic_ios
       (basic_streambuf< _CharT, _Traits > * __sb) [inline],  [explicit]
       Constructor performs initialization. The parameter is passed by derived streams.

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

   template<typename _CharT , typename _Traits > virtual std::basic_ios< _CharT, _Traits
       >::~basic_ios () [inline],  [virtual]
       Empty. The destructor does nothing. More specifically, it does not destroy the streambuf
       held by rdbuf().

   template<typename _CharT , typename _Traits > std::basic_ios< _CharT, _Traits >::basic_ios ()
       [inline],  [protected]
       Empty. The default constructor does nothing and is not normally accessible to users.

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.

   template<typename _CharT , typename _Traits > 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.

       References std::ios_base::badbit, and std::basic_ios< _CharT, _Traits >::rdstate().

   template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::clear
       (iostate __state = goodbit)
       [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.

       Referenced by std::basic_ios< _CharT, _Traits >::exceptions(), std::basic_istream< _CharT,
       _Traits >::putback(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_istream<
       _CharT, _Traits >::seekg(), std::basic_ios< _CharT, _Traits >::setstate(), and
       std::basic_istream< _CharT, _Traits >::unget().

   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
           __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().

       References std::__addressof(), std::basic_ios< _CharT, _Traits >::tie(), and std::tie().

   template<typename _CharT , typename _Traits > 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.

       References std::ios_base::eofbit, and std::basic_ios< _CharT, _Traits >::rdstate().

   template<typename _CharT , typename _Traits > iostate std::basic_ios< _CharT, _Traits
       >::exceptions () const [inline]
       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.

   template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits
       >::exceptions (iostate __except) [inline]
       Throwing exceptions on errors.

       Parameters
           __except The new exceptions mask.

       By default, error flags are set silently. You can set an exceptions mask for each stream;
       if a bit in the mask becomes set in the error flags, then an exception of type
       std::ios_base::failure is thrown.

       If the error flag is already set when the exceptions mask is added, the exception is
       immediately thrown. Try running the following under GCC 3.1 or later:

       #include <iostream>
       #include <fstream>
       #include <exception>

       int main()
       {
           std::set_terminate (__gnu_cxx::__verbose_terminate_handler);

           std::ifstream f ("/etc/motd");

           std::cerr << "Setting badbit\n";
           f.setstate (std::ios_base::badbit);

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

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

   template<typename _CharT , typename _Traits > 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.

       References std::ios_base::badbit, std::ios_base::failbit, and std::basic_ios< _CharT,
       _Traits >::rdstate().

       Referenced by std::basic_ios< _CharT, _Traits >::operator bool(), std::basic_ios< _CharT,
       _Traits >::operator!(), std::basic_istream< _CharT, _Traits >::seekg(),
       std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits
       >::seekp(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT,
       _Traits >::tellg(), and std::basic_ostream< _CharT, _Traits >::tellp().

   template<typename _CharT , typename _Traits > 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.

       References std::basic_ios< _CharT, _Traits >::widen().

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

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

       References std::basic_ios< _CharT, _Traits >::fill().

   fmtflags std::ios_base::flags () const [inline],  [inherited]
       Access to format flags.

       Returns
           The format control flags for both input and output.

   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.

   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.

   template<typename _CharT , typename _Traits > bool std::basic_ios< _CharT, _Traits >::good ()
       const [inline]
       Fast error checking.

       Returns
           True if no error flags are set.

       A wrapper around rdstate.

       References std::basic_ios< _CharT, _Traits >::rdstate().

   template<typename _CharT , typename _Traits > locale std::basic_ios< _CharT, _Traits >::imbue
       (const locale & __loc)
       Moves to a new locale.

       Parameters
           __loc The new locale.

       Returns
           The previous locale.

       Calls ios_base::imbue(loc), and if a stream buffer is associated with this stream, calls
       that buffer's pubimbue(loc).

       Additional l10n notes are at
       http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html

       References std::ios_base::imbue().

   template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::init
       (basic_streambuf< _CharT, _Traits > * __sb) [protected]
       All setup is performed here. This is called from the public constructor. It is not virtual
       and cannot be redefined.

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

   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.

   template<typename _CharT , typename _Traits > char std::basic_ios< _CharT, _Traits >::narrow
       (char_type __c, char __dfault) const [inline]
       Squeezes characters.

       Parameters
           __c The character to narrow.
           __dfault The character to narrow.

       Returns
           The narrowed character.

       Maps a character of char_type to a character of char, if possible.

       Returns the result of

       std::use_facet<ctype<char_type> >(getloc()).narrow(c,dfault)

       Additional l10n notes are at
       http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html

   template<typename _CharT , typename _Traits > std::basic_ios< _CharT, _Traits >::operator bool
       () const [inline],  [explicit]
       The quick-and-easy status check. This allows you to write constructs such as if
       (!a_stream) ... and while (a_stream) ...

       References std::basic_ios< _CharT, _Traits >::fail().

   template<typename _CharT , typename _Traits > 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) ...

       References std::basic_ios< _CharT, _Traits >::fail().

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

       Returns
           The precision to generate on certain output operations.

       Be careful if you try to give a definition of precision here; see DR 189.

   streamsize std::ios_base::precision (streamsize __prec) [inline],  [inherited]
       Changing flags.

       Parameters
           __prec The new precision value.

       Returns
           The previous value of precision().

   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.

   template<typename _CharT , typename _Traits > basic_streambuf< _CharT, _Traits > *
       std::basic_ios< _CharT, _Traits >::rdbuf () const [inline]
       Accessing the underlying buffer.

       Returns
           The current stream buffer.

       This does not change the state of the stream.

       Referenced by std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT,
       _Traits >::get(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream<
       _CharT, _Traits >::get(), std::basic_istream< char >::get(), std::basic_istream< _CharT,
       _Traits >::ignore(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream<
       _CharT, _Traits >::operator>>(), std::basic_ostream< _CharT, _Traits >::put(),
       std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits
       >::read(), std::basic_istream< char >::readsome(), std::basic_istream< _CharT, _Traits
       >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_istream< _CharT,
       _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_ostream<
       _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::sync(),
       std::basic_istream< _CharT, _Traits >::tellg(), and std::basic_ostream< _CharT, _Traits
       >::tellp().

   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
           __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>

   template<typename _CharT , typename _Traits > 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().

       Referenced by std::basic_ios< _CharT, _Traits >::bad(), std::basic_ios< _CharT, _Traits
       >::eof(), std::basic_ios< _CharT, _Traits >::fail(), std::basic_ios< _CharT, _Traits
       >::good(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT,
       _Traits >::seekg(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ios<
       _CharT, _Traits >::setstate(), and std::basic_istream< _CharT, _Traits >::unget().

   void std::ios_base::register_callback (event_callback __fn, int __index) [inherited]
       Add the callback __fn with parameter __index.

       Parameters
           __fn The function to add.
           __index The integer to pass to the function when invoked.

       Registers a function as an event callback with an integer parameter to be passed to the
       function when invoked. Multiple copies of the function are allowed. If there are multiple
       callbacks, they are invoked in the order they were registered.

   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.

   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.

   template<typename _CharT , typename _Traits > void std::basic_ios< _CharT, _Traits >::setstate
       (iostate __state) [inline]
       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.

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

       Referenced by std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT,
       _Traits >::get(), std::basic_istream< _CharT, _Traits >::get(), std::basic_ostream<
       _CharT, _Traits >::operator<<(), std::basic_istream< _CharT, _Traits >::operator>>(),
       std::basic_istream< _CharT, _Traits >::operator>>(), 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_istream<
       _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(),
       std::basic_ostream< _CharT, _Traits >::seekp(), and std::basic_istream< _CharT, _Traits
       >::sync().

   static bool std::ios_base::sync_with_stdio (bool __sync = true) [static],  [inherited]
       Interaction with the standard C I/O objects.

       Parameters
           __sync Whether to synchronize or not.

       Returns
           True if the standard streams were previously synchronized.

       The synchronization referred to is only that between the standard C facilities (e.g.,
       stdout) and the standard C++ objects (e.g., cout). User-declared streams are unaffected.
       See
       https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary

   template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > *
       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.

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

   template<typename _CharT , typename _Traits > basic_ostream< _CharT, _Traits > *
       std::basic_ios< _CharT, _Traits >::tie (basic_ostream< _CharT, _Traits > * __tiestr)
       [inline]
       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.

   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.

   template<typename _CharT , typename _Traits > char_type std::basic_ios< _CharT, _Traits
       >::widen (char __c) const [inline]
       Widens characters.

       Parameters
           __c The character to widen.

       Returns
           The widened character.

       Maps a character of char to a character of char_type.

       Returns the result of

       std::use_facet<ctype<char_type> >(getloc()).widen(c)

       Additional l10n notes are at
       http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html

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

   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.

   streamsize std::ios_base::width (streamsize __wide) [inline],  [inherited]
       Changing flags.

       Parameters
           __wide The new width value.

       Returns
           The previous value of width().

   static int std::ios_base::xalloc () [static],  [inherited]
       Access to unique indices.

       Returns
           An integer different from all previous calls.

       This function returns a unique integer every time it is called. It can be used for any
       purpose, but is primarily intended to be a unique index for the iword and pword functions.
       The expectation is that an application calls xalloc in order to obtain an index in the
       iword and pword arrays that can be used without fear of conflict.

       The implementation maintains a static variable that is incremented and returned on each
       invocation. xalloc is guaranteed to return an index that is safe to use in the iword and
       pword arrays.

Member Data Documentation

   const fmtflags std::ios_base::adjustfield [static],  [inherited]
       A mask of left|right|internal. Useful for the 2-arg form of setf.

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

   const openmode std::ios_base::app [static],  [inherited]
       Seek to end before each write.

       Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), and std::basic_filebuf<
       _CharT, _Traits >::xsputn().

   const openmode std::ios_base::ate [static],  [inherited]
       Open and seek to end immediately after opening.

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

   const iostate std::ios_base::badbit [static],  [inherited]
       Indicates a loss of integrity in an input or output sequence (such as an irrecoverable
       read error from a file).

       Referenced by std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::basic_ios<
       _CharT, _Traits >::bad(), std::basic_ios< _CharT, _Traits >::fail(), std::basic_ostream<
       _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(),
       std::basic_istream< char >::get(), std::basic_istream< _CharT, _Traits >::get(),
       std::basic_ostream< _CharT, _Traits >::operator<<(), std::operator>>(),
       std::basic_istream< _CharT, _Traits >::operator>>(), 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<
       char >::seekg(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_istream<
       _CharT, _Traits >::seekg(), std::basic_istream< _CharT, _Traits >::sync(),
       std::basic_istream< _CharT, _Traits >::tellg(), std::basic_istream< char >::tellg(), and
       std::ws().

   const fmtflags std::ios_base::basefield [static],  [inherited]
       A mask of dec|oct|hex. Useful for the 2-arg form of setf.

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

   const seekdir std::ios_base::beg [static],  [inherited]
       Request a seek relative to the beginning of the stream.

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

   const openmode std::ios_base::binary [static],  [inherited]
       Perform input and output in binary mode (as opposed to text mode). This is probably not
       what you think it is; see
       https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary.

       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.

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

   const seekdir std::ios_base::cur [static],  [inherited]
       Request a seek relative to the current position within the sequence.

       Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT,
       _Traits >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(),
       std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits,
       _Alloc >::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.

       Referenced by std::dec().

   const seekdir std::ios_base::end [static],  [inherited]
       Request a seek relative to the current end of the sequence.

       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.

       Referenced by std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::time_get<
       _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::num_get<
       _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::num_get<
       _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter >::do_get_date(),
       std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter
       >::do_get_time(), std::time_get< _CharT, _InIter >::do_get_weekday(), std::time_get<
       _CharT, _InIter >::do_get_year(), std::basic_ios< _CharT, _Traits >::eof(),
       std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits
       >::get(), std::basic_istream< char >::get(), std::time_get< _CharT, _InIter >::get(),
       std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits
       >::operator>>(), std::operator>>(), 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_istream< _CharT,
       _Traits >::seekg(), std::basic_istream< char >::sync(), std::basic_istream< _CharT,
       _Traits >::unget(), and std::ws().

   const iostate std::ios_base::failbit [static],  [inherited]
       Indicates that an input operation failed to read the expected characters, or that an
       output operation failed to generate the desired characters.

       Referenced by std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::basic_ostream<
       _CharT, _Traits >::sentry::sentry(), std::num_get< _CharT, _InIter >::do_get(),
       std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter
       >::do_get_weekday(), std::time_get< _CharT, _InIter >::do_get_year(), std::basic_ios<
       _CharT, _Traits >::fail(), std::basic_istream< _CharT, _Traits >::get(),
       std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< char >::get(),
       std::time_get< _CharT, _InIter >::get(), std::basic_istream< _CharT, _Traits
       >::operator>>(), std::operator>>(), std::basic_istream< _CharT, _Traits >::operator>>(),
       std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits
       >::seekg(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT,
       _Traits >::seekp(), and std::basic_ostream< _CharT, _Traits >::seekp().

   const fmtflags std::ios_base::fixed [static],  [inherited]
       Generate floating-point output in fixed-point notation.

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

   const fmtflags std::ios_base::floatfield [static],  [inherited]
       A mask of scientific|fixed. Useful for the 2-arg form of setf.

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

   const iostate std::ios_base::goodbit [static],  [inherited]
       Indicates all is well.

       Referenced by std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::time_get<
       _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::time_get<
       _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_weekday(),
       std::time_get< _CharT, _InIter >::do_get_year(), std::basic_ostream< _CharT, _Traits
       >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT,
       _Traits >::get(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< char
       >::get(), std::basic_istream< _CharT, _Traits >::get(), std::time_get< _CharT, _InIter
       >::get(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT,
       _Traits >::ignore(), std::basic_ostream< _CharT, _Traits >::operator<<(),
       std::basic_istream< _CharT, _Traits >::operator>>(), std::operator>>(),
       std::basic_istream< _CharT, _Traits >::operator>>(), 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<
       char >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_istream<
       _CharT, _Traits >::seekg(), std::basic_istream< _CharT, _Traits >::sync(),
       std::basic_istream< _CharT, _Traits >::unget(), and std::ws().

   const fmtflags std::ios_base::hex [static],  [inherited]
       Converts integer input or generates integer output in hexadecimal base.

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

   const openmode std::ios_base::in [static],  [inherited]
       Open for input. Default for ifstream and fstream.

       Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(),
       std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_istream< _CharT, _Traits
       >::seekg(), 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_filebuf< _CharT, _Traits >::underflow(), std::basic_stringbuf<
       _CharT, _Traits, _Alloc >::underflow(), and std::basic_filebuf< _CharT, _Traits
       >::xsgetn().

   const fmtflags std::ios_base::internal [static],  [inherited]
       Adds fill characters at a designated internal point in certain generated output, or
       identical to right if no such point is designated.

       Referenced by std::internal().

   const fmtflags std::ios_base::left [static],  [inherited]
       Adds fill characters on the right (final positions) of certain generated output. (I.e.,
       the thing you print is flush left.)

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

   const fmtflags std::ios_base::oct [static],  [inherited]
       Converts integer input or generates integer output in octal base.

       Referenced by std::oct().

   const openmode std::ios_base::out [static],  [inherited]
       Open for output. Default for ofstream and fstream.

       Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf<
       _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc
       >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(),
       std::basic_ostream< _CharT, _Traits >::seekp(), 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]
       Adds fill characters on the left (initial positions) of certain generated output. (I.e.,
       the thing you print is flush right.)

       Referenced by std::right().

   const fmtflags std::ios_base::scientific [static],  [inherited]
       Generates floating-point output in scientific notation.

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

   const fmtflags std::ios_base::showbase [static],  [inherited]
       Generates a prefix indicating the numeric base of generated integer output.

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

   const fmtflags std::ios_base::showpoint [static],  [inherited]
       Generates a decimal-point character unconditionally in generated floating-point output.

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

   const fmtflags std::ios_base::showpos [static],  [inherited]
       Generates a + sign in non-negative generated numeric output.

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

   const fmtflags std::ios_base::skipws [static],  [inherited]
       Skips leading white space before certain input operations.

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

   const openmode std::ios_base::trunc [static],  [inherited]
       Truncate an existing stream when opening. Default for ofstream.

   const fmtflags std::ios_base::unitbuf [static],  [inherited]
       Flushes output after each output operation.

       Referenced by std::nounitbuf(), and std::unitbuf().

   const fmtflags std::ios_base::uppercase [static],  [inherited]
       Replaces certain lowercase letters with their uppercase equivalents in generated output.

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

Author

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