Inherits std::basic_ostream< _CharT, _Traits >.
typedef ctype< _CharT > __ctype_type
typedef basic_ios< _CharT, _Traits > __ios_type
typedef num_put< _CharT, ostreambuf_iterator< _CharT, _Traits > > __num_put_type
typedef basic_ostream< char_type, traits_type > __ostream_type
typedef basic_streambuf< _CharT, _Traits > __streambuf_type
typedef basic_string< _CharT, _Traits, _Alloc > __string_type
typedef basic_stringbuf< _CharT, _Traits, _Alloc > __stringbuf_type
typedef _Alloc allocator_type
typedef _CharT char_type
enum event { erase_event, imbue_event, copyfmt_event }
The set of events that may be passed to an event callback.
typedef void(* event_callback) (event __e, ios_base &__b, int __i)
The type of an event callback function.
typedef _Ios_Fmtflags fmtflags
This is a bitmask type.
typedef traits_type::int_type int_type
typedef int io_state
typedef _Ios_Iostate iostate
This is a bitmask type.
typedef traits_type::off_type off_type
typedef int open_mode
typedef _Ios_Openmode openmode
This is a bitmask type.
typedef traits_type::pos_type pos_type
typedef int seek_dir
typedef _Ios_Seekdir seekdir
This is an enumerated type.
typedef std::streamoff streamoff
typedef std::streampos streampos
typedef _Traits traits_type
typedef num_get< _CharT, istreambuf_iterator< _CharT, _Traits > > __num_get_type
basic_ostringstream (ios_base::openmode __mode=ios_base::out)
Default constructor starts with an empty string buffer.
basic_ostringstream (const __string_type &__str, ios_base::openmode __mode=ios_base::out)
Starts with an existing string buffer.
basic_ostringstream (const basic_ostringstream &)=delete
basic_ostringstream (basic_ostringstream &&__rhs)
~basic_ostringstream ()
The destructor does nothing.
const locale & _M_getloc () const
Locale access.
template<typename _ValueT > basic_ostream< _CharT, _Traits > & _M_insert (_ValueT __v)
void _M_setstate (iostate __state)
bool bad () const
Fast error checking.
void clear (iostate __state=goodbit)
[Re]sets the error state.
basic_ios & copyfmt (const basic_ios &__rhs)
Copies fields of __rhs into this.
bool eof () const
Fast error checking.
iostate exceptions () const
Throwing exceptions on errors.
void exceptions (iostate __except)
Throwing exceptions on errors.
bool fail () const
Fast error checking.
char_type fill () const
Retrieves the empty character.
char_type fill (char_type __ch)
Sets a new empty character.
fmtflags flags () const
Access to format flags.
fmtflags flags (fmtflags __fmtfl)
Setting new format flags all at once.
__ostream_type & flush ()
Synchronizing the stream buffer.
locale getloc () const
Locale access.
bool good () const
Fast error checking.
locale imbue (const locale &__loc)
Moves to a new locale.
long & iword (int __ix)
Access to integer array.
char narrow (char_type __c, char __dfault) const
Squeezes characters.
__ostream_type & operator<< (const void *__p)
Pointer arithmetic inserters.
__ostream_type & operator<< (__streambuf_type *__sb)
Extracting from another streambuf.
basic_ostringstream & operator= (const basic_ostringstream &)=delete
basic_ostringstream & operator= (basic_ostringstream &&__rhs)
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 (basic_streambuf< _CharT, _Traits > *__sb)
Changing the underlying buffer.
__stringbuf_type * rdbuf () const
Accessing the underlying buffer.
iostate rdstate () const
Returns the error state of the stream buffer.
void register_callback (event_callback __fn, int __index)
Add the callback __fn with parameter __index.
__ostream_type & seekp (pos_type)
Changing the current write position.
__ostream_type & seekp (off_type, ios_base::seekdir)
Changing the current write position.
fmtflags setf (fmtflags __fmtfl)
Setting new format flags.
fmtflags setf (fmtflags __fmtfl, fmtflags __mask)
Setting new format flags.
void setstate (iostate __state)
Sets additional flags in the error state.
__string_type str () const
Copying out the string buffer.
void str (const __string_type &__s)
Setting a new buffer.
void swap (basic_ostringstream &__rhs)
pos_type tellp ()
Getting the current write position.
basic_ostream< _CharT, _Traits > * tie () const
Fetches the current tied stream.
basic_ostream< _CharT, _Traits > * tie (basic_ostream< _CharT, _Traits > *__tiestr)
Ties this stream to an output stream.
void unsetf (fmtflags __mask)
Clearing format flags.
char_type widen (char __c) const
Widens characters.
streamsize width () const
Flags access.
streamsize width (streamsize __wide)
Changing flags.
__ostream_type & operator<< (__ostream_type &(*__pf)(__ostream_type &))
Interface for manipulators.
__ostream_type & operator<< (__ios_type &(*__pf)(__ios_type &))
Interface for manipulators.
__ostream_type & operator<< (ios_base &(*__pf)(ios_base &))
Interface for manipulators.
Inserters
All the operator<< functions (aka formatted output functions) have some common behavior. Each starts by constructing a temporary object of type std::basic_ostream::sentry. This can have several effects, concluding with the setting of a status flag; see the sentry documentation for more.
If the sentry status is good, the function tries to generate whatever data is appropriate for the type of the argument.
If an exception is thrown during insertion, ios_base::badbit will be turned on in the stream's error state without causing an ios_base::failure to be thrown. The original exception will then be rethrown.
__ostream_type & operator<< (long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (bool __n)
Integer arithmetic inserters.
__ostream_type & operator<< (short __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned short __n)
Integer arithmetic inserters.
__ostream_type & operator<< (int __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned int __n)
Integer arithmetic inserters.
__ostream_type & operator<< (long long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (unsigned long long __n)
Integer arithmetic inserters.
__ostream_type & operator<< (double __f)
Floating point arithmetic inserters.
__ostream_type & operator<< (float __f)
Floating point arithmetic inserters.
__ostream_type & operator<< (long double __f)
Floating point arithmetic inserters.
Unformatted Output Functions
All the unformatted output functions have some common behavior. Each starts by constructing a temporary object of type std::basic_ostream::sentry. This has several effects, concluding with the setting of a status flag; see the sentry documentation for more.
If the sentry status is good, the function tries to generate whatever data is appropriate for the type of the argument.
If an exception is thrown during insertion, ios_base::badbit will be turned on in the stream's error state. If badbit is on in the stream's exceptions mask, the exception will be rethrown without completing its actions.
__ostream_type & put (char_type __c)
Simple insertion.
void _M_write (const char_type *__s, streamsize __n)
Core write functionality, without sentry.
__ostream_type & write (const char_type *__s, streamsize __n)
Character string insertion.
operator bool () const
The quick-and-easy status check.
bool operator! () const
The quick-and-easy status check.
static bool sync_with_stdio (bool __sync=true)
Interaction with the standard C I/O objects.
static int xalloc () throw ()
Access to unique indices.
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
Open for input. 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.
void _M_cache_locale (const locale &__loc)
void _M_call_callbacks (event __ev) throw ()
void _M_dispose_callbacks (void) throw ()
_Words & _M_grow_words (int __index, bool __iword)
void _M_init () throw ()
template<typename _ValueT > __ostream_type & _M_insert (_ValueT __v)
void _M_move (ios_base &) noexcept
void _M_swap (ios_base &__rhs) noexcept
void init (basic_streambuf< _CharT, _Traits > *__sb)
All setup is performed here.
void move (basic_ios &__rhs)
void move (basic_ios &&__rhs)
void set_rdbuf (basic_streambuf< _CharT, _Traits > *__sb)
void swap (basic_ostream &__rhs)
void swap (basic_ios &__rhs) noexcept
_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
Template Parameters:
This class supports writing to objects of type std::basic_string, using the inherited functions from std::basic_ostream. To control the associated sequence, an instance of std::basic_stringbuf is used, which this page refers to as sb.
Definition at line 104 of file iosfwd.
Definition at line 91 of file basic_ios.h.
The type of an event callback function.
Parameters:
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 506 of file ios_base.h.
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 323 of file ios_base.h.
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 398 of file ios_base.h.
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 429 of file ios_base.h.
This is an enumerated type. _Ios_Seekdir is implementation-defined. Defined values of type seekdir are:
Definition at line 461 of file ios_base.h.
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 489 of file ios_base.h.
Default constructor starts with an empty string buffer.
Parameters:
ios_base::out is automatically included in mode.
Initializes sb using mode|out, and passes &sb to the base class initializer. Does not allocate any buffer.
That's a lie. We initialize the base class with NULL, because the string class does its own memory management.
Definition at line 561 of file sstream.
References std::basic_ios< _CharT, _Traits >::init().
Starts with an existing string buffer.
Parameters:
ios_base::out is automatically included in mode.
Initializes sb using str and mode|out, and passes &sb to the base class initializer.
That's a lie. We initialize the base class with NULL, because the string class does its own memory management.
Definition at line 579 of file sstream.
References std::basic_ios< _CharT, _Traits >::init().
The destructor does nothing. The buffer is deallocated by the stringbuf object, not the formatting stream.
Definition at line 590 of file sstream.
Locale access.
Returns:
Like getloc above, but returns a reference instead of generating a copy.
Definition at line 776 of file ios_base.h.
Referenced by std::time_get< _CharT, _InIter >::do_get(), 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_put< _CharT, _OutIter >::do_put(), std::num_put< _CharT, _OutIter >::do_put(), std::time_get< _CharT, _InIter >::get(), and std::time_put< _CharT, _OutIter >::put().
Core write functionality, without sentry.
Parameters:
Definition at line 311 of file ostream.
Fast error checking.
Returns:
Note that other iostate flags may also be set.
Definition at line 211 of file basic_ios.h.
[Re]sets the error state.
Parameters:
See std::ios_base::iostate for the possible bit values. Most users will not need to pass an argument.
Definition at line 41 of file basic_ios.tcc.
Referenced by std::basic_ios< char, _Traits >::exceptions(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_fstream< _CharT, _Traits >::open(), std::__detail::operator>>(), std::basic_istream< char >::putback(), std::basic_istream< char >::seekg(), std::basic_ios< char, _Traits >::setstate(), and std::basic_istream< char >::unget().
Copies fields of __rhs into this.
Parameters:
Returns:
All fields of __rhs are copied into this object except that rdbuf() and rdstate() remain unchanged. All values in the pword and iword arrays are copied. Before copying, each callback is invoked with erase_event. After copying, each (new) callback is invoked with copyfmt_event. The final step is to copy exceptions().
Definition at line 63 of file basic_ios.tcc.
Fast error checking.
Returns:
Note that other iostate flags may also be set.
Definition at line 190 of file basic_ios.h.
Throwing exceptions on errors.
Returns:
This changes nothing in the stream. See the one-argument version of exceptions(iostate) for the meaning of the return value.
Definition at line 222 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt().
Throwing exceptions on errors.
Parameters:
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;
f.setstate (std::ios_base::badbit);
std::cerr << "Setting exception mask;
f.exceptions (std::ios_base::badbit);
}
Definition at line 257 of file basic_ios.h.
Fast error checking.
Returns:
Checking the badbit in fail() is historical practice. Note that other iostate flags may also be set.
Definition at line 201 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::operator bool(), std::basic_ios< char, _Traits >::operator!(), and std::regex_traits< _CharType >::value().
Retrieves the empty character.
Returns:
It defaults to a space (' ') in the current locale.
Definition at line 370 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt(), std::basic_ios< char, _Traits >::fill(), and std::operator<<().
Sets a new empty character.
Parameters:
Returns:
The fill character is used to fill out space when P+ characters have been requested (e.g., via setw), Q characters are actually used, and Q<P. It defaults to a space (' ') in the current locale.
Definition at line 390 of file basic_ios.h.
Access to format flags.
Returns:
Definition at line 621 of file ios_base.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt(), std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), std::basic_ostream< char >::operator<<(), std::operator<<(), std::__detail::operator>>(), and std::operator>>().
Setting new format flags all at once.
Parameters:
Returns:
This function overwrites all the format flags with __fmtfl.
Definition at line 632 of file ios_base.h.
Synchronizing the stream buffer.
Returns:
If rdbuf() is a null pointer, changes nothing.
Otherwise, calls rdbuf()->pubsync(), and if that returns -1, sets badbit.
Definition at line 211 of file ostream.tcc.
Locale access.
Returns:
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 765 of file ios_base.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt(), std::money_put< _CharT, _OutIter >::do_put(), std::tr2::operator<<(), std::operator<<(), and std::ws().
Fast error checking.
Returns:
A wrapper around rdstate.
Definition at line 180 of file basic_ios.h.
Referenced by std::__detail::operator>>(), std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
Moves to a new locale.
Parameters:
Returns:
Calls ios_base::imbue(loc), and if a stream buffer is associated with this stream, calls that buffer's pubimbue(loc).
Additional l10n notes are at http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 114 of file basic_ios.tcc.
Referenced by std::operator<<().
All setup is performed here. This is called from the public constructor. It is not virtual and cannot be redefined.
Definition at line 126 of file basic_ios.tcc.
Referenced by std::basic_fstream< _CharT, _Traits >::basic_fstream(), std::basic_ifstream< _CharT, _Traits >::basic_ifstream(), std::basic_ios< char, _Traits >::basic_ios(), std::basic_istream< char >::basic_istream(), std::basic_istringstream< _CharT, _Traits, _Alloc >::basic_istringstream(), std::basic_ofstream< _CharT, _Traits >::basic_ofstream(), std::basic_ostream< char >::basic_ostream(), std::basic_ostringstream< _CharT, _Traits, _Alloc >::basic_ostringstream(), and std::basic_stringstream< _CharT, _Traits, _Alloc >::basic_stringstream().
Access to integer array.
Parameters:
Returns:
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 811 of file ios_base.h.
Squeezes characters.
Parameters:
Returns:
Maps a character of char_type to a character of char, if possible.
Returns the result of
std::use_facet<ctype<char_type> >(getloc()).narrow(c,dfault)
Additional l10n notes are at http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 430 of file basic_ios.h.
The quick-and-easy status check. This allows you to write constructs such as if (!a_stream) ... and while (a_stream) ...
Definition at line 117 of file basic_ios.h.
The quick-and-easy status check. This allows you to write constructs such as if (!a_stream) ... and while (a_stream) ...
Definition at line 125 of file basic_ios.h.
Interface for manipulators. Manipulators such as std::endl and std::hex use these functions in constructs like 'std::cout << std::endl'. For more information, see the iomanip header.
Definition at line 108 of file ostream.
Interface for manipulators. Manipulators such as std::endl and std::hex use these functions in constructs like 'std::cout << std::endl'. For more information, see the iomanip header.
Definition at line 117 of file ostream.
Interface for manipulators. Manipulators such as std::endl and std::hex use these functions in constructs like 'std::cout << std::endl'. For more information, see the iomanip header.
Definition at line 127 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 166 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 170 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 174 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 92 of file ostream.tcc.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 181 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 106 of file ostream.tcc.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 192 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 201 of file ostream.
Integer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 205 of file ostream.
Floating point arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 220 of file ostream.
Floating point arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 224 of file ostream.
Floating point arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 232 of file ostream.
Pointer arithmetic inserters.
Parameters:
Returns:
These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.
Definition at line 245 of file ostream.
Extracting from another streambuf.
Parameters:
This function behaves like one of the basic arithmetic extractors, in that it also constructs a sentry object and has the same error handling behavior.
If __sb is NULL, the stream will set failbit in its error state.
Characters are extracted from __sb and inserted into *this until one of the following occurs:
If the function inserts no characters, failbit is set.
Definition at line 120 of file ostream.tcc.
Flags access.
Returns:
Be careful if you try to give a definition of precision here; see DR 189.
Definition at line 691 of file ios_base.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt(), and std::operator<<().
Changing flags.
Parameters:
Returns:
Definition at line 700 of file ios_base.h.
Simple insertion.
Parameters:
Returns:
Tries to insert __c.
Note:
Definition at line 149 of file ostream.tcc.
Access to void pointer array.
Parameters:
Returns:
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 832 of file ios_base.h.
Changing the underlying buffer.
Parameters:
Returns:
Associates a new buffer with the current stream, and clears the error state.
Due to historical accidents which the LWG refuses to correct, the I/O library suffers from a design error: this function is hidden in derived classes by overrides of the zero-argument rdbuf(), which is non-virtual for hysterical raisins. As a result, you must use explicit qualifications to access this function via any derived class. For example:
std::fstream foo; // or some other derived type std::streambuf* p = .....; foo.ios::rdbuf(p); // ios == basic_ios<char>
Definition at line 53 of file basic_ios.tcc.
Accessing the underlying buffer.
Returns:
This hides both signatures of std::basic_ios::rdbuf().
Definition at line 630 of file sstream.
Returns the error state of the stream buffer.
Returns:
See std::ios_base::iostate for the possible bit values. Most users will call one of the interpreting wrappers, e.g., good().
Definition at line 137 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::bad(), std::basic_ios< char, _Traits >::eof(), std::basic_ios< char, _Traits >::fail(), std::basic_ios< char, _Traits >::good(), std::basic_istream< char >::putback(), std::basic_istream< char >::seekg(), std::basic_ios< char, _Traits >::setstate(), and std::basic_istream< char >::unget().
Add the callback __fn with parameter __index.
Parameters:
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.
Changing the current write position.
Parameters:
Returns:
If fail() is not true, calls rdbuf()->pubseekpos(pos). If that function fails, sets failbit.
Definition at line 258 of file ostream.tcc.
Changing the current write position.
Parameters:
Returns:
If fail() is not true, calls rdbuf()->pubseekoff(off,dir). If that function fails, sets failbit.
Definition at line 290 of file ostream.tcc.
Setting new format flags.
Parameters:
Returns:
This function sets additional flags in format control. Flags that were previously set remain set.
Definition at line 648 of file ios_base.h.
Referenced by std::__detail::operator>>().
Setting new format flags.
Parameters:
Returns:
This function clears mask in the format flags, then sets fmtfl & mask. An example mask is ios_base::adjustfield.
Definition at line 665 of file ios_base.h.
Sets additional flags in the error state.
Parameters:
See std::ios_base::iostate for the possible bit values.
Definition at line 157 of file basic_ios.h.
Referenced by std::basic_ostream< char >::_M_write(), std::basic_ifstream< _CharT, _Traits >::close(), std::basic_ofstream< _CharT, _Traits >::close(), std::basic_fstream< _CharT, _Traits >::close(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_fstream< _CharT, _Traits >::open(), std::operator<<(), std::operator>>(), std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::ws().
Copying out the string buffer.
Returns:
Definition at line 638 of file sstream.
Referenced by std::__detail::operator<<(), and std::operator<<().
Setting a new buffer.
Parameters:
Calls rdbuf()->str(s).
Definition at line 648 of file sstream.
Interaction with the standard C I/O objects.
Parameters:
Returns:
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
Getting the current write position.
Returns:
If fail() is not false, returns pos_type(-1) to indicate failure. Otherwise returns rdbuf()->pubseekoff(0,cur,out).
Definition at line 237 of file ostream.tcc.
Fetches the current tied stream.
Returns:
A stream may be tied (or synchronized) to a second output stream. When this stream performs any I/O, the tied stream is first flushed. For example, std::cin is tied to std::cout.
Definition at line 295 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt(), and std::basic_ostream< _CharT, _Traits >::sentry::sentry().
Ties this stream to an output stream.
Parameters:
Returns:
This sets up a new tie; see tie() for more.
Definition at line 307 of file basic_ios.h.
Clearing format flags.
Parameters:
This function clears __mask in the format flags.
Definition at line 680 of file ios_base.h.
Widens characters.
Parameters:
Returns:
Maps a character of char to a character of char_type.
Returns the result of
std::use_facet<ctype<char_type> >(getloc()).widen(c)
Additional l10n notes are at http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 449 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::fill(), std::basic_istream< char >::get(), std::basic_istream< char >::getline(), std::getline(), std::operator<<(), std::tr2::operator>>(), and std::operator>>().
Flags access.
Returns:
Minimum field width refers to the number of characters.
Definition at line 714 of file ios_base.h.
Referenced by std::basic_ios< char, _Traits >::copyfmt(), and std::num_put< _CharT, _OutIter >::do_put().
Changing flags.
Parameters:
Returns:
Definition at line 723 of file ios_base.h.
Character string insertion.
Parameters:
Returns:
Characters are copied from __s and inserted into the stream until one of the following happens:
Note:
Definition at line 183 of file ostream.tcc.
Access to unique indices.
Returns:
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.
A mask of left|right|internal. Useful for the 2-arg form of setf.
Definition at line 378 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put().
Seek to end before each write.
Definition at line 432 of file ios_base.h.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
Open and seek to end immediately after opening.
Definition at line 435 of file ios_base.h.
Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file).
Definition at line 402 of file ios_base.h.
Referenced by std::basic_ostream< char >::_M_write(), std::basic_ios< char, _Traits >::bad(), std::basic_ios< char, _Traits >::fail(), std::operator<<(), and std::basic_ostream< _CharT, _Traits >::sentry::~sentry().
A mask of dec|oct|hex. Useful for the 2-arg form of setf.
Definition at line 381 of file ios_base.h.
Referenced by std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), and std::basic_ostream< char >::operator<<().
Request a seek relative to the beginning of the stream.
Definition at line 464 of file ios_base.h.
Perform input and output in binary mode (as opposed to text mode). This is probably not what you think it is; see https://gcc.gnu.org/onlinedocs/libstdc++/manual/fstreams.html#std.io.filestreams.binary.
Definition at line 440 of file ios_base.h.
Insert/extract bool in alphabetic rather than numeric format.
Definition at line 326 of file ios_base.h.
Referenced by std::num_get< _CharT, _InIter >::do_get(), and std::num_put< _CharT, _OutIter >::do_put().
Request a seek relative to the current position within the sequence.
Definition at line 467 of file ios_base.h.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff().
Converts integer input or generates integer output in decimal base.
Definition at line 329 of file ios_base.h.
Request a seek relative to the current end of the sequence.
Definition at line 470 of file ios_base.h.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff().
Indicates that an input operation reached the end of an input sequence.
Definition at line 405 of file ios_base.h.
Referenced by std::time_get< _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter >::do_get_date(), std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_time(), std::time_get< _CharT, _InIter >::do_get_weekday(), std::time_get< _CharT, _InIter >::do_get_year(), std::basic_ios< char, _Traits >::eof(), std::time_get< _CharT, _InIter >::get(), std::basic_istream< char >::putback(), std::basic_istream< char >::seekg(), std::basic_istream< char >::unget(), and std::ws().
Indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters.
Definition at line 410 of file ios_base.h.
Referenced by std::basic_ifstream< _CharT, _Traits >::close(), std::basic_ofstream< _CharT, _Traits >::close(), std::basic_fstream< _CharT, _Traits >::close(), 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< char, _Traits >::fail(), std::time_get< _CharT, _InIter >::get(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_fstream< _CharT, _Traits >::open(), std::operator>>(), and std::basic_ostream< _CharT, _Traits >::sentry::sentry().
Generate floating-point output in fixed-point notation.
Definition at line 332 of file ios_base.h.
A mask of scientific|fixed. Useful for the 2-arg form of setf.
Definition at line 384 of file ios_base.h.
Indicates all is well.
Definition at line 413 of file ios_base.h.
Referenced by std::time_get< _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_weekday(), std::time_get< _CharT, _InIter >::do_get_year(), std::basic_ostream< char >::flush(), std::basic_istream< char >::get(), std::time_get< _CharT, _InIter >::get(), std::basic_istream< char >::getline(), std::basic_istream< char >::ignore(), std::basic_ostream< char >::operator<<(), std::basic_istream< char >::operator>>(), std::operator>>(), std::basic_istream< char >::peek(), std::basic_ostream< char >::put(), std::basic_istream< char >::putback(), std::basic_istream< char >::read(), std::basic_istream< char >::readsome(), std::basic_istream< char >::seekg(), std::basic_ostream< char >::seekp(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::basic_istream< char >::sync(), and std::basic_istream< char >::unget().
Converts integer input or generates integer output in hexadecimal base.
Definition at line 335 of file ios_base.h.
Referenced by std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), and std::basic_ostream< char >::operator<<().
Open for input. Default for ifstream and fstream.
Definition at line 443 of file ios_base.h.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow().
Adds fill characters at a designated internal point in certain generated output, or identical to right if no such point is designated.
Definition at line 340 of file ios_base.h.
Adds fill characters on the right (final positions) of certain generated output. (I.e., the thing you print is flush left.)
Definition at line 344 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put().
Converts integer input or generates integer output in octal base.
Definition at line 347 of file ios_base.h.
Referenced by std::basic_ostream< char >::operator<<().
Open for output. Default for ofstream and fstream.
Definition at line 446 of file ios_base.h.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos().
Adds fill characters on the left (initial positions) of certain generated output. (I.e., the thing you print is flush right.)
Definition at line 351 of file ios_base.h.
Generates floating-point output in scientific notation.
Definition at line 354 of file ios_base.h.
Generates a prefix indicating the numeric base of generated integer output.
Definition at line 358 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put().
Generates a decimal-point character unconditionally in generated floating-point output.
Definition at line 362 of file ios_base.h.
Generates a + sign in non-negative generated numeric output.
Definition at line 365 of file ios_base.h.
Skips leading white space before certain input operations.
Definition at line 368 of file ios_base.h.
Open for input. Default for ofstream.
Definition at line 449 of file ios_base.h.
Flushes output after each output operation.
Definition at line 371 of file ios_base.h.
Referenced by std::basic_ostream< _CharT, _Traits >::sentry::~sentry().
Replaces certain lowercase letters with their uppercase equivalents in generated output.
Definition at line 375 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put().
Generated automatically by Doxygen for libstdc++ from the source code.