Controlling input and output for std::string.This class supports reading from and writing to objects of type std::basic_string, using the inherited functions from std::basic_iostream. To control the associated sequence, an instance of std::basic_stringbuf is used, which this page refers to as sb
.
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All the operator>>
functions (aka formatted input functions) have some common behavior. Each starts by constructing a temporary object of type std::basic_istream::sentry with the second argument (noskipws) set to false. This has several effects, concluding with the setting of a status flag; see the sentry documentation for more.
If the sentry status is good, the function tries to extract whatever data is appropriate for the type of the argument.
If an exception is thrown during extraction, ios_base::badbit will be turned on in the stream's error state without causing an ios_base::failure to be thrown. The original exception will then be rethrown.
All the unformatted input functions have some common behavior. Each starts by constructing a temporary object of type std::basic_istream::sentry with the second argument (noskipws) set to true. This has several effects, concluding with the setting of a status flag; see the sentry documentation for more.
If the sentry status is good, the function tries to extract whatever data is appropriate for the type of the argument.
The number of characters extracted is stored for later retrieval by gcount().
If an exception is thrown during extraction, ios_base::badbit will be turned on in the stream's error state without causing an ios_base::failure to be thrown. The original exception will then be rethrown.
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.
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.
Controlling input and output for std::string.
This class supports reading from and writing to objects of type std::basic_string, using the inherited functions from std::basic_iostream. To control the associated sequence, an instance of std::basic_stringbuf is used, which this page refers to as sb
.
Definition at line 483 of file sstream.
typedef ctype<_CharT> std::basic_istream< _CharT, _Traits >::__ctype_type [inherited] |
These are non-standard types.
Reimplemented from std::basic_ios< _CharT, _Traits >.
typedef ctype<_CharT> std::basic_ostream< _CharT, _Traits >::__ctype_type [inherited] |
These are non-standard types.
Reimplemented from std::basic_ios< _CharT, _Traits >.
typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> > std::basic_istream< _CharT, _Traits >::__num_get_type [inherited] |
These are non-standard types.
Reimplemented from std::basic_ios< _CharT, _Traits >.
typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_put_type [inherited] |
These are non-standard types.
Reimplemented in std::basic_ostream< _CharT, _Traits >, std::basic_ostream< char, _Traits >, and std::basic_ostream< char >.
Definition at line 86 of file basic_ios.h.
typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> > std::basic_ostream< _CharT, _Traits >::__num_put_type [inherited] |
These are non-standard types.
Reimplemented from std::basic_ios< _CharT, _Traits >.
typedef _CharT std::basic_istream< _CharT, _Traits >::char_type [inherited] |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_ios< _CharT, _Traits >.
Reimplemented in std::basic_ifstream< _CharT, _Traits >, and std::basic_istringstream< _CharT, _Traits, _Alloc >.
typedef _CharT std::basic_stringstream< _CharT, _Traits, _Alloc >::char_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_iostream< _CharT, _Traits >.
typedef void(* std::ios_base::event_callback)(event, ios_base &, int) [inherited] |
The type of an event callback function.
event | One of the members of the event enum. | |
ios_base | Reference to the ios_base object. | |
int | The integer provided when the callback was registered. |
Event callbacks are user defined functions that get called during several ios_base and basic_ios functions, specifically imbue(), copyfmt(), and ~ios().
Definition at line 438 of file ios_base.h.
typedef _Ios_Fmtflags std::ios_base::fmtflags [inherited] |
This is a bitmask type.
_Ios_Fmtflags is
implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type fmtflags are:
Definition at line 257 of file ios_base.h.
typedef _Traits::int_type std::basic_istream< _CharT, _Traits >::int_type [inherited] |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_ios< _CharT, _Traits >.
Reimplemented in std::basic_ifstream< _CharT, _Traits >, and std::basic_istringstream< _CharT, _Traits, _Alloc >.
typedef traits_type::int_type std::basic_stringstream< _CharT, _Traits, _Alloc >::int_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_iostream< _CharT, _Traits >.
typedef _Ios_Iostate std::ios_base::iostate [inherited] |
This is a bitmask type.
_Ios_Iostate is
implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type iostate are:
Definition at line 332 of file ios_base.h.
typedef traits_type::off_type std::basic_stringstream< _CharT, _Traits, _Alloc >::off_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_iostream< _CharT, _Traits >.
typedef _Traits::off_type std::basic_istream< _CharT, _Traits >::off_type [inherited] |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_ios< _CharT, _Traits >.
Reimplemented in std::basic_ifstream< _CharT, _Traits >, and std::basic_istringstream< _CharT, _Traits, _Alloc >.
typedef _Ios_Openmode std::ios_base::openmode [inherited] |
This is a bitmask type.
_Ios_Openmode is
implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type openmode are:
Definition at line 363 of file ios_base.h.
typedef traits_type::pos_type std::basic_stringstream< _CharT, _Traits, _Alloc >::pos_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_iostream< _CharT, _Traits >.
typedef _Traits::pos_type std::basic_istream< _CharT, _Traits >::pos_type [inherited] |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_ios< _CharT, _Traits >.
Reimplemented in std::basic_ifstream< _CharT, _Traits >, and std::basic_istringstream< _CharT, _Traits, _Alloc >.
typedef _Ios_Seekdir std::ios_base::seekdir [inherited] |
This is an enumerated type.
_Ios_Seekdir is
implementation-defined. Defined values of type seekdir are:
SEEK_CUR
in the C standard library.SEEK_END
in the C standard library. Definition at line 395 of file ios_base.h.
typedef _Traits std::basic_istream< _CharT, _Traits >::traits_type [inherited] |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_ios< _CharT, _Traits >.
Reimplemented in std::basic_ifstream< _CharT, _Traits >, and std::basic_istringstream< _CharT, _Traits, _Alloc >.
typedef _Traits std::basic_stringstream< _CharT, _Traits, _Alloc >::traits_type |
These are standard types. They permit a standardized way of referring to names of (or names dependant on) the template parameters, which are specific to the implementation.
Reimplemented from std::basic_iostream< _CharT, _Traits >.
enum std::ios_base::event [inherited] |
The set of events that may be passed to an event callback.
erase_event is used during ~ios() and copyfmt(). imbue_event is used during imbue(). copyfmt_event is used during copyfmt().
Definition at line 421 of file ios_base.h.
std::basic_stringstream< _CharT, _Traits, _Alloc >::basic_stringstream | ( | ios_base::openmode | __m = ios_base::out | ios_base::in |
) | [inline, explicit] |
Default constructor starts with an empty string buffer.
mode | Whether the buffer can read, or write, or both. |
Initializes sb
using mode
, 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 517 of file sstream.
References std::basic_ios< _CharT, _Traits >::init().
std::basic_stringstream< _CharT, _Traits, _Alloc >::basic_stringstream | ( | const __string_type & | __str, | |
ios_base::openmode | __m = ios_base::out | ios_base::in | |||
) | [inline, explicit] |
Starts with an existing string buffer.
str | A string to copy as a starting buffer. | |
mode | Whether the buffer can read, or write, or both. |
Initializes sb
using str and mode
, 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 533 of file sstream.
References std::basic_ios< _CharT, _Traits >::init().
std::basic_stringstream< _CharT, _Traits, _Alloc >::~basic_stringstream | ( | ) | [inline] |
const locale& std::ios_base::_M_getloc | ( | ) | const [inline, inherited] |
Locale access.
Like getloc above, but returns a reference instead of generating a copy.
Definition at line 708 of file ios_base.h.
Referenced by std::money_get< _CharT, _InIter >::do_get(), std::num_get< _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter >::do_get_date(), std::time_get< _CharT, _InIter >::do_get_monthname(), std::time_get< _CharT, _InIter >::do_get_time(), std::time_get< _CharT, _InIter >::do_get_weekday(), std::time_get< _CharT, _InIter >::do_get_year(), std::time_put< _CharT, _OutIter >::do_put(), std::num_put< _CharT, _OutIter >::do_put(), and std::time_put< _CharT, _OutIter >::put().
void std::basic_ostream< _CharT, _Traits >::_M_write | ( | const char_type * | __s, | |
streamsize | __n | |||
) | [inline, inherited] |
bool std::basic_ios< _CharT, _Traits >::bad | ( | ) | const [inline, inherited] |
Fast error checking.
Note that other iostate flags may also be set.
Definition at line 203 of file basic_ios.h.
void std::basic_ios< _CharT, _Traits >::clear | ( | iostate | __state = goodbit |
) | [inherited] |
[Re]sets the error state.
state | The new state flag(s) to set. |
See std::ios_base::iostate for the possible bit values. Most users will not need to pass an argument.
Definition at line 42 of file basic_ios.tcc.
References std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::exceptions(), std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::rdstate().
Referenced by std::basic_ios< char, _Traits >::exceptions(), std::basic_fstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ios< char, _Traits >::setstate(), and std::basic_istream< _CharT, _Traits >::unget().
basic_ios< _CharT, _Traits > & std::basic_ios< _CharT, _Traits >::copyfmt | ( | const basic_ios< _CharT, _Traits > & | __rhs | ) | [inherited] |
Copies fields of __rhs into this.
__rhs | The source values for the copies. |
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 64 of file basic_ios.tcc.
References std::basic_ios< _CharT, _Traits >::exceptions(), std::basic_ios< _CharT, _Traits >::fill(), std::ios_base::flags(), std::ios_base::getloc(), std::ios_base::precision(), std::basic_ios< _CharT, _Traits >::tie(), and std::ios_base::width().
bool std::basic_ios< _CharT, _Traits >::eof | ( | ) | const [inline, inherited] |
Fast error checking.
Note that other iostate flags may also be set.
Definition at line 182 of file basic_ios.h.
Referenced by std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::unget().
iostate std::basic_ios< _CharT, _Traits >::exceptions | ( | ) | const [inline, inherited] |
Throwing exceptions on errors.
This changes nothing in the stream. See the one-argument version of exceptions(iostate) for the meaning of the return value.
Definition at line 214 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::clear(), and std::basic_ios< _CharT, _Traits >::copyfmt().
void std::basic_ios< _CharT, _Traits >::exceptions | ( | iostate | __except | ) | [inline, inherited] |
Throwing exceptions on errors.
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); }
Definition at line 249 of file basic_ios.h.
bool std::basic_ios< _CharT, _Traits >::fail | ( | ) | const [inline, inherited] |
Fast error checking.
Checking the badbit in fail() is historical practice. Note that other iostate flags may also be set.
Definition at line 193 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::operator void *(), std::basic_ios< char, _Traits >::operator!(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::tellg(), std::basic_ostream< _CharT, _Traits >::tellp(), and std::regex_traits< _Ch_type >::value().
char_type std::basic_ios< _CharT, _Traits >::fill | ( | ) | const [inline, inherited] |
Retrieves the empty character.
It defaults to a space (' ') in the current locale.
Definition at line 362 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::basic_ios< char, _Traits >::fill().
char_type std::basic_ios< _CharT, _Traits >::fill | ( | char_type | __ch | ) | [inline, inherited] |
Sets a new empty character.
ch | The new character. |
The fill character is used to fill out space when P+ characters have been requested (e.g., via setw), Q characters are actually used, and Q<P. It defaults to a space (' ') in the current locale.
Definition at line 382 of file basic_ios.h.
fmtflags std::ios_base::flags | ( | ) | const [inline, inherited] |
Access to format flags.
Definition at line 553 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::operator<<(), std::operator>>(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
Setting new format flags all at once.
fmtfl | The new flags to set. |
This function overwrites all the format flags with fmtfl.
Definition at line 564 of file ios_base.h.
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::flush | ( | ) | [inherited] |
Synchronizing the stream buffer.
If rdbuf()
is a null pointer, changes nothing.
Otherwise, calls rdbuf()->pubsync()
, and if that returns -1, sets badbit.
Definition at line 213 of file ostream.tcc.
References std::ios_base::badbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
Referenced by std::flush().
streamsize std::basic_istream< _CharT, _Traits >::gcount | ( | ) | const [inline, inherited] |
basic_istream< _CharT, _Traits >::int_type std::basic_istream< _CharT, _Traits >::get | ( | void | ) | [inherited] |
Simple extraction.
Tries to extract a character. If none are available, sets failbit and returns traits::eof().
Definition at line 238 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::get | ( | char_type & | __c | ) | [inherited] |
Simple extraction.
c | The character in which to store data. |
Tries to extract a character and store it in c. If none are available, sets failbit and returns traits::eof().
Definition at line 274 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
__istream_type& std::basic_istream< _CharT, _Traits >::get | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inline, inherited] |
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::get | ( | __streambuf_type & | __sb, | |
char_type | __delim | |||
) | [inherited] |
Extraction into another streambuf.
sb | A streambuf in which to store data. | |
delim | A "stop" character. |
Characters are extracted and inserted into sb until one of the following happens:
If no characters are stored, failbit is set in the stream's error state.
Definition at line 358 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), std::basic_streambuf< _CharT, _Traits >::snextc(), and std::basic_streambuf< _CharT, _Traits >::sputc().
__istream_type& std::basic_istream< _CharT, _Traits >::get | ( | __streambuf_type & | __sb | ) | [inline, inherited] |
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::get | ( | char_type * | __s, | |
streamsize | __n, | |||
char_type | __delim | |||
) | [inherited] |
Simple multiple-character extraction.
s | Pointer to an array. | |
n | Maximum number of characters to store in s. | |
delim | A "stop" character. |
Characters are extracted and stored into s until one of the following happens:
n-1
characters are storedIf no characters are stored, failbit is set in the stream's error state.
In any case, a null character is stored into the next location in the array.
Definition at line 311 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::getline | ( | char_type * | __s, | |
streamsize | __n, | |||
char_type | __delim | |||
) | [inherited] |
String extraction.
s | A character array in which to store the data. | |
n | Maximum number of characters to extract. | |
delim | A "stop" character. |
Extracts and stores characters into s until one of the following happens. Note that these criteria are required to be tested in the order listed here, to allow an input line to exactly fill the s array without setting failbit.
delim
, in which case the character is extracted (and therefore counted in gcount()
) but not storedn-1
characters are stored, in which case failbit is set in the stream error stateIf no characters are extracted, failbit is set. (An empty line of input should therefore not cause failbit to be set.)
In any case, a null character is stored in the next location in the array.
Definition at line 402 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_streambuf< _CharT, _Traits >::sbumpc(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().
__istream_type& std::basic_istream< _CharT, _Traits >::getline | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inline, inherited] |
String extraction.
s | A character array in which to store the data. | |
n | Maximum number of characters to extract. |
Returns getline
(s,n,widen('\n')).
Definition at line 408 of file istream.
Referenced by std::basic_istream< char >::getline().
locale std::ios_base::getloc | ( | ) | const [inline, inherited] |
Locale access.
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 697 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::money_put< _CharT, _OutIter >::do_put(), std::basic_ios< _CharT, _Traits >::imbue(), std::operator>>(), and std::ws().
bool std::basic_ios< _CharT, _Traits >::good | ( | ) | const [inline, inherited] |
Fast error checking.
A wrapper around rdstate.
Definition at line 172 of file basic_ios.h.
Referenced by std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::ignore | ( | streamsize | __n | ) | [inherited] |
Simple extraction.
Tries to extract a character. If none are available, sets failbit and returns traits::eof().
Definition at line 495 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::ignore | ( | void | ) | [inherited] |
Discarding characters.
n | Number of characters to discard. | |
delim | A "stop" character. |
Extracts characters and throws them away until one of the following happens:
!=
std::numeric_limits<int>::max()
, n characters are extractedtraits::eof()
.NB: Provide three overloads, instead of the single function (with defaults) mandated by the Standard: this leads to a better performing implementation, while still conforming to the Standard.
Definition at line 462 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_streambuf< _CharT, _Traits >::sbumpc(), and std::basic_ios< _CharT, _Traits >::setstate().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::ignore | ( | streamsize | __n, | |
int_type | __delim | |||
) | [inherited] |
Simple extraction.
Tries to extract a character. If none are available, sets failbit and returns traits::eof().
Definition at line 557 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_streambuf< _CharT, _Traits >::sbumpc(), std::basic_ios< _CharT, _Traits >::setstate(), std::basic_streambuf< _CharT, _Traits >::sgetc(), and std::basic_streambuf< _CharT, _Traits >::snextc().
locale std::basic_ios< _CharT, _Traits >::imbue | ( | const locale & | __loc | ) | [inherited] |
Moves to a new locale.
loc | The new 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
Reimplemented from std::ios_base.
Definition at line 115 of file basic_ios.tcc.
References std::ios_base::getloc(), and std::basic_ios< _CharT, _Traits >::rdbuf().
Referenced by std::operator<<().
void std::basic_ios< _CharT, _Traits >::init | ( | basic_streambuf< _CharT, _Traits > * | __sb | ) | [protected, inherited] |
All setup is performed here.
This is called from the public constructor. It is not virtual and cannot be redefined.
Definition at line 127 of file basic_ios.tcc.
References std::ios_base::badbit, and std::ios_base::goodbit.
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().
long& std::ios_base::iword | ( | int | __ix | ) | [inline, inherited] |
Access to integer array.
__ix | Index into the array. |
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 743 of file ios_base.h.
char std::basic_ios< _CharT, _Traits >::narrow | ( | char_type | __c, | |
char | __dfault | |||
) | const [inline, inherited] |
Squeezes characters.
c | The character to narrow. | |
dfault | The character to narrow. |
Maps a character of char_type
to a character of char
, if possible.
Returns the result of
Additional l10n notes are at http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 422 of file basic_ios.h.
std::basic_ios< _CharT, _Traits >::operator void * | ( | ) | const [inline, inherited] |
The quick-and-easy status check.
This allows you to write constructs such as if (!a_stream) ...
and while (a_stream) ...
Definition at line 113 of file basic_ios.h.
bool std::basic_ios< _CharT, _Traits >::operator! | ( | ) | const [inline, inherited] |
The quick-and-easy status check.
This allows you to write constructs such as if (!a_stream) ...
and while (a_stream) ...
Definition at line 117 of file basic_ios.h.
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | float | __f | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | bool | __n | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | unsigned short | __n | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | __ostream_type &(*)(__ostream_type &) | __pf | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | __ios_type &(*)(__ios_type &) | __pf | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | ios_base &(*)(ios_base &) | __pf | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | unsigned long | __n | ) | [inline, inherited] |
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::operator<< | ( | short | __n | ) | [inherited] |
Basic arithmetic inserters.
A | variable of builtin type. |
*this
if successfulThese functions use the stream's current locale (specifically, the num_get
facet) to perform numeric formatting.
Definition at line 94 of file ostream.tcc.
References std::ios_base::basefield, std::ios_base::flags(), std::ios_base::hex, and std::ios_base::oct.
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::operator<< | ( | int | __n | ) | [inherited] |
Basic arithmetic inserters.
A | variable of builtin type. |
*this
if successfulThese functions use the stream's current locale (specifically, the num_get
facet) to perform numeric formatting.
Definition at line 108 of file ostream.tcc.
References std::ios_base::basefield, std::ios_base::flags(), std::ios_base::hex, and std::ios_base::oct.
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | long long | __n | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | const void * | __p | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | double | __f | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | long double | __f | ) | [inline, inherited] |
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::operator<< | ( | __streambuf_type * | __sb | ) | [inherited] |
Extracting from another streambuf.
sb | A pointer to a streambuf |
This function behaves like one of the basic arithmetic extractors, in that it also constructs a sentry object and has the same error handling behavior.
If sb is NULL, the stream will set failbit in its error state.
Characters are extracted from sb and inserted into *this
until one of the following occurs:
If the function inserts no characters, failbit is set.
Definition at line 122 of file ostream.tcc.
References std::ios_base::badbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | long | __n | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | unsigned int | __n | ) | [inline, inherited] |
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< | ( | unsigned long long | __n | ) | [inline, inherited] |
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::operator>> | ( | short & | __n | ) | [inherited] |
Basic arithmetic extractors.
A | variable of builtin type. |
*this
if successfulThese functions use the stream's current locale (specifically, the num_get
facet) to parse the input data.
Definition at line 116 of file istream.tcc.
References std::ios_base::badbit, std::ios_base::failbit, std::num_get< _CharT, _InIter >::get(), std::ios_base::goodbit, and std::basic_ios< _CharT, _Traits >::setstate().
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | bool & | __n | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | float & | __f | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | ios_base &(*)(ios_base &) | __pf | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | double & | __f | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | long double & | __f | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | unsigned short & | __n | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | long & | __n | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | void *& | __p | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | long long & | __n | ) | [inline, inherited] |
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::operator>> | ( | int & | __n | ) | [inherited] |
Basic arithmetic extractors.
A | variable of builtin type. |
*this
if successfulThese functions use the stream's current locale (specifically, the num_get
facet) to parse the input data.
Definition at line 161 of file istream.tcc.
References std::ios_base::badbit, std::ios_base::failbit, std::num_get< _CharT, _InIter >::get(), std::ios_base::goodbit, and std::basic_ios< _CharT, _Traits >::setstate().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::operator>> | ( | __streambuf_type * | __sb | ) | [inherited] |
Extracting into another streambuf.
sb | A pointer to a streambuf |
This function behaves like one of the basic arithmetic extractors, in that it also constructs a sentry object and has the same error handling behavior.
If sb is NULL, the stream will set failbit in its error state.
Characters are extracted from this stream and inserted into the sb streambuf until one of the following occurs:
If the function inserts no characters, failbit is set.
Definition at line 206 of file istream.tcc.
References std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | unsigned int & | __n | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | __istream_type &(*)(__istream_type &) | __pf | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | __ios_type &(*)(__ios_type &) | __pf | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | unsigned long & | __n | ) | [inline, inherited] |
__istream_type& std::basic_istream< _CharT, _Traits >::operator>> | ( | unsigned long long & | __n | ) | [inline, inherited] |
basic_istream< _CharT, _Traits >::int_type std::basic_istream< _CharT, _Traits >::peek | ( | void | ) | [inherited] |
Looking ahead in the stream.
If, after constructing the sentry object, good()
is false, returns traits::eof()
. Otherwise reads but does not extract the next input character.
Definition at line 622 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
streamsize std::ios_base::precision | ( | ) | const [inline, inherited] |
Flags access.
Be careful if you try to give a definition of precision here; see DR 189.
Definition at line 623 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::operator<<().
streamsize std::ios_base::precision | ( | streamsize | __prec | ) | [inline, inherited] |
Changing flags.
prec | The new precision value. |
Definition at line 632 of file ios_base.h.
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::put | ( | char_type | __c | ) | [inherited] |
Simple insertion.
c | The character to insert. |
Tries to insert c.
Definition at line 151 of file ostream.tcc.
References std::ios_base::badbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
Referenced by std::endl(), and std::ends().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::putback | ( | char_type | __c | ) | [inherited] |
Unextracting a single character.
c | The character to push back into the input stream. |
If rdbuf()
is not null, calls rdbuf()->sputbackc(c)
.
If rdbuf()
is null or if sputbackc()
fails, sets badbit in the error state.
gcount()
will return 0, as required by DR 60. Definition at line 713 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::clear(), std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::rdstate(), std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_streambuf< _CharT, _Traits >::sputbackc().
Referenced by std::operator>>().
void*& std::ios_base::pword | ( | int | __ix | ) | [inline, inherited] |
Access to void pointer array.
__ix | Index into the array. |
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 764 of file ios_base.h.
__stringbuf_type* std::basic_stringstream< _CharT, _Traits, _Alloc >::rdbuf | ( | ) | const [inline] |
Accessing the underlying buffer.
This hides both signatures of std::basic_ios::rdbuf().
Reimplemented from std::basic_ios< _CharT, _Traits >.
basic_streambuf< _CharT, _Traits > * std::basic_ios< _CharT, _Traits >::rdbuf | ( | basic_streambuf< _CharT, _Traits > * | __sb | ) | [inherited] |
Changing the underlying buffer.
sb | The new stream buffer. |
Associates a new buffer with the current stream, and clears the error state.
Due to historical accidents which the LWG refuses to correct, the I/O library suffers from a design error: this function is hidden in derived classes by overrides of the zero-argument rdbuf()
, which is non-virtual for hysterical raisins. As a result, you must use explicit qualifications to access this function via any derived class. For example:
std::fstream foo; // or some other derived type std::streambuf* p = .....; foo.ios::rdbuf(p); // ios == basic_ios<char>
Definition at line 54 of file basic_ios.tcc.
References std::basic_ios< _CharT, _Traits >::clear().
iostate std::basic_ios< _CharT, _Traits >::rdstate | ( | ) | const [inline, inherited] |
Returns the error state of the stream buffer.
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 129 of file basic_ios.h.
Referenced by std::basic_ios< char, _Traits >::bad(), std::basic_ios< _CharT, _Traits >::clear(), std::basic_ios< char, _Traits >::eof(), std::basic_ios< char, _Traits >::fail(), std::basic_ios< char, _Traits >::good(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ios< char, _Traits >::setstate(), and std::basic_istream< _CharT, _Traits >::unget().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::read | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inherited] |
Extraction without delimiters.
s | A character array. | |
n | Maximum number of characters to store. |
If the stream state is good()
, extracts characters and stores them into s until one of the following happens:
failbit|eofbit
.Definition at line 652 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::failbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
streamsize std::basic_istream< _CharT, _Traits >::readsome | ( | char_type * | __s, | |
streamsize | __n | |||
) | [inherited] |
Extraction until the buffer is exhausted, but no more.
s | A character array. | |
n | Maximum number of characters to store. |
Extracts characters and stores them into s depending on the number of characters remaining in the streambuf's buffer, rdbuf()->in_avail()
, called A
here:
A
==
-1
, sets eofbit and extracts no charactersA
==
0
, extracts no charactersA
>
0
, extracts min(A,n)
The goal is to empty the current buffer, and to not request any more from the external input sequence controlled by the streambuf.
Definition at line 681 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::ios_base::eofbit, std::ios_base::goodbit, std::min(), std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
void std::ios_base::register_callback | ( | event_callback | __fn, | |
int | __index | |||
) | [inherited] |
Add the callback __fn with parameter __index.
__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.
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::seekg | ( | off_type | __off, | |
ios_base::seekdir | __dir | |||
) | [inherited] |
Changing the current read position.
off | A file offset object. | |
dir | The direction in which to seek. |
If fail()
is not true, calls rdbuf()->pubseekoff(off,dir)
. If that function fails, sets failbit.
gcount()
. Definition at line 886 of file istream.tcc.
References std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::clear(), std::ios_base::eofbit, std::basic_ios< _CharT, _Traits >::fail(), std::ios_base::failbit, std::ios_base::goodbit, std::ios_base::in, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::rdstate(), and std::basic_ios< _CharT, _Traits >::setstate().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::seekg | ( | pos_type | __pos | ) | [inherited] |
Changing the current read position.
pos | A file position object. |
If fail()
is not true, calls rdbuf()->pubseekpos(pos)
. If that function fails, sets failbit.
gcount()
. Definition at line 847 of file istream.tcc.
References std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::clear(), std::ios_base::eofbit, std::basic_ios< _CharT, _Traits >::fail(), std::ios_base::failbit, std::ios_base::goodbit, std::ios_base::in, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::rdstate(), and std::basic_ios< _CharT, _Traits >::setstate().
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::seekp | ( | off_type | __off, | |
ios_base::seekdir | __dir | |||
) | [inherited] |
Changing the current write position.
off | A file offset object. | |
dir | The direction in which to seek. |
If fail()
is not true, calls rdbuf()->pubseekoff(off,dir)
. If that function fails, sets failbit.
Definition at line 292 of file ostream.tcc.
References std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::fail(), std::ios_base::failbit, std::ios_base::goodbit, std::ios_base::out, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::seekp | ( | pos_type | __pos | ) | [inherited] |
Changing the current write position.
pos | A file position object. |
If fail()
is not true, calls rdbuf()->pubseekpos(pos)
. If that function fails, sets failbit.
Definition at line 260 of file ostream.tcc.
References std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::fail(), std::ios_base::failbit, std::ios_base::goodbit, std::ios_base::out, std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
Setting new format flags.
fmtfl | Additional flags to set. |
This function sets additional flags in format control. Flags that were previously set remain set.
Definition at line 580 of file ios_base.h.
Referenced by std::dec(), std::fixed(), std::hex(), std::left(), std::oct(), std::right(), std::scientific(), std::showbase(), std::showpoint(), std::showpos(), std::skipws(), std::unitbuf(), and std::uppercase().
Setting new format flags.
fmtfl | Additional flags to set. | |
mask | The flags mask for fmtfl. |
This function clears mask in the format flags, then sets fmtfl &
mask. An example mask is ios_base::adjustfield
.
Definition at line 597 of file ios_base.h.
void std::basic_ios< _CharT, _Traits >::setstate | ( | iostate | __state | ) | [inline, inherited] |
Sets additional flags in the error state.
state | The additional state flag(s) to set. |
See std::ios_base::iostate for the possible bit values.
Definition at line 149 of file basic_ios.h.
Referenced by std::basic_ostream< char >::_M_write(), std::basic_fstream< _CharT, _Traits >::close(), std::basic_ofstream< _CharT, _Traits >::close(), std::basic_ifstream< _CharT, _Traits >::close(), std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_fstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::basic_istream< _CharT, _Traits >::operator>>(), std::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_ostream< _CharT, _Traits >::sentry::sentry(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::basic_istream< _CharT, _Traits >::sync(), std::basic_istream< _CharT, _Traits >::unget(), and std::ws().
__string_type std::basic_stringstream< _CharT, _Traits, _Alloc >::str | ( | ) | const [inline] |
void std::basic_stringstream< _CharT, _Traits, _Alloc >::str | ( | const __string_type & | __s | ) | [inline] |
int std::basic_istream< _CharT, _Traits >::sync | ( | void | ) | [inherited] |
Synchronizing the stream buffer.
If rdbuf()
is a null pointer, returns -1.
Otherwise, calls rdbuf()->pubsync()
, and if that returns -1, sets badbit and returns -1.
Otherwise, returns 0.
gcount()
. Definition at line 783 of file istream.tcc.
References std::ios_base::badbit, std::ios_base::goodbit, std::basic_streambuf< _CharT, _Traits >::pubsync(), std::basic_ios< _CharT, _Traits >::rdbuf(), and std::basic_ios< _CharT, _Traits >::setstate().
static bool std::ios_base::sync_with_stdio | ( | bool | __sync = true |
) | [static, inherited] |
Interaction with the standard C I/O objects.
sync | Whether to synchronize or not. |
The synchronization referred to is only that between the standard C facilities (e.g., stdout) and the standard C++ objects (e.g., cout). User-declared streams are unaffected. See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch28s02.html
basic_istream< _CharT, _Traits >::pos_type std::basic_istream< _CharT, _Traits >::tellg | ( | void | ) | [inherited] |
Getting the current read position.
If fail()
is not false, returns pos_type
(-1) to indicate failure. Otherwise returns rdbuf()->pubseekoff(0,cur,in)
.
gcount()
. Definition at line 819 of file istream.tcc.
References std::ios_base::badbit, std::ios_base::cur, std::basic_ios< _CharT, _Traits >::fail(), std::ios_base::in, and std::basic_ios< _CharT, _Traits >::rdbuf().
basic_ostream< _CharT, _Traits >::pos_type std::basic_ostream< _CharT, _Traits >::tellp | ( | ) | [inherited] |
Getting the current write position.
If fail()
is not false, returns pos_type
(-1) to indicate failure. Otherwise returns rdbuf()->pubseekoff(0,cur,out)
.
Definition at line 239 of file ostream.tcc.
References std::ios_base::badbit, std::ios_base::cur, std::basic_ios< _CharT, _Traits >::fail(), std::ios_base::out, and std::basic_ios< _CharT, _Traits >::rdbuf().
basic_ostream<_CharT, _Traits>* std::basic_ios< _CharT, _Traits >::tie | ( | basic_ostream< _CharT, _Traits > * | __tiestr | ) | [inline, inherited] |
Ties this stream to an output stream.
tiestr | The output stream. |
This sets up a new tie; see tie() for more.
Definition at line 299 of file basic_ios.h.
basic_ostream<_CharT, _Traits>* std::basic_ios< _CharT, _Traits >::tie | ( | ) | const [inline, inherited] |
Fetches the current tied stream.
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 287 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
basic_istream< _CharT, _Traits > & std::basic_istream< _CharT, _Traits >::unget | ( | void | ) | [inherited] |
Unextracting the previous character.
If rdbuf()
is not null, calls rdbuf()->sungetc(c)
.
If rdbuf()
is null or if sungetc()
fails, sets badbit in the error state.
gcount()
will return 0, as required by DR 60. Definition at line 748 of file istream.tcc.
References std::basic_istream< _CharT, _Traits >::_M_gcount, std::ios_base::badbit, std::basic_ios< _CharT, _Traits >::clear(), std::basic_ios< _CharT, _Traits >::eof(), std::ios_base::eofbit, std::ios_base::goodbit, std::basic_ios< _CharT, _Traits >::rdbuf(), std::basic_ios< _CharT, _Traits >::rdstate(), std::basic_ios< _CharT, _Traits >::setstate(), and std::basic_streambuf< _CharT, _Traits >::sungetc().
void std::ios_base::unsetf | ( | fmtflags | __mask | ) | [inline, inherited] |
Clearing format flags.
mask | The flags to unset. |
This function clears mask in the format flags.
Definition at line 612 of file ios_base.h.
Referenced by std::noboolalpha(), std::noshowbase(), std::noshowpoint(), std::noshowpos(), std::noskipws(), std::nounitbuf(), and std::nouppercase().
char_type std::basic_ios< _CharT, _Traits >::widen | ( | char | __c | ) | const [inline, inherited] |
Widens characters.
c | The character to widen. |
Maps a character of char
to a character of char_type
.
Returns the result of
Additional l10n notes are at http://gcc.gnu.org/onlinedocs/libstdc++/manual/localization.html
Definition at line 441 of file basic_ios.h.
Referenced by std::endl(), std::basic_ios< char, _Traits >::fill(), std::basic_istream< char >::get(), std::basic_istream< char >::getline(), std::getline(), and std::operator>>().
streamsize std::ios_base::width | ( | streamsize | __wide | ) | [inline, inherited] |
Changing flags.
wide | The new width value. |
Definition at line 655 of file ios_base.h.
streamsize std::ios_base::width | ( | ) | const [inline, inherited] |
Flags access.
Minimum field width refers to the number of characters.
Definition at line 646 of file ios_base.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), std::num_put< _CharT, _OutIter >::do_put(), and std::operator>>().
__ostream_type& std::basic_ostream< _CharT, _Traits >::write | ( | const char_type * | __s, | |
streamsize | __n | |||
) | [inherited] |
Character string insertion.
s | The array to insert. | |
n | Maximum number of characters to insert. |
Characters are copied from s and inserted into the stream until one of the following happens:
static int std::ios_base::xalloc | ( | ) | throw () [static, inherited] |
Access to unique indices.
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.
streamsize std::basic_istream< _CharT, _Traits >::_M_gcount [protected, inherited] |
The number of characters extracted in the previous unformatted function; see gcount().
Definition at line 81 of file istream.
Referenced by std::basic_istream< char >::gcount(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::unget(), and std::basic_istream< char >::~basic_istream().
const fmtflags std::ios_base::adjustfield [static, inherited] |
A mask of left|right|internal. Useful for the 2-arg form of setf
.
Definition at line 312 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put(), std::internal(), std::left(), and std::right().
const openmode std::ios_base::app [static, inherited] |
Seek to end before each write.
Definition at line 366 of file ios_base.h.
const openmode std::ios_base::ate [static, inherited] |
Open and seek to end immediately after opening.
Definition at line 369 of file ios_base.h.
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).
Definition at line 336 of file ios_base.h.
Referenced by std::basic_ostream< char >::_M_write(), std::basic_ios< char, _Traits >::bad(), std::basic_ios< _CharT, _Traits >::clear(), std::basic_ios< char, _Traits >::fail(), std::basic_ostream< _CharT, _Traits >::flush(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_ios< _CharT, _Traits >::init(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::operator<<(), std::operator>>(), std::basic_istream< _CharT, _Traits >::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::sync(), std::basic_istream< _CharT, _Traits >::tellg(), std::basic_ostream< _CharT, _Traits >::tellp(), std::basic_istream< _CharT, _Traits >::unget(), and std::basic_ostream< _CharT, _Traits >::sentry::~sentry().
const fmtflags std::ios_base::basefield [static, inherited] |
A mask of dec|oct|hex. Useful for the 2-arg form of setf
.
Definition at line 315 of file ios_base.h.
Referenced by std::dec(), std::num_get< _CharT, _InIter >::do_get(), std::hex(), std::oct(), and std::basic_ostream< _CharT, _Traits >::operator<<().
const seekdir std::ios_base::beg [static, inherited] |
Request a seek relative to the beginning of the stream.
Definition at line 398 of file ios_base.h.
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 /// http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch27s02.html.
Definition at line 374 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::showmanyc().
const fmtflags std::ios_base::boolalpha [static, inherited] |
Insert/extract bool
in alphabetic rather than numeric format.
Definition at line 260 of file ios_base.h.
Referenced by std::boolalpha(), std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), and std::noboolalpha().
const seekdir std::ios_base::cur [static, inherited] |
Request a seek relative to the current position within the sequence.
Definition at line 401 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_istream< _CharT, _Traits >::tellg(), and std::basic_ostream< _CharT, _Traits >::tellp().
const fmtflags std::ios_base::dec [static, inherited] |
Converts integer input or generates integer output in decimal base.
Definition at line 263 of file ios_base.h.
Referenced by std::dec().
const seekdir std::ios_base::end [static, inherited] |
Request a seek relative to the current end of the sequence.
Definition at line 404 of file ios_base.h.
Referenced by std::basic_filebuf< _CharT, _Traits >::open().
const iostate std::ios_base::eofbit [static, inherited] |
Indicates that an input operation reached the end of an input sequence.
Definition at line 339 of file ios_base.h.
Referenced by 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::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::operator>>(), std::basic_istream< _CharT, _Traits >::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), 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 >::sentry::sentry(), 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.
Definition at line 344 of file ios_base.h.
Referenced by std::basic_fstream< _CharT, _Traits >::close(), std::basic_ofstream< _CharT, _Traits >::close(), std::basic_ifstream< _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::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_fstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::basic_istream< _CharT, _Traits >::operator>>(), std::operator>>(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
const fmtflags std::ios_base::fixed [static, inherited] |
Generate floating-point output in fixed-point notation.
Definition at line 266 of file ios_base.h.
Referenced by std::fixed().
const fmtflags std::ios_base::floatfield [static, inherited] |
A mask of scientific|fixed. Useful for the 2-arg form of setf
.
Definition at line 318 of file ios_base.h.
Referenced by std::fixed(), and std::scientific().
const iostate std::ios_base::goodbit [static, inherited] |
Indicates all is well.
Definition at line 347 of file ios_base.h.
Referenced by 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 >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_ios< _CharT, _Traits >::init(), std::basic_ostream< _CharT, _Traits >::operator<<(), std::operator>>(), std::basic_istream< _CharT, _Traits >::operator>>(), std::basic_istream< _CharT, _Traits >::peek(), std::basic_ostream< _CharT, _Traits >::put(), std::basic_istream< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::read(), std::basic_istream< _CharT, _Traits >::readsome(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ostream< _CharT, _Traits >::seekp(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), std::basic_istream< _CharT, _Traits >::sync(), and std::basic_istream< _CharT, _Traits >::unget().
const fmtflags std::ios_base::hex [static, inherited] |
Converts integer input or generates integer output in hexadecimal base.
Definition at line 269 of file ios_base.h.
Referenced by std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), std::hex(), and std::basic_ostream< _CharT, _Traits >::operator<<().
const openmode std::ios_base::in [static, inherited] |
Open for input. Default for ifstream
and fstream.
Definition at line 377 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_istream< _CharT, _Traits >::seekg(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_istream< _CharT, _Traits >::tellg(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), and std::basic_filebuf< _CharT, _Traits >::underflow().
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.
Definition at line 274 of file ios_base.h.
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.).
Definition at line 278 of file ios_base.h.
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.
Definition at line 281 of file ios_base.h.
Referenced by std::oct(), and std::basic_ostream< _CharT, _Traits >::operator<<().
const openmode std::ios_base::out [static, inherited] |
Open for output. Default for ofstream
and fstream.
Definition at line 380 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_ostream< _CharT, _Traits >::seekp(), and std::basic_ostream< _CharT, _Traits >::tellp().
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.).
Definition at line 285 of file ios_base.h.
Referenced by std::right().
const fmtflags std::ios_base::scientific [static, inherited] |
Generates floating-point output in scientific notation.
Definition at line 288 of file ios_base.h.
Referenced by std::scientific().
const fmtflags std::ios_base::showbase [static, inherited] |
Generates a prefix indicating the numeric base of generated integer /// output.
Definition at line 292 of file ios_base.h.
Referenced by std::noshowbase(), and std::showbase().
const fmtflags std::ios_base::showpoint [static, inherited] |
Generates a decimal-point character unconditionally in generated /// floating-point output.
Definition at line 296 of file ios_base.h.
Referenced by std::noshowpoint(), and std::showpoint().
const fmtflags std::ios_base::showpos [static, inherited] |
Generates a + sign in non-negative generated numeric output.
Definition at line 299 of file ios_base.h.
Referenced by std::noshowpos(), and std::showpos().
const fmtflags std::ios_base::skipws [static, inherited] |
Skips leading white space before certain input operations.
Definition at line 302 of file ios_base.h.
Referenced by std::noskipws(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), and std::skipws().
const openmode std::ios_base::trunc [static, inherited] |
Open for input. Default for ofstream
.
Definition at line 383 of file ios_base.h.
const fmtflags std::ios_base::unitbuf [static, inherited] |
Flushes output after each output operation.
Definition at line 305 of file ios_base.h.
Referenced by std::nounitbuf(), std::unitbuf(), and std::basic_ostream< _CharT, _Traits >::sentry::~sentry().
const fmtflags std::ios_base::uppercase [static, inherited] |
Replaces certain lowercase letters with their uppercase equivalents /// in generated output.
Definition at line 309 of file ios_base.h.
Referenced by std::num_put< _CharT, _OutIter >::do_put(), std::nouppercase(), and std::uppercase().