libstdc++
std::basic_ofstream< _CharT, _Traits > Class Template Reference
Inheritance diagram for std::basic_ofstream< _CharT, _Traits >:

List of all members.

Public Types

Public Member Functions

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.

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.

Static Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Protected Attributes

Friends


Detailed Description

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

Controlling output for files.

This class supports reading from named files, using the inherited functions from std::basic_ostream. To control the associated sequence, an instance of std::basic_filebuf is used, which this page refers to as sb.

Definition at line 588 of file fstream.


Member Typedef Documentation

template<typename _CharT, typename _Traits>
typedef ctype<_CharT> std::basic_ostream< _CharT, _Traits >::__ctype_type [inherited]

These are non-standard types.

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

Definition at line 72 of file ostream.

template<typename _CharT, typename _Traits>
typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> > std::basic_ios< _CharT, _Traits >::__num_get_type [inherited]

These are non-standard types.

Reimplemented in std::basic_istream< _CharT, _Traits >, std::basic_istream< char, _Traits >, and std::basic_istream< char >.

Definition at line 88 of file basic_ios.h.

template<typename _CharT, typename _Traits>
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 >.

Definition at line 71 of file ostream.

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

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

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

Definition at line 592 of file fstream.

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

The type of an event callback function.

Parameters:
__eOne of the members of the event enum.
__bReference to the ios_base object.
__iThe 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:

  • boolalpha
  • dec
  • fixed
  • hex
  • internal
  • left
  • oct
  • right
  • scientific
  • showbase
  • showpoint
  • showpos
  • skipws
  • unitbuf
  • uppercase
  • adjustfield
  • basefield
  • floatfield

Definition at line 257 of file ios_base.h.

template<typename _CharT , typename _Traits >
typedef traits_type::int_type std::basic_ofstream< _CharT, _Traits >::int_type

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

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

Definition at line 594 of file fstream.

typedef _Ios_Iostate std::ios_base::iostate [inherited]

This is a bitmask type.

_Ios_Iostate is implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type iostate are:

  • badbit
  • eofbit
  • failbit
  • goodbit

Definition at line 332 of file ios_base.h.

template<typename _CharT , typename _Traits >
typedef traits_type::off_type std::basic_ofstream< _CharT, _Traits >::off_type

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

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

Definition at line 596 of file fstream.

typedef _Ios_Openmode std::ios_base::openmode [inherited]

This is a bitmask type.

_Ios_Openmode is implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type openmode are:

  • app
  • ate
  • binary
  • in
  • out
  • trunc

Definition at line 363 of file ios_base.h.

template<typename _CharT , typename _Traits >
typedef traits_type::pos_type std::basic_ofstream< _CharT, _Traits >::pos_type

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

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

Definition at line 595 of file fstream.

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

This is an enumerated type.

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

  • beg
  • cur, equivalent to SEEK_CUR in the C standard library.
  • end, equivalent to SEEK_END in the C standard library.

Definition at line 395 of file ios_base.h.

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

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

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

Definition at line 593 of file fstream.


Member Enumeration Documentation

enum std::ios_base::event [inherited]

The set of events that may be passed to an event callback.

erase_event is used during ~ios() and copyfmt(). imbue_event is used during imbue(). copyfmt_event is used during copyfmt().

Definition at line 421 of file ios_base.h.


Constructor & Destructor Documentation

template<typename _CharT , typename _Traits >
std::basic_ofstream< _CharT, _Traits >::basic_ofstream ( ) [inline]

Default constructor.

Initializes sb using its default constructor, and passes &sb to the base class initializer. Does not open any files (you haven't given it a filename to open).

Definition at line 614 of file fstream.

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

template<typename _CharT , typename _Traits >
std::basic_ofstream< _CharT, _Traits >::basic_ofstream ( const char *  __s,
ios_base::openmode  __mode = ios_base::out|ios_base::trunc 
) [inline, explicit]

Create an output file stream.

Parameters:
__sNull terminated string specifying the filename.
__modeOpen file in specified mode (see std::ios_base).

ios_base::out|ios_base::trunc is automatically included in __mode.

Tip: When using std::string to hold the filename, you must use .c_str() before passing it to this constructor.

Definition at line 629 of file fstream.

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

template<typename _CharT , typename _Traits >
std::basic_ofstream< _CharT, _Traits >::basic_ofstream ( const std::string __s,
ios_base::openmode  __mode = ios_base::out|ios_base::trunc 
) [inline, explicit]

Create an output file stream.

Parameters:
__sstd::string specifying the filename.
__modeOpen file in specified mode (see std::ios_base).

ios_base::out|ios_base::trunc is automatically included in __mode.

Definition at line 647 of file fstream.

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

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

The destructor does nothing.

The file is closed by the filebuf object, not the formatting stream.

Definition at line 662 of file fstream.


Member Function Documentation

template<typename _CharT, typename _Traits>
void std::basic_ostream< _CharT, _Traits >::_M_write ( const char_type __s,
streamsize  __n 
) [inline, inherited]

Core write functionality, without sentry.

Parameters:
__sThe array to insert.
__nMaximum number of characters to insert.

Definition at line 309 of file ostream.

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

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

Fast error checking.

Returns:
True if the badbit is set.

Note that other iostate flags may also be set.

Definition at line 203 of file basic_ios.h.

template<typename _CharT , typename _Traits >
void std::basic_ios< _CharT, _Traits >::clear ( iostate  __state = goodbit) [inherited]
template<typename _CharT , typename _Traits >
void std::basic_ofstream< _CharT, _Traits >::close ( ) [inline]

Close the file.

Calls std::basic_filebuf::close(). If that function fails, failbit is set in the stream's error state.

Definition at line 742 of file fstream.

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

template<typename _CharT , typename _Traits >
basic_ios< _CharT, _Traits > & std::basic_ios< _CharT, _Traits >::copyfmt ( const basic_ios< _CharT, _Traits > &  __rhs) [inherited]

Copies fields of __rhs into this.

Parameters:
__rhsThe source values for the copies.
Returns:
Reference to this object.

All fields of __rhs are copied into this object except that rdbuf() and rdstate() remain unchanged. All values in the pword and iword arrays are copied. Before copying, each callback is invoked with erase_event. After copying, each (new) callback is invoked with copyfmt_event. The final step is to copy exceptions().

Definition at line 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().

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

Throwing exceptions on errors.

Returns:
The current exceptions mask.

This changes nothing in the stream. See the one-argument version of exceptions(iostate) for the meaning of the return value.

Definition at line 214 of file basic_ios.h.

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

template<typename _CharT, typename _Traits>
void std::basic_ios< _CharT, _Traits >::exceptions ( iostate  __except) [inline, inherited]

Throwing exceptions on errors.

Parameters:
__exceptThe 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 (<strong>gnu_cxx::</strong>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.

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

Fast error checking.

Returns:
True if either the badbit or the failbit is set.

Checking the badbit in fail() is historical practice. Note that other iostate flags may also be set.

Definition at line 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().

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

Retrieves the empty character.

Returns:
The current fill 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().

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

Sets a new empty character.

Parameters:
__chThe new character.
Returns:
The previous fill character.

The fill character is used to fill out space when P+ characters have been requested (e.g., via setw), Q characters are actually used, and Q<P. It defaults to a space (' ') in the current locale.

Definition at line 382 of file basic_ios.h.

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

Setting new format flags all at once.

Parameters:
__fmtflThe new flags to set.
Returns:
The previous format control flags.

This function overwrites all the format flags with __fmtfl.

Definition at line 564 of file ios_base.h.

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::flush ( ) [inherited]

Synchronizing the stream buffer.

Returns:
*this

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().

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

Locale access.

Returns:
A copy of the current locale.

If imbue(loc) has previously been called, then this function returns loc. Otherwise, it returns a copy of std::locale(), the global C++ locale.

Definition at line 697 of file ios_base.h.

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

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

Fast error checking.

Returns:
True if no error flags are set.

A wrapper around rdstate.

Definition at line 172 of file basic_ios.h.

Referenced by std::basic_ostream< _CharT, _Traits >::sentry::sentry(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().

template<typename _CharT , typename _Traits >
locale std::basic_ios< _CharT, _Traits >::imbue ( const locale __loc) [inherited]

Moves to a new locale.

Parameters:
__locThe new locale.
Returns:
The previous locale.

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

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

Reimplemented from std::ios_base.

Definition at line 115 of file basic_ios.tcc.

References std::ios_base::imbue().

Referenced by std::operator<<().

template<typename _CharT , typename _Traits >
bool std::basic_ofstream< _CharT, _Traits >::is_open ( ) [inline]

Wrapper to test for an open file.

Returns:
rdbuf()->is_open()

Definition at line 681 of file fstream.

References std::basic_filebuf< _CharT, _Traits >::is_open().

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

Access to integer array.

Parameters:
__ixIndex into the array.
Returns:
A reference to an integer associated with the index.

The iword function provides access to an array of integers that can be used for any purpose. The array grows as required to hold the supplied index. All integers in the array are initialized to 0.

The implementation reserves several indices. You should use xalloc to obtain an index that is safe to use. Also note that since the array can grow dynamically, it is not safe to hold onto the reference.

Definition at line 743 of file ios_base.h.

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

Squeezes characters.

Parameters:
__cThe character to narrow.
__dfaultThe character to narrow.
Returns:
The narrowed character.

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

Returns the result of

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

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

Definition at line 422 of file basic_ios.h.

template<typename _CharT , typename _Traits >
void std::basic_ofstream< _CharT, _Traits >::open ( const char *  __s,
ios_base::openmode  __mode = ios_base::out | ios_base::trunc 
) [inline]

Opens an external file.

Parameters:
__sThe name of the file.
__modeThe open mode flags.

Calls std::basic_filebuf::open(s,mode|out|trunc). If that function fails, failbit is set in the stream's error state.

Tip: When using std::string to hold the filename, you must use .c_str() before passing it to this constructor.

Definition at line 702 of file fstream.

References std::basic_ios< _CharT, _Traits >::clear(), std::ios_base::failbit, std::basic_filebuf< _CharT, _Traits >::open(), std::ios_base::out, and std::basic_ios< _CharT, _Traits >::setstate().

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

template<typename _CharT , typename _Traits >
void std::basic_ofstream< _CharT, _Traits >::open ( const std::string __s,
ios_base::openmode  __mode = ios_base::out | ios_base::trunc 
) [inline]

Opens an external file.

Parameters:
__sThe name of the file.
__modeThe open mode flags.

Calls std::basic_filebuf::open(s,mode|out|trunc). If that function fails, failbit is set in the stream's error state.

Definition at line 723 of file fstream.

References std::basic_ios< _CharT, _Traits >::clear(), std::ios_base::failbit, std::basic_filebuf< _CharT, _Traits >::open(), std::ios_base::out, and std::basic_ios< _CharT, _Traits >::setstate().

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

The quick-and-easy status check.

This allows you to write constructs such as if (!a_stream) ... and while (a_stream) ...

Definition at line 113 of file basic_ios.h.

template<typename _CharT, typename _Traits>
bool std::basic_ios< _CharT, _Traits >::operator! ( ) const [inline, inherited]

The quick-and-easy status check.

This allows you to write constructs such as if (!a_stream) ... and while (a_stream) ...

Definition at line 117 of file basic_ios.h.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( __ostream_type &(*)(__ostream_type &)  __pf) [inline, inherited]

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 106 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( __ios_type &(*)(__ios_type &)  __pf) [inline, inherited]

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 115 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( ios_base &(*)(ios_base &)  __pf) [inline, inherited]

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 125 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( long  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 164 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( unsigned long  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 168 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( bool  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 172 of file ostream.

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::operator<< ( short  __n) [inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These 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.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( unsigned short  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 179 of file ostream.

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::operator<< ( int  __n) [inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These 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.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( unsigned int  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 190 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( long long  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 199 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( unsigned long long  __n) [inline, inherited]

Integer arithmetic inserters.

Parameters:
__nA variable of builtin integral type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 203 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( double  __f) [inline, inherited]

Floating point arithmetic inserters.

Parameters:
__fA variable of builtin floating point type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 218 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( float  __f) [inline, inherited]

Floating point arithmetic inserters.

Parameters:
__fA variable of builtin floating point type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 222 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( long double  __f) [inline, inherited]

Floating point arithmetic inserters.

Parameters:
__fA variable of builtin floating point type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 230 of file ostream.

template<typename _CharT, typename _Traits>
__ostream_type& std::basic_ostream< _CharT, _Traits >::operator<< ( const void *  __p) [inline, inherited]

Pointer arithmetic inserters.

Parameters:
__pA variable of pointer type.
Returns:
*this if successful

These functions use the stream's current locale (specifically, the num_get facet) to perform numeric formatting.

Definition at line 243 of file ostream.

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::operator<< ( __streambuf_type __sb) [inherited]

Extracting from another streambuf.

Parameters:
__sbA 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:

  • the input stream reaches end-of-file,
    • insertion into the output sequence fails (in this case, the character that would have been inserted is not extracted), or
    • an exception occurs while getting a character from __sb, which sets failbit in the error state

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().

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

Flags access.

Returns:
The precision to generate on certain output operations.

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

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.

Parameters:
__precThe new precision value.
Returns:
The previous value of precision().

Definition at line 632 of file ios_base.h.

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::put ( char_type  __c) [inherited]

Simple insertion.

Parameters:
__cThe character to insert.
Returns:
*this

Tries to insert __c.

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

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().

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

Access to void pointer array.

Parameters:
__ixIndex into the array.
Returns:
A reference to a void* associated with the index.

The pword function provides access to an array of pointers that can be used for any purpose. The array grows as required to hold the supplied index. All pointers in the array are initialized to 0.

The implementation reserves several indices. You should use xalloc to obtain an index that is safe to use. Also note that since the array can grow dynamically, it is not safe to hold onto the reference.

Definition at line 764 of file ios_base.h.

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

Changing the underlying buffer.

Parameters:
__sbThe new stream buffer.
Returns:
The previous stream buffer.

Associates a new buffer with the current stream, and clears the error state.

Due to historical accidents which the LWG refuses to correct, the I/O library suffers from a design error: this function is hidden in derived classes by overrides of the zero-argument rdbuf(), which is non-virtual for hysterical raisins. As a result, you must use explicit qualifications to access this function via any derived class. For example:

  std::fstream     foo;         // or some other derived type
  std::streambuf*  p = .....;

  foo.ios::rdbuf(p);            // ios == basic_ios<char>

Definition at line 54 of file basic_ios.tcc.

template<typename _CharT , typename _Traits >
__filebuf_type* std::basic_ofstream< _CharT, _Traits >::rdbuf ( ) const [inline]

Accessing the underlying buffer.

Returns:
The current basic_filebuf buffer.

This hides both signatures of std::basic_ios::rdbuf().

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

Definition at line 673 of file fstream.

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

Returns the error state of the stream buffer.

Returns:
A bit pattern (well, isn't everything?)

See std::ios_base::iostate for the possible bit values. Most users will call one of the interpreting wrappers, e.g., good().

Definition at line 129 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< _CharT, _Traits >::putback(), std::basic_istream< _CharT, _Traits >::seekg(), std::basic_ios< char, _Traits >::setstate(), and std::basic_istream< _CharT, _Traits >::unget().

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

Add the callback __fn with parameter __index.

Parameters:
__fnThe function to add.
__indexThe integer to pass to the function when invoked.

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

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::seekp ( pos_type  __pos) [inherited]

Changing the current write position.

Parameters:
__posA file position object.
Returns:
*this

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().

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::seekp ( off_type  __off,
ios_base::seekdir  __dir 
) [inherited]

Changing the current write position.

Parameters:
__offA file offset object.
__dirThe direction in which to seek.
Returns:
*this

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().

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

Setting new format flags.

Parameters:
__fmtflAdditional flags to set.
Returns:
The previous format control flags.

This function sets additional flags in format control. Flags that were previously set remain set.

Definition at line 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().

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

Setting new format flags.

Parameters:
__fmtflAdditional flags to set.
__maskThe flags mask for fmtfl.
Returns:
The previous format control flags.

This function clears mask in the format flags, then sets fmtfl & mask. An example mask is ios_base::adjustfield.

Definition at line 597 of file ios_base.h.

template<typename _CharT, typename _Traits>
void std::basic_ios< _CharT, _Traits >::setstate ( iostate  __state) [inline, inherited]
static bool std::ios_base::sync_with_stdio ( bool  __sync = true) [static, inherited]

Interaction with the standard C I/O objects.

Parameters:
__syncWhether to synchronize or not.
Returns:
True if the standard streams were previously synchronized.

The synchronization referred to is only that between the standard C facilities (e.g., stdout) and the standard C++ objects (e.g., cout). User-declared streams are unaffected. See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch28s02.html

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits >::pos_type std::basic_ostream< _CharT, _Traits >::tellp ( ) [inherited]

Getting the current write position.

Returns:
A file position object.

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().

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

Fetches the current tied stream.

Returns:
A pointer to the tied stream, or NULL if the stream is not tied.

A stream may be tied (or synchronized) to a second output stream. When this stream performs any I/O, the tied stream is first flushed. For example, std::cin is tied to std::cout.

Definition at line 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().

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

Ties this stream to an output stream.

Parameters:
__tiestrThe output stream.
Returns:
The previously tied output stream, or NULL if the stream was not tied.

This sets up a new tie; see tie() for more.

Definition at line 299 of file basic_ios.h.

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

Clearing format flags.

Parameters:
__maskThe 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().

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

Widens characters.

Parameters:
__cThe character to widen.
Returns:
The widened character.

Maps a character of char to a character of char_type.

Returns the result of

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

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

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(), std::tr2::operator>>(), and std::operator>>().

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

Flags access.

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

Minimum field width refers to the number of characters.

Definition at line 646 of file ios_base.h.

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

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

Changing flags.

Parameters:
__wideThe new width value.
Returns:
The previous value of width().

Definition at line 655 of file ios_base.h.

template<typename _CharT , typename _Traits >
basic_ostream< _CharT, _Traits > & std::basic_ostream< _CharT, _Traits >::write ( const char_type __s,
streamsize  __n 
) [inherited]

Character string insertion.

Parameters:
__sThe array to insert.
__nMaximum number of characters to insert.
Returns:
*this

Characters are copied from __s and inserted into the stream until one of the following happens:

  • __n characters are inserted
    • inserting into the output sequence fails (in this case, badbit will be set in the stream's error state)
Note:
This function is not overloaded on signed char and unsigned char.

Definition at line 185 of file ostream.tcc.

References std::basic_ostream< _CharT, _Traits >::_M_write(), and std::ios_base::badbit.

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

Access to unique indices.

Returns:
An integer different from all previous calls.

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

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


Member Data Documentation

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

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

Definition at line 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 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.

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

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

Perform input and output in binary mode (as opposed to text mode). This is probably not what you think it is; see 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 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(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff().

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 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 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 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().


The documentation for this class was generated from the following file: