libstdc++
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Public Types | |
typedef ctype< _CharT > | __ctype_type |
typedef num_get< _CharT, istreambuf_iterator< _CharT, _Traits > > | __num_get_type |
typedef num_put< _CharT, ostreambuf_iterator< _CharT, _Traits > > | __num_put_type |
typedef _CharT | char_type |
typedef _Traits::int_type | int_type |
typedef _Traits::off_type | off_type |
typedef _Traits::pos_type | pos_type |
typedef _Traits | traits_type |
Public Member Functions | |
basic_ios (basic_streambuf< _CharT, _Traits > *__sb) | |
virtual | ~basic_ios () |
void | _M_setstate (iostate __state) |
bool | bad () const |
void | clear (iostate __state=goodbit) |
basic_ios & | copyfmt (const basic_ios &__rhs) |
bool | eof () const |
iostate | exceptions () const |
void | exceptions (iostate __except) |
bool | fail () const |
char_type | fill () const |
char_type | fill (char_type __ch) |
bool | good () const |
locale | imbue (const locale &__loc) |
char | narrow (char_type __c, char __dfault) const |
operator bool () const | |
bool | operator! () const |
basic_streambuf< _CharT, _Traits > * | rdbuf () const |
basic_streambuf< _CharT, _Traits > * | rdbuf (basic_streambuf< _CharT, _Traits > *__sb) |
iostate | rdstate () const |
void | setstate (iostate __state) |
basic_ostream< _CharT, _Traits > * | tie () const |
basic_ostream< _CharT, _Traits > * | tie (basic_ostream< _CharT, _Traits > *__tiestr) |
char_type | widen (char __c) const |
Protected Member Functions | |
basic_ios () | |
basic_ios (const basic_ios &)=delete | |
void | _M_cache_locale (const locale &__loc) |
void | init (basic_streambuf< _CharT, _Traits > *__sb) |
void | move (basic_ios &&__rhs) |
void | move (basic_ios &__rhs) |
basic_ios & | operator= (const basic_ios &)=delete |
void | set_rdbuf (basic_streambuf< _CharT, _Traits > *__sb) |
void | swap (basic_ios &__rhs) noexcept |
Protected Attributes | |
const __ctype_type * | _M_ctype |
char_type | _M_fill |
bool | _M_fill_init |
const __num_get_type * | _M_num_get |
const __num_put_type * | _M_num_put |
basic_streambuf< _CharT, _Traits > * | _M_streambuf |
basic_ostream< _CharT, _Traits > * | _M_tie |
Template class basic_ios, virtual base class for all stream classes.
_CharT | Type of character stream. |
_Traits | Traits for character type, defaults to char_traits<_CharT>. |
Most of the member functions called dispatched on stream objects (e.g., std::cout.foo(bar)
;) are consolidated in this class.
typedef ctype<_CharT> std::basic_ios< _CharT, _Traits >::__ctype_type |
These are non-standard types.
Definition at line 87 of file basic_ios.h.
typedef _CharT std::basic_ios< _CharT, _Traits >::char_type |
These are standard types. They permit a standardized way of referring to names of (or names dependent on) the template parameters, which are specific to the implementation.
Definition at line 76 of file basic_ios.h.
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inlineexplicit |
Constructor performs initialization.
The parameter is passed by derived streams.
Definition at line 270 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::init().
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inlinevirtual |
Empty.
The destructor does nothing. More specifically, it does not destroy the streambuf held by rdbuf().
Definition at line 282 of file basic_ios.h.
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inlineprotected |
Empty.
The default constructor does nothing and is not normally accessible to users.
Definition at line 460 of file basic_ios.h.
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inline |
Fast error checking.
Note that other iostate flags may also be set.
Definition at line 211 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::rdstate().
void std::basic_ios< _CharT, _Traits >::clear | ( | iostate | __state = goodbit | ) |
[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 41 of file basic_ios.tcc.
Referenced by std::basic_ios< _CharT, _Traits >::exceptions(), and std::basic_ios< _CharT, _Traits >::setstate().
basic_ios< _CharT, _Traits > & std::basic_ios< _CharT, _Traits >::copyfmt | ( | const basic_ios< _CharT, _Traits > & | __rhs | ) |
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 63 of file basic_ios.tcc.
References std::basic_ios< _CharT, _Traits >::exceptions(), std::basic_ios< _CharT, _Traits >::fill(), std::basic_ios< _CharT, _Traits >::tie(), and std::tie().
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inline |
Fast error checking.
Note that other iostate flags may also be set.
Definition at line 190 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::rdstate().
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inline |
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 222 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt().
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inline |
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:
Definition at line 257 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::clear().
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inline |
Fast error checking.
Checking the badbit in fail() is historical practice. Note that other iostate flags may also be set.
Definition at line 201 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::rdstate().
Referenced by std::basic_ios< _CharT, _Traits >::operator bool().
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inline |
Retrieves the empty character.
It defaults to a space (' ') in the current locale.
Definition at line 370 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::widen().
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt(), and std::basic_ios< _CharT, _Traits >::fill().
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inline |
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 390 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::fill().
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inline |
Fast error checking.
A wrapper around rdstate.
Definition at line 180 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::rdstate().
locale std::basic_ios< _CharT, _Traits >::imbue | ( | const locale & | __loc | ) |
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
Definition at line 114 of file basic_ios.tcc.
References std::ios_base::imbue().
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protected |
All setup is performed here.
This is called from the public constructor. It is not virtual and cannot be redefined.
Definition at line 126 of file basic_ios.tcc.
Referenced by std::basic_ios< _CharT, _Traits >::basic_ios().
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inline |
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 430 of file basic_ios.h.
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inlineexplicit |
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.
References std::basic_ios< _CharT, _Traits >::fail().
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inline |
Accessing the underlying buffer.
This does not change the state of the stream.
Definition at line 321 of file basic_ios.h.
basic_streambuf< _CharT, _Traits > * std::basic_ios< _CharT, _Traits >::rdbuf | ( | basic_streambuf< _CharT, _Traits > * | __sb | ) |
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:
Definition at line 53 of file basic_ios.tcc.
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inline |
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 137 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::bad(), std::basic_ios< _CharT, _Traits >::eof(), std::basic_ios< _CharT, _Traits >::fail(), std::basic_ios< _CharT, _Traits >::good(), and std::basic_ios< _CharT, _Traits >::setstate().
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inline |
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 157 of file basic_ios.h.
References std::basic_ios< _CharT, _Traits >::clear(), and std::basic_ios< _CharT, _Traits >::rdstate().
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inline |
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 295 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::copyfmt().
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inline |
Ties this stream to an output stream.
__tiestr | The output stream. |
This sets up a new tie; see tie() for more.
Definition at line 307 of file basic_ios.h.
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inline |
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 449 of file basic_ios.h.
Referenced by std::basic_ios< _CharT, _Traits >::fill().