libstdc++
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Public Types | |
typedef _CharT | char_type |
typedef _Traits | traits_type |
typedef traits_type::int_type | int_type |
typedef traits_type::pos_type | pos_type |
typedef traits_type::off_type | off_type |
typedef basic_streambuf< char_type, traits_type > | __streambuf_type |
Public Member Functions | |
virtual | ~basic_streambuf () |
locale | getloc () const |
streamsize | in_avail () |
locale | pubimbue (const locale &__loc) |
int_type | sbumpc () |
int_type | sgetc () |
streamsize | sgetn (char_type *__s, streamsize __n) |
int_type | snextc () |
int_type | sputbackc (char_type __c) |
int_type | sputc (char_type __c) |
streamsize | sputn (const char_type *__s, streamsize __n) |
int_type | sungetc () |
basic_streambuf * | pubsetbuf (char_type *__s, streamsize __n) |
pos_type | pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out) |
pos_type | pubseekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out) |
int | pubsync () |
Protected Attributes | |
locale | _M_buf_locale |
char_type * | _M_in_beg |
char_type * | _M_in_cur |
char_type * | _M_in_end |
char_type * | _M_out_beg |
char_type * | _M_out_cur |
char_type * | _M_out_end |
Friends | |
template<bool _IsMove, typename _CharT2 > | |
__gnu_cxx::__enable_if< __is_char< _CharT2 >::__value, _CharT2 * >::__type | __copy_move_a2 (istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >, _CharT2 *) |
streamsize | __copy_streambufs_eof (basic_streambuf *, basic_streambuf *, bool &) |
class | basic_ios< char_type, traits_type > |
class | basic_istream< char_type, traits_type > |
class | basic_ostream< char_type, traits_type > |
template<typename _CharT2 > | |
__gnu_cxx::__enable_if< __is_char< _CharT2 >::__value, istreambuf_iterator< _CharT2 > >::__type | find (istreambuf_iterator< _CharT2 >, istreambuf_iterator< _CharT2 >, const _CharT2 &) |
template<typename _CharT2 , typename _Traits2 , typename _Alloc > | |
basic_istream< _CharT2, _Traits2 > & | getline (basic_istream< _CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &, _CharT2) |
class | istreambuf_iterator< char_type, traits_type > |
template<typename _CharT2 , typename _Traits2 > | |
basic_istream< _CharT2, _Traits2 > & | operator>> (basic_istream< _CharT2, _Traits2 > &, _CharT2 *) |
template<typename _CharT2 , typename _Traits2 , typename _Alloc > | |
basic_istream< _CharT2, _Traits2 > & | operator>> (basic_istream< _CharT2, _Traits2 > &, basic_string< _CharT2, _Traits2, _Alloc > &) |
class | ostreambuf_iterator< char_type, traits_type > |
The actual work of input and output (interface).
_CharT | Type of character stream. |
_Traits | Traits for character type, defaults to char_traits<_CharT>. |
This is a base class. Derived stream buffers each control a pair of character sequences: one for input, and one for output.
Section [27.5.1] of the standard describes the requirements and behavior of stream buffer classes. That section (three paragraphs) is reproduced here, for simplicity and accuracy.
charT
array object. The array object represents, at any moment, a (sub)sequence of characters from the sequence. Operations performed on a sequence alter the values stored in these pointers, perform reads and writes directly to or from associated sequences, and alter the stream position and conversion state as needed to maintain this subsequence relationship. The three pointers are:charT
array, as described above; otherwise, xbeg and xend shall also be null.typedef basic_streambuf<char_type, traits_type> std::basic_streambuf< _CharT, _Traits >::__streambuf_type |
typedef _CharT std::basic_streambuf< _CharT, _Traits >::char_type |
typedef traits_type::int_type std::basic_streambuf< _CharT, _Traits >::int_type |
typedef traits_type::off_type std::basic_streambuf< _CharT, _Traits >::off_type |
typedef traits_type::pos_type std::basic_streambuf< _CharT, _Traits >::pos_type |
typedef _Traits std::basic_streambuf< _CharT, _Traits >::traits_type |
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Base constructor.
Only called from derived constructors, and sets up all the buffer data to zero, including the pointers described in the basic_streambuf class description. Note that, as a result,
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Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 482 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
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Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 488 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::failed(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
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Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 535 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::xsputn().
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Moving the read position.
__n | The delta by which to move. |
This just advances the read position without returning any data.
Definition at line 498 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::pbackfail(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
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Access to the get area.
These functions are only available to other protected functions, including derived classes.
Definition at line 485 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::failed(), std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
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Changes translations.
__loc | A new locale. |
Translations done during I/O which depend on the current locale are changed by this call. The standard adds, Between invocations of this function a class derived from streambuf can safely cache results of calls to locale functions and to members of facets so obtained.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf< char_type, traits_type >.
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Consumes data from the buffer; writes to the controlled sequence.
__c | An additional character to consume. |
Informally, this function is called when the output buffer is full (or does not exist, as buffering need not actually be done). If a buffer exists, it is consumed, with some effect on the controlled sequence. (Typically, the buffer is written out to the sequence verbatim.) In either case, the character c is also written out, if __c is not eof()
.
For a formal definition of this function, see a good text such as Langer & Kreft, or [27.5.2.4.5]/3-7.
A functioning output streambuf can be created by overriding only this function (no buffer area will be used).
Reimplemented in std::wbuffer_convert< _Codecvt, _Elem, _Tr >, std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, std::basic_stringbuf< _CharT, _Traits, _Alloc >, and __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
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Tries to back up the input sequence.
__c | The character to be inserted back into the sequence. |
gptr()
, eback()
, and pptr()
are the same as for underflow()
.Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, std::basic_stringbuf< _CharT, _Traits, _Alloc >, and __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
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Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 529 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::sync(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
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Moving the write position.
__n | The delta by which to move. |
This just advances the write position without returning any data.
Definition at line 545 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::overflow().
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Access to the put area.
These functions are only available to other protected functions, including derived classes.
Definition at line 532 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_filebuf< _CharT, _Traits >::seekpos(), std::basic_filebuf< _CharT, _Traits >::sync(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
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Calls virtual sync function.
Definition at line 271 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::sync().
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Getting the next character.
If the input read position is available, returns that character and increments the read pointer, otherwise calls and returns uflow()
.
Definition at line 316 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), and std::istreambuf_iterator< _CharT, _Traits >::operator++().
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Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type
that represents an invalid stream position. Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits, _Alloc >.
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Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type
that represents an invalid stream position. Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits, _Alloc >.
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Manipulates the buffer.
Each derived class provides its own appropriate behavior. See the next-to-last paragraph of https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering for more on this function.
this
. Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits, _Alloc >.
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Setting the three read area pointers.
__gbeg | A pointer. |
__gnext | A pointer. |
__gend | A pointer. |
eback()
, __gnext == gptr()
, and __gend == egptr()
Definition at line 509 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::xsgetn().
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Getting the next character.
If the input read position is available, returns that character, otherwise calls and returns underflow()
. Does not move the read position after fetching the character.
Definition at line 338 of file streambuf.
Referenced by std::istreambuf_iterator< _CharT, _Traits >::equal(), std::ostreambuf_iterator< _CharT, _Traits >::failed(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), and std::basic_streambuf< _CharT, _Traits >::xsputn().
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Investigating the data available.
If it returns a positive value, then successive calls to underflow()
will not return traits::eof()
until at least that number of characters have been supplied. If showmanyc()
returns -1, then calls to underflow()
or uflow()
will fail. [27.5.2.4.3]/1
eof()
but that they will return immediately. showmanyc
are es-how-many-see, not show-manic. Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, and std::basic_stringbuf< _CharT, _Traits, _Alloc >.
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Getting the next character.
Calls sbumpc()
, and if that function returns traits::eof()
, so does this function. Otherwise, sgetc()
.
Definition at line 298 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::failed(), std::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), std::basic_istream< _CharT, _Traits >::sentry::sentry(), and std::basic_streambuf< _CharT, _Traits >::xsputn().
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Pushing characters back into the input stream.
__c | The character to push back. |
Similar to sungetc(), but __c is pushed onto the stream instead of the previous character. If successful, the next character fetched from the input stream will be __c.
Definition at line 372 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::putback().
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Entry point for all single-character output functions.
__c | A character to output. |
One of two public output functions.
If a write position is available for the output sequence (i.e., the buffer is not full), stores __c in that position, increments the position, and returns traits::to_int_type(__c)
. If a write position is not available, returns overflow(__c)
.
Definition at line 424 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::get(), std::ostreambuf_iterator< _CharT, _Traits >::operator=(), and std::basic_streambuf< _CharT, _Traits >::xsputn().
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Entry point for all single-character output functions.
__s | A buffer read area. |
__n | A count. |
One of two public output functions.
Returns xsputn(__s,__n). The effect is to write __s[0] through __s[__n-1] to the output sequence, if possible.
Definition at line 450 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::failed().
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Moving backwards in the input stream.
If a putback position is available, this function decrements the input pointer and returns that character. Otherwise, calls and returns pbackfail(). The effect is to unget the last character gotten.
Definition at line 397 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::unget().
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Synchronizes the buffer arrays with the controlled sequences.
Each derived class provides its own appropriate behavior, including the definition of failure.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, std::wbuffer_convert< _Codecvt, _Elem, _Tr >, and __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
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Fetches more data from the controlled sequence.
Informally, this function does the same thing as underflow()
, and in fact is required to call that function. It also returns the new character, like underflow()
does. However, this function also moves the read position forward by one.
Reimplemented in __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
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Fetches more data from the controlled sequence.
Informally, this function is called when the input buffer is exhausted (or does not exist, as buffering need not actually be done). If a buffer exists, it is refilled. In either case, the next available character is returned, or traits::eof()
to indicate a null pending sequence.
For a formal definition of the pending sequence, see a good text such as Langer & Kreft, or [27.5.2.4.3]/7-14.
A functioning input streambuf can be created by overriding only this function (no buffer area will be used). For an example, see https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html
Reimplemented in std::wbuffer_convert< _Codecvt, _Elem, _Tr >, std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, std::basic_stringbuf< _CharT, _Traits, _Alloc >, and __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >.
Definition at line 687 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::failed().
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Multiple character extraction.
__s | A buffer area. |
__n | Maximum number of characters to assign. |
Fills __s[0] through __s[__n-1] with characters from the input sequence, as if by sbumpc()
. Stops when either __n characters have been copied, or when traits::eof()
would be copied.
It is expected that derived classes provide a more efficient implementation by overriding this definition.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf< char_type, traits_type >.
Definition at line 46 of file streambuf.tcc.
References std::min(), and std::basic_streambuf< _CharT, _Traits >::xsputn().
Referenced by std::basic_filebuf< _CharT, _Traits >::xsgetn().
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Multiple character insertion.
__s | A buffer area. |
__n | Maximum number of characters to write. |
Writes __s[0] through __s[__n-1] to the output sequence, as if by sputc()
. Stops when either n characters have been copied, or when sputc()
would return traits::eof()
.
It is expected that derived classes provide a more efficient implementation by overriding this definition.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, and std::basic_filebuf< char_type, traits_type >.
Definition at line 80 of file streambuf.tcc.
References std::min(), std::basic_streambuf< _CharT, _Traits >::sgetc(), std::basic_streambuf< _CharT, _Traits >::snextc(), and std::basic_streambuf< _CharT, _Traits >::sputc().
Referenced by std::basic_streambuf< _CharT, _Traits >::xsgetn(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
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Current locale setting.
Definition at line 192 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::basic_filebuf().
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