- Generated by
1.8.5
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libstdc++
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Public Types | |
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typedef codecvt< char_type, char, __state_type > | __codecvt_type |
| typedef __basic_file< char > | __file_type |
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typedef basic_filebuf < char_type, traits_type > | __filebuf_type |
| typedef traits_type::state_type | __state_type |
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typedef basic_streambuf < char_type, traits_type > | __streambuf_type |
| typedef _CharT | char_type |
| typedef traits_type::int_type | int_type |
| typedef traits_type::off_type | off_type |
| typedef traits_type::pos_type | pos_type |
| typedef _Traits | traits_type |
Public Member Functions | |
| basic_filebuf () | |
| virtual | ~basic_filebuf () |
| __filebuf_type * | close () |
| locale | getloc () const |
| streamsize | in_avail () |
| bool | is_open () const throw () |
| __filebuf_type * | open (const char *__s, ios_base::openmode __mode) |
| __filebuf_type * | open (const std::string &__s, ios_base::openmode __mode) |
| 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 Member Functions | |
| void | __safe_gbump (streamsize __n) |
| void | __safe_pbump (streamsize __n) |
| void | _M_allocate_internal_buffer () |
| bool | _M_convert_to_external (char_type *, streamsize) |
| void | _M_create_pback () |
| void | _M_destroy_internal_buffer () throw () |
| void | _M_destroy_pback () throw () |
| int | _M_get_ext_pos (__state_type &__state) |
| pos_type | _M_seek (off_type __off, ios_base::seekdir __way, __state_type __state) |
| void | _M_set_buffer (streamsize __off) |
| bool | _M_terminate_output () |
| void | gbump (int __n) |
| virtual void | imbue (const locale &__loc) |
| virtual int_type | overflow (int_type __c=_Traits::eof()) |
| virtual int_type | pbackfail (int_type __c=_Traits::eof()) |
| void | pbump (int __n) |
| virtual pos_type | seekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out) |
| virtual pos_type | seekpos (pos_type __pos, ios_base::openmode __mode=ios_base::in|ios_base::out) |
| virtual __streambuf_type * | setbuf (char_type *__s, streamsize __n) |
| void | setg (char_type *__gbeg, char_type *__gnext, char_type *__gend) |
| void | setp (char_type *__pbeg, char_type *__pend) |
| virtual streamsize | showmanyc () |
| virtual int | sync () |
| virtual int_type return | traits_type::eof () |
| virtual int_type | uflow () |
| virtual int_type | underflow () |
| virtual streamsize | xsgetn (char_type *__s, streamsize __n) |
| virtual streamsize | xsputn (const char_type *__s, streamsize __n) |
| char_type * | eback () const |
| char_type * | gptr () const |
| char_type * | egptr () const |
| char_type * | pbase () const |
| char_type * | pptr () const |
| char_type * | epptr () const |
Protected Attributes | |
| char_type * | _M_buf |
| bool | _M_buf_allocated |
| locale | _M_buf_locale |
| size_t | _M_buf_size |
| const __codecvt_type * | _M_codecvt |
| char * | _M_ext_buf |
| streamsize | _M_ext_buf_size |
| char * | _M_ext_end |
| const char * | _M_ext_next |
| __file_type | _M_file |
| char_type * | _M_in_beg |
| char_type * | _M_in_cur |
| char_type * | _M_in_end |
| __c_lock | _M_lock |
| ios_base::openmode | _M_mode |
| char_type * | _M_out_beg |
| char_type * | _M_out_cur |
| char_type * | _M_out_end |
| bool | _M_reading |
| __state_type | _M_state_beg |
| __state_type | _M_state_cur |
| __state_type | _M_state_last |
| bool | _M_writing |
| char_type | _M_pback |
| char_type * | _M_pback_cur_save |
| char_type * | _M_pback_end_save |
| bool | _M_pback_init |
Friends | |
| class | ios_base |
The actual work of input and output (for files).
| _CharT | Type of character stream. |
| _Traits | Traits for character type, defaults to char_traits<_CharT>. |
This class associates both its input and output sequence with an external disk file, and maintains a joint file position for both sequences. Many of its semantics are described in terms of similar behavior in the Standard C Library's FILE streams.
Requirements on traits_type, specific to this class:
| std::basic_filebuf< _CharT, _Traits >::basic_filebuf | ( | ) |
Does not open any files.
The default constructor initializes the parent class using its own default ctor.
Definition at line 79 of file fstream.tcc.
References std::basic_streambuf< _CharT, _Traits >::_M_buf_locale.
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inlinevirtual |
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inlineprotected |
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inlineprotected | |||||||||||||
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inlineprotected |
This function sets the pointers of the internal buffer, both get and put areas. Typically:
__off == egptr() - eback() upon underflow/uflow (read mode); __off == 0 upon overflow (write mode); __off == -1 upon open, setbuf, seekoff/pos (uncommitted mode).
NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size reflects the actual allocated memory and the last cell is reserved for the overflow char of a full put area.
| basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::close | ( | ) |
Closes the currently associated file.
this on success, NULL on failureIf no file is currently open, this function immediately fails.
If a put buffer area exists, overflow(eof) is called to flush all the characters. The file is then closed.
If any operations fail, this function also fails.
Definition at line 128 of file fstream.tcc.
Referenced by std::basic_ifstream< _CharT, _Traits >::close(), std::basic_ofstream< _CharT, _Traits >::close(), std::basic_fstream< _CharT, _Traits >::close(), and std::basic_filebuf< char_type, traits_type >::~basic_filebuf().
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inlineprotectedinherited |
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< char_type, traits_type >::_M_destroy_pback(), std::basic_streambuf< char, char_traits< char > >::sputbackc(), and std::basic_streambuf< char, char_traits< char > >::sungetc().
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inlineprotectedinherited |
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::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_streambuf< char, char_traits< char > >::in_avail(), std::basic_streambuf< char, char_traits< char > >::sbumpc(), std::basic_streambuf< char, char_traits< char > >::sgetc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
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inlineprotectedinherited |
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_streambuf< char, char_traits< char > >::sputc().
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inlineprotectedinherited |
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_streambuf< char, char_traits< char > >::sbumpc(), std::basic_streambuf< char, char_traits< char > >::sputbackc(), std::basic_streambuf< char, char_traits< char > >::sungetc(), and std::basic_streambuf< char, char_traits< char > >::uflow().
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inlineinherited |
Locale access.
If pubimbue(loc) has been called, then the most recent loc is returned. Otherwise the global locale in effect at the time of construction is returned.
Definition at line 226 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pubimbue().
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inlineprotectedinherited |
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::basic_filebuf< char_type, traits_type >::_M_create_pback(), std::basic_filebuf< char_type, traits_type >::_M_destroy_pback(), std::basic_streambuf< char, char_traits< char > >::in_avail(), std::basic_streambuf< char, char_traits< char > >::sbumpc(), std::basic_streambuf< char, char_traits< char > >::sgetc(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::showmanyc(), std::basic_streambuf< char, char_traits< char > >::sputbackc(), std::basic_streambuf< char, char_traits< char > >::sungetc(), and std::basic_streambuf< char, char_traits< char > >::uflow().
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protectedvirtual |
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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 912 of file fstream.tcc.
References std::ios_base::cur.
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inlineinherited |
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Returns true if the external file is open.
Definition at line 227 of file fstream.
Referenced by std::basic_ifstream< _CharT, _Traits >::is_open(), std::basic_ofstream< _CharT, _Traits >::is_open(), and std::basic_fstream< _CharT, _Traits >::is_open().
| basic_filebuf< _CharT, _Traits >::__filebuf_type * std::basic_filebuf< _CharT, _Traits >::open | ( | const char * | __s, |
| ios_base::openmode | __mode | ||
| ) |
Opens an external file.
| __s | The name of the file. |
| __mode | The open mode flags. |
this on success, NULL on failureIf a file is already open, this function immediately fails. Otherwise it tries to open the file named __s using the flags given in __mode.
Table 92, adapted here, gives the relation between openmode combinations and the equivalent fopen() flags. (NB: lines app, in|out|app, in|app, binary|app, binary|in|out|app, and binary|in|app per DR 596)
+---------------------------------------------------------+ | ios_base Flag combination stdio equivalent | |binary in out trunc app | +---------------------------------------------------------+ | + w | | + + a | | + a | | + + w | | + r | | + + r+ | | + + + w+ | | + + + a+ | | + + a+ | +---------------------------------------------------------+ | + + wb | | + + + ab | | + + ab | | + + + wb | | + + rb | | + + + r+b | | + + + + w+b | | + + + + a+b | | + + + a+b | +---------------------------------------------------------+
Definition at line 94 of file fstream.tcc.
References std::ios_base::ate, std::ios_base::end, and std::basic_filebuf< _CharT, _Traits >::open().
Referenced by std::basic_filebuf< _CharT, _Traits >::open(), std::basic_filebuf< char_type, traits_type >::open(), std::basic_ifstream< _CharT, _Traits >::open(), std::basic_ofstream< _CharT, _Traits >::open(), and std::basic_fstream< _CharT, _Traits >::open().
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inline |
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inlineprotectedinherited |
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_stringbuf< _CharT, _Traits, _Alloc >::str().
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inlineprotectedinherited |
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_streambuf< char, char_traits< char > >::sputc().
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inlineprotectedinherited |
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_streambuf< char, char_traits< char > >::sputc(), and std::basic_stringbuf< _CharT, _Traits, _Alloc >::str().
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inlineinherited |
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inlineinherited |
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inlineinherited |
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inlineinherited |
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inlineinherited |
Calls virtual sync function.
Definition at line 271 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::sync().
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inlineinherited |
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(), std::istreambuf_iterator< _CharT, _Traits >::operator++(), and std::basic_streambuf< char, char_traits< char > >::snextc().
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protectedvirtual |
Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type that represents an invalid stream position. Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 715 of file fstream.tcc.
References std::ios_base::cur.
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protectedvirtual |
Alters the stream positions.
Each derived class provides its own appropriate behavior.
pos_type that represents an invalid stream position. Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 775 of file fstream.tcc.
References std::ios_base::beg.
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protectedvirtual |
Manipulates the buffer.
| __s | Pointer to a buffer area. |
| __n | Size of __s. |
this If no file has been opened, and both __s and __n are zero, then the stream becomes unbuffered. Otherwise, __s is used as a buffer; see http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html for more.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 686 of file fstream.tcc.
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inlineprotectedinherited |
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< char_type, traits_type >::_M_create_pback(), std::basic_filebuf< char_type, traits_type >::_M_destroy_pback(), and std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
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inlineprotectedinherited |
Setting the three write area pointers.
| __pbeg | A pointer. |
| __pend | A pointer. |
pbase(), __pbeg == pptr(), and __pend == epptr() Definition at line 555 of file streambuf.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
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inlineinherited |
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::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< char, char_traits< char > >::snextc().
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inlineinherited |
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protectedvirtual |
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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 178 of file fstream.tcc.
References std::ios_base::binary, and std::ios_base::in.
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inlineinherited |
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::basic_istream< _CharT, _Traits >::get(), std::basic_istream< _CharT, _Traits >::getline(), std::basic_istream< _CharT, _Traits >::ignore(), and std::basic_istream< _CharT, _Traits >::sentry::sentry().
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inlineinherited |
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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inlineinherited |
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(), and std::ostreambuf_iterator< _CharT, _Traits >::operator=().
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inlineinherited |
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inlineinherited |
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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protectedvirtual |
Synchronizes the buffer arrays with the controlled sequences.
Each derived class provides its own appropriate behavior, including the definition of failure.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 895 of file fstream.tcc.
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protectedvirtualinherited |
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().
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inlineprotectedvirtualinherited |
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 >.
Definition at line 700 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::sbumpc().
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protectedvirtual |
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 http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25.html
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 204 of file fstream.tcc.
References std::ios_base::in, and std::min().
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protectedvirtual |
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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 550 of file fstream.tcc.
References std::ios_base::in.
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protectedvirtual |
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 from std::basic_streambuf< _CharT, _Traits >.
Definition at line 638 of file fstream.tcc.
References std::ios_base::app, std::min(), and std::ios_base::out.
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protected |
Pointer to the beginning of internal buffer.
Definition at line 114 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_destroy_pback(), and std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
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protectedinherited |
Current locale setting.
Definition at line 192 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::basic_filebuf(), std::basic_streambuf< char, char_traits< char > >::getloc(), and std::basic_streambuf< char, char_traits< char > >::pubimbue().
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protected |
Actual size of internal buffer. This number is equal to the size of the put area + 1 position, reserved for the overflow char of a full area.
Definition at line 121 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
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protected |
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protected |
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protected |
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protectedinherited |
Start of get area.
Definition at line 184 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::eback(), and std::basic_streambuf< char, char_traits< char > >::setg().
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protectedinherited |
Current read area.
Definition at line 185 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::gbump(), std::basic_streambuf< char, char_traits< char > >::gptr(), and std::basic_streambuf< char, char_traits< char > >::setg().
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protectedinherited |
End of get area.
Definition at line 186 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::egptr(), and std::basic_streambuf< char, char_traits< char > >::setg().
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Place to stash in || out || in | out settings for current filebuf.
Definition at line 99 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_set_buffer().
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protectedinherited |
Start of put area.
Definition at line 187 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pbase(), and std::basic_streambuf< char, char_traits< char > >::setp().
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protectedinherited |
Current put area.
Definition at line 188 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::pbump(), std::basic_streambuf< char, char_traits< char > >::pptr(), and std::basic_streambuf< char, char_traits< char > >::setp().
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protectedinherited |
End of put area.
Definition at line 189 of file streambuf.
Referenced by std::basic_streambuf< char, char_traits< char > >::epptr(), and std::basic_streambuf< char, char_traits< char > >::setp().
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protected |
Necessary bits for putback buffer management.
Definition at line 142 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback().
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protected |
Necessary bits for putback buffer management.
Definition at line 143 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), and std::basic_filebuf< char_type, traits_type >::_M_destroy_pback().
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protected |
Necessary bits for putback buffer management.
Definition at line 144 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), and std::basic_filebuf< char_type, traits_type >::_M_destroy_pback().
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protected |
Necessary bits for putback buffer management.
Definition at line 145 of file fstream.
Referenced by std::basic_filebuf< char_type, traits_type >::_M_create_pback(), and std::basic_filebuf< char_type, traits_type >::_M_destroy_pback().
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1.8.5