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void | __safe_gbump (streamsize __n) |
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void | __safe_pbump (streamsize __n) |
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void | _M_pbump (char_type *__pbeg, char_type *__pend, off_type __off) |
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void | _M_stringbuf_init (ios_base::openmode __mode) |
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void | _M_sync (char_type *__base, __size_type __i, __size_type __o) |
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void | _M_update_egptr () |
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| void | gbump (int __n) |
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| virtual void | imbue (const locale &__loc) |
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| virtual int_type | overflow (int_type __c=traits_type::eof()) |
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| virtual int_type | pbackfail (int_type __c=traits_type::eof()) |
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| void | pbump (int __n) |
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| virtual pos_type | seekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| virtual pos_type | seekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| virtual __streambuf_type * | setbuf (char_type *__s, streamsize __n) |
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| void | setg (char_type *__gbeg, char_type *__gnext, char_type *__gend) |
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| void | setp (char_type *__pbeg, char_type *__pend) |
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| virtual streamsize | showmanyc () |
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void | swap (basic_streambuf &__sb) |
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| virtual int | sync () |
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| virtual int_type | uflow () |
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| virtual int_type | underflow () |
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| virtual streamsize | xsgetn (char_type *__s, streamsize __n) |
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| virtual streamsize | xsputn (const char_type *__s, streamsize __n) |
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| char_type * | eback () const |
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| char_type * | gptr () const |
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| char_type * | egptr () const |
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| char_type * | pbase () const |
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| char_type * | pptr () const |
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| char_type * | epptr () const |
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template<typename _CharT, typename _Traits, typename _Alloc>
class std::basic_stringbuf< _CharT, _Traits, _Alloc >
The actual work of input and output (for std::string).
- Template Parameters
-
| _CharT | Type of character stream. |
| _Traits | Traits for character type, defaults to char_traits<_CharT>. |
| _Alloc | Allocator type, defaults to allocator<_CharT>. |
This class associates either or both of its input and output sequences with a sequence of characters, which can be initialized from, or made available as, a std::basic_string. (Paraphrased from [27.7.1]/1.)
For this class, open modes (of type ios_base::openmode) have in set if the input sequence can be read, and out set if the output sequence can be written.
Definition at line 72 of file sstream.
template<typename _CharT , typename _Traits >
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inlineprotectedvirtualinherited |
template<typename _CharT , typename _Traits >
Looking ahead into the stream.
- Returns
- The number of characters available.
If a read position is available, returns the number of characters available for reading before the buffer must be refilled. Otherwise returns the derived showmanyc().
Definition at line 289 of file streambuf.
template<class _CharT , class _Traits , class _Alloc >
Consumes data from the buffer; writes to the controlled sequence.
- Parameters
-
| __c | An additional character to consume. |
- Returns
- eof() to indicate failure, something else (usually __c, or not_eof())
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).
- Note
- Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 79 of file sstream.tcc.
References __gnu_debug::__base(), std::basic_string< _CharT, _Traits, _Alloc >::assign(), std::ios_base::in, std::max(), std::min(), std::ios_base::out, std::basic_string< _CharT, _Traits, _Alloc >::push_back(), and std::basic_string< _CharT, _Traits, _Alloc >::reserve().
template<class _CharT , class _Traits , class _Alloc >
Tries to back up the input sequence.
- Parameters
-
| __c | The character to be inserted back into the sequence. |
- Returns
- eof() on failure, some other value on success
- Postcondition
- The constraints of
gptr(), eback(), and pptr() are the same as for underflow().
- Note
- Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 45 of file sstream.tcc.
References std::ios_base::out.
template<typename _CharT , typename _Traits >
Getting the next character.
- Returns
- The next character, or eof.
If the input read position is available, returns that character and increments the read pointer, otherwise calls and returns uflow().
Definition at line 321 of file streambuf.
template<class _CharT , class _Traits , class _Alloc >
template<class _CharT , class _Traits , class _Alloc >
template<typename _CharT , typename _Traits >
Getting the next character.
- Returns
- The next character, or eof.
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 343 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc >
Investigating the data available.
- Returns
- An estimate of the number of characters available in the input sequence, or -1.
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
- Note
- Base class version does nothing, returns zero.
-
The standard adds that the intention is not only that the calls [to underflow or uflow] will not return
eof() but that they will return immediately.
-
The standard adds that the morphemes of
showmanyc are es-how-many-see, not show-manic.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 336 of file sstream.
template<typename _CharT , typename _Traits >
template<typename _CharT , typename _Traits >
Pushing characters back into the input stream.
- Parameters
-
| __c | The character to push back. |
- Returns
- The previous character, if possible.
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 377 of file streambuf.
template<typename _CharT , typename _Traits >
Entry point for all single-character output functions.
- Parameters
-
| __c | A character to output. |
- Returns
- __c, if possible.
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 429 of file streambuf.
Referenced by std::ostreambuf_iterator< _CharT, _Traits >::operator=().
template<typename _CharT , typename _Traits >
Entry point for all single-character output functions.
- Parameters
-
| __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 455 of file streambuf.
template<typename _CharT , typename _Traits , typename _Alloc >
Copying out the string buffer.
- Returns
- A copy of one of the underlying sequences.
If the buffer is only created in input mode, the underlying character sequence is equal to the input sequence; otherwise, it is equal to the output sequence. [27.7.1.2]/1
Definition at line 242 of file sstream.
template<typename _CharT , typename _Traits >
Moving backwards in the input stream.
- Returns
- The previous character, if possible.
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 402 of file streambuf.
template<typename _CharT , typename _Traits >
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inlineprotectedvirtualinherited |
Synchronizes the buffer arrays with the controlled sequences.
- Returns
- -1 on failure.
Each derived class provides its own appropriate behavior, including the definition of failure.
- Note
- Base class version does nothing, returns zero.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, std::char_traits< _CharT > >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< char_type, traits_type >, __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >, and std::wbuffer_convert< _Codecvt, _Elem, _Tr >.
Definition at line 632 of file streambuf.
template<typename _CharT , typename _Traits >
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inlineprotectedvirtualinherited |
Fetches more data from the controlled sequence.
- Returns
- The first character from the pending 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 705 of file streambuf.
template<class _CharT , class _Traits , class _Alloc >
Fetches more data from the controlled sequence.
- Returns
- The first character from the pending 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
- Note
- Base class version does nothing, returns eof().
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 149 of file sstream.tcc.
References std::ios_base::in.
template<typename _CharT , typename _Traits >
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protectedvirtualinherited |
template<typename _CharT , typename _Traits >
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protectedvirtualinherited |
1.9.1