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| | basic_stringbuf () |
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| | basic_stringbuf (__string_type &&__s, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| | basic_stringbuf (basic_stringbuf &&__rhs) |
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| | basic_stringbuf (basic_stringbuf &&__rhs, const allocator_type &__a) |
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| | basic_stringbuf (const __string_type &__str, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| | basic_stringbuf (const allocator_type &__a) |
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| template<typename _SAlloc> |
| | basic_stringbuf (const basic_string< _CharT, _Traits, _SAlloc > &__s, const allocator_type &__a) |
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| template<typename _SAlloc> |
| | basic_stringbuf (const basic_string< _CharT, _Traits, _SAlloc > &__s, ios_base::openmode __mode, const allocator_type &__a) |
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| template<typename _SAlloc> |
| | basic_stringbuf (const basic_string< _CharT, _Traits, _SAlloc > &__s, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| basic_stringbuf (const basic_stringbuf &)=delete |
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| | basic_stringbuf (ios_base::openmode __mode) |
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| | basic_stringbuf (ios_base::openmode __mode, const allocator_type &__a) |
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| allocator_type | get_allocator () const noexcept |
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| locale | getloc () const |
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| streamsize | in_avail () |
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| basic_stringbuf & | operator= (basic_stringbuf &&__rhs) |
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basic_stringbuf & | operator= (const basic_stringbuf &)=delete |
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| locale | pubimbue (const locale &__loc) |
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| int_type | sbumpc () |
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| int_type | sgetc () |
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| streamsize | sgetn (char_type *__s, streamsize __n) |
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| int_type | snextc () |
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| int_type | sputbackc (char_type __c) |
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| int_type | sputc (char_type __c) |
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| streamsize | sputn (const char_type *__s, streamsize __n) |
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| __string_type | str () && |
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| __string_type | str () const & |
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| void | str (__string_type &&__s) |
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| void | str (const __string_type &__s) |
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| template<__allocator_like _SAlloc> |
| basic_string< _CharT, _Traits, _SAlloc > | str (const _SAlloc &__sa) const |
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template<__allocator_like _SAlloc>
requires (!is_same_v<_SAlloc, _Alloc>) |
| void | str (const basic_string< _CharT, _Traits, _SAlloc > &__s) |
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| int_type | sungetc () |
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| void | swap (basic_stringbuf &__rhs) noexcept(_Noexcept_swap::value) |
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| basic_string_view< char_type, traits_type > | view () const noexcept |
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| basic_streambuf * | pubsetbuf (char_type *__s, streamsize __n) |
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| pos_type | pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| pos_type | pubseekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out) |
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| int | pubsync () |
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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 87 of file sstream.
template<typename _CharT, typename _Traits>
Access to the get area.
These functions are only available to other protected functions, including derived classes.
- eback() returns the beginning pointer for the input sequence
- gptr() returns the next pointer for the input sequence
- egptr() returns the end pointer for the input sequence
Definition at line 491 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::underflow(), and std::basic_filebuf< _CharT, _Traits >::xsgetn().
template<typename _CharT, typename _Traits>
Access to the get area.
These functions are only available to other protected functions, including derived classes.
- eback() returns the beginning pointer for the input sequence
- gptr() returns the next pointer for the input sequence
- egptr() returns the end pointer for the input sequence
Definition at line 497 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::wbuffer_convert< _Codecvt, _Elem, _Tr >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and xsgetn().
template<typename _CharT, typename _Traits>
Access to the put area.
These functions are only available to other protected functions, including derived classes.
- pbase() returns the beginning pointer for the output sequence
- pptr() returns the next pointer for the output sequence
- epptr() returns the end pointer for the output sequence
Definition at line 544 of file streambuf.
Referenced by std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::xsputn(), and xsputn().
template<typename _CharT, typename _Traits>
Access to the get area.
These functions are only available to other protected functions, including derived classes.
- eback() returns the beginning pointer for the input sequence
- gptr() returns the next pointer for the input sequence
- egptr() returns the end pointer for the input sequence
Definition at line 494 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::imbue(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::pbackfail(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::showmanyc(), std::basic_filebuf< _CharT, _Traits >::underflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::underflow(), std::wbuffer_convert< _Codecvt, _Elem, _Tr >::underflow(), std::basic_filebuf< _CharT, _Traits >::xsgetn(), and xsgetn().
template<typename _CharT, typename _Traits>
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inlineprotectedvirtualinherited |
Changes translations.
- Parameters
-
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.
- Note
- Base class version does nothing.
Reimplemented in std::basic_filebuf< _CharT, _Traits >, std::basic_filebuf< _CharT, encoding_char_traits< _CharT > >, std::basic_filebuf< _CharT, std::char_traits< _CharT > >, std::basic_filebuf< char >, std::basic_filebuf< char >, std::basic_filebuf< char_type, traits_type >, std::basic_filebuf< char_type, traits_type >, std::basic_filebuf< wchar_t >, and std::basic_filebuf< wchar_t >.
Definition at line 585 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 83 of file sstream.tcc.
References _M_mode, std::basic_string< _CharT, _Traits, _Alloc >::assign(), std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::epptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), std::ios_base::in, std::max(), std::min(), std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), std::basic_streambuf< _CharT, _Traits >::pbump(), std::basic_streambuf< _CharT, _Traits >::pptr(), std::basic_string< _CharT, _Traits, _Alloc >::push_back(), std::basic_string< _CharT, _Traits, _Alloc >::reserve(), and std::basic_streambuf< _CharT, _Traits >::setg().
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 49 of file sstream.tcc.
References _M_mode, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::gbump(), std::basic_streambuf< _CharT, _Traits >::gptr(), and std::ios_base::out.
template<typename _CharT, typename _Traits>
Access to the put area.
These functions are only available to other protected functions, including derived classes.
- pbase() returns the beginning pointer for the output sequence
- pptr() returns the next pointer for the output sequence
- epptr() returns the end pointer for the output sequence
Definition at line 538 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekpos(), std::basic_filebuf< _CharT, _Traits >::sync(), and std::basic_filebuf< _CharT, _Traits >::xsputn().
template<typename _CharT, typename _Traits>
Access to the put area.
These functions are only available to other protected functions, including derived classes.
- pbase() returns the beginning pointer for the output sequence
- pptr() returns the next pointer for the output sequence
- epptr() returns the end pointer for the output sequence
Definition at line 541 of file streambuf.
Referenced by std::basic_filebuf< _CharT, _Traits >::overflow(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::overflow(), std::basic_filebuf< _CharT, _Traits >::seekoff(), std::basic_stringbuf< _CharT, _Traits, _Alloc >::seekoff(), std::basic_filebuf< _CharT, _Traits >::sync(), std::basic_filebuf< _CharT, _Traits >::xsputn(), and xsputn().
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 325 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::getline().
template<class _CharT, class _Traits, class _Alloc>
Alters the stream positions.
Each derived class provides its own appropriate behavior.
- Note
- Base class version does nothing, returns a
pos_type that represents an invalid stream position.
Reimplemented from std::basic_streambuf< _CharT, _Traits >.
Definition at line 219 of file sstream.tcc.
References _M_mode, std::basic_streambuf< _CharT, _Traits >::eback(), std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::epptr(), std::ios_base::in, std::ios_base::out, std::basic_streambuf< _CharT, _Traits >::pbase(), and std::basic_streambuf< _CharT, _Traits >::setg().
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 347 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 >::ignore().
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 401 of file sstream.
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 381 of file streambuf.
Referenced by std::basic_istream< _CharT, _Traits >::putback().
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 433 of file streambuf.
Referenced by std::wbuffer_convert< _Codecvt, _Elem, _Tr >::overflow().
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 459 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 287 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 406 of file streambuf.
Referenced by std::basic_istream< char_type, traits_type >::sentry::sentry().
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 709 of file streambuf.
Referenced by xsgetn().
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 153 of file sstream.tcc.
References _M_mode, std::basic_streambuf< _CharT, _Traits >::egptr(), std::basic_streambuf< _CharT, _Traits >::gptr(), and std::ios_base::in.
template<typename _CharT, typename _Traits>
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protectedvirtualinherited |
Multiple character extraction.
- Parameters
-
| __s | A buffer area. |
| __n | Maximum number of characters to assign. |
- Returns
- The number of characters assigned.
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 > >, std::basic_filebuf< _CharT, std::char_traits< _CharT > >, std::basic_filebuf< char >, std::basic_filebuf< char >, std::basic_filebuf< char_type, traits_type >, std::basic_filebuf< char_type, traits_type >, and std::basic_filebuf< wchar_t >.
Definition at line 50 of file streambuf.tcc.
References egptr(), gptr(), std::min(), and uflow().
template<typename _CharT, typename _Traits>
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protectedvirtualinherited |
Multiple character insertion.
- Parameters
-
| __s | A buffer area. |
| __n | Maximum number of characters to write. |
- Returns
- The number of characters written.
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 > >, std::basic_filebuf< _CharT, std::char_traits< _CharT > >, std::basic_filebuf< char >, std::basic_filebuf< char >, std::basic_filebuf< char_type, traits_type >, std::basic_filebuf< char_type, traits_type >, and std::basic_filebuf< wchar_t >.
Definition at line 84 of file streambuf.tcc.
References epptr(), std::min(), overflow(), and pptr().
1.13.2