std::basic_spanbuf is a std::basic_streambuf whose associated character sequence is a memory-resident sequence of arbitrary characters, which can be initialized from or made available as an instance of std::span<CharT>.
std::basic_spanbuf performs I/O on a fixed buffer, and therefore it does not attempt to obtain a new buffer when the underlying buffer is exhausted.
Several typedefs for common character types are provided:
Type Definitionstd::spanbuf std::basic_spanbuf<char> std::wspanbuf std::basic_spanbuf<wchar_t> [edit] Member types Member type Definition char_type CharT[edit] traits_type Traits; the program is ill-formed if Traits::char_type is not CharT.[edit] int_type Traits::int_type[edit] pos_type Traits::pos_type[edit] off_type Traits::off_type[edit] [edit] Data members Member name Definition mod (private) A std::ios_base::openmode recording the open mode.
buf (private) A std::span<CharT> referencing the underlying buffer.
basic_spanbuf object
basic_spanbuf object
basic_spanbuf object
basic_spanbuf objects
char_type CharT[edit] traits_type Traits; the program is ill-formed if Traits::char_type is not CharT.[edit] int_type Traits::int_type[edit] pos_type Traits::pos_type[edit] off_type Traits::off_type[edit] Member functions destructs the basic_streambuf object
std::basic_streambuf<CharT,Traits>) [edit] Locales changes the associated locale and invokes imbue()
std::basic_streambuf<CharT,Traits>) [edit] obtains a copy of the associated locale
std::basic_streambuf<CharT,Traits>) [edit] Positioning invokes setbuf()
std::basic_streambuf<CharT,Traits>) [edit] invokes seekoff()
std::basic_streambuf<CharT,Traits>) [edit] invokes seekpos()
std::basic_streambuf<CharT,Traits>) [edit] invokes sync()
std::basic_streambuf<CharT,Traits>) [edit] Get area obtains the number of characters immediately available in the get area
std::basic_streambuf<CharT,Traits>) [edit] advances the input sequence, then reads one character without advancing again
std::basic_streambuf<CharT,Traits>) [edit] reads one character from the input sequence and advances the sequence
std::basic_streambuf<CharT,Traits>) [edit] reads one character from the input sequence without advancing the sequence
std::basic_streambuf<CharT,Traits>) [edit] invokes xsgetn()
std::basic_streambuf<CharT,Traits>) [edit] Put area writes one character to the put area and advances the next pointer
std::basic_streambuf<CharT,Traits>) [edit] invokes xsputn()
std::basic_streambuf<CharT,Traits>) [edit] Putback puts one character back in the input sequence
std::basic_streambuf<CharT,Traits>) [edit] moves the next pointer in the input sequence back by one
std::basic_streambuf<CharT,Traits>) [edit] Protected member functions constructs a basic_streambuf object
basic_streambuf object
basic_streambuf objects
std::basic_streambuf<CharT,Traits>) [edit] Positioning replaces the buffer with user-defined array, if permitted
std::basic_streambuf<CharT,Traits>) [edit] repositions the next pointer in the input sequence, output sequence, or both, using relative addressing
std::basic_streambuf<CharT,Traits>) [edit] repositions the next pointer in the input sequence, output sequence, or both using absolute addressing
std::basic_streambuf<CharT,Traits>) [edit] synchronizes the buffers with the associated character sequence
std::basic_streambuf<CharT,Traits>) [edit] Get area obtains the number of characters available for input in the associated input sequence, if known
std::basic_streambuf<CharT,Traits>) [edit] reads characters from the associated input sequence to the get area
std::basic_streambuf<CharT,Traits>) [edit] reads characters from the associated input sequence to the get area and advances the next pointer
std::basic_streambuf<CharT,Traits>) [edit] reads multiple characters from the input sequence
std::basic_streambuf<CharT,Traits>) [edit] returns a pointer to the beginning, current character and the end of the get area
std::basic_streambuf<CharT,Traits>) [edit] writes characters to the associated output sequence from the put area
std::basic_streambuf<CharT,Traits>) [edit] returns a pointer to the beginning, current character and the end of the put area
std::basic_streambuf<CharT,Traits>) [edit] [edit] Notes
std::basic_spanbuf does not own the underlying buffer.
It is the responsibility of programmers to ensure the underlying buffer is in its lifetime when used by a std::basic_spanbuf object. Additional synchronization may be needed if more than one thread operates the same underlying buffer through different std::basic_spanbuf objects.
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