std::basic_spanbuf<CharT,Traits>::setbuf

 

C++

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Feature test macros (C++20)

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Technical specifications

Symbols index

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Input/output library

I/O manipulators

Print functions (C++23)

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

strstreambuf (C++98/26*)

basic_syncbuf (C++20)

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basic_stringstream

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basic_ispanstream (C++23)

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basic_spanstream (C++23)

istrstream (C++98/26*)

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strstream (C++98/26*)

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basic_osyncstream (C++20)

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streamoff

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iostream_category (C++11)

io_errc (C++11)

 

std::basic_spanbuf

Public member functions

basic_spanbuf::basic_spanbuf (C++23)

basic_spanbuf::operator= (C++23)

basic_spanbuf::swap (C++23)

basic_spanbuf::span (C++23)

Protected member functions

basic_spanbuf::setbuf (C++23)

basic_spanbuf::seekoff (C++23)

basic_spanbuf::seekpos (C++23)

Non-member functions

swap(std::basic_spanbuf) (C++23)

 

protected: std::basic_streambuf<CharT, Traits>* setbuf( CharT *s, std::streamsize n ) override;		(since C++23)

Makes the basic_spanbuf perform I/O on the buffer [s, s + n). Equivalently calls this->span(std::span<CharT>(s, n)) and then returns this.

Set bits in open mode (affecting pointers to get area)	Return value after setting
	eback()	gptr()	egptr()
std::ios_base::in	s	s	s + n
Set bits in open mode (affecting pointers to put area)	Return value after setting
	pbase()	pptr()	epptr()
std::ios_base::out && !std::ios_base::ate	s	s	s + n
std::ios_base::out && std::ios_base::ate	s	s + n	s + n

This function is protected virtual, it may only be called through pubsetbuf() or from member functions of a user-defined class derived from std::basic_spanbuf.

Parameters

s	-	pointer to the first CharT in the user-provided buffer
n	-	the number of CharT elements in the user-provided buffer

Return value

this

Notes

The deprecated stream buffer std::strstreambuf or the boost.IOStreams device boost::basic_array can also implement I/O buffering over a user-provided char array.

Example

See also

pubsetbuf	invokes setbuf() (public member function of std::basic_streambuf<CharT,Traits>)
setbuf [virtual]	attempts to replace the controlled character sequence with an array (virtual protected member function of std::basic_stringbuf<CharT,Traits,Allocator>)
setbuf [virtual]	attempts to replace the controlled character sequence with an array (virtual protected member function of std::strstreambuf)

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