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