std::basic_spanbuf<CharT,Traits>::setbuf
From cppreference.com
< cpp | io | basic spanbuf
|
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
Example
| This section is incomplete Reason: no 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) |