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

protected:
pos_type seekpos( pos_type sp, std::ios_base::openmode which =
                      std::ios_base::in | std::ios_base::out ) override;

(since C++23)

Repositions the next pointer to the get and/or put area, if possible, to the position indicated by sp.

Equivalent to return seekoff(off_type(sp), std::ios_base::beg, which);.

sp - stream position, such as one obtained by seekoff() or seekpos()

which

defines whether the input sequences, the output sequence, or both are affected. It can be one or a combination of the following constants:

Constant	Explanation
`in`	affect the input sequence
`out`	affect the output sequence

sp on success or pos_type(off_type(-1)) on failure.

seekpos() is called by std::basic_streambuf::pubseekpos(), which is called by the single-argument versions of std::basic_istream::seekg() and std::basic_ostream::seekp().

pubseekpos	invokes `seekpos()` (public member function of `std::basic_streambuf<CharT,Traits>`)
seekpos [virtual]	repositions the next pointer in the input sequence, output sequence, or both using absolute addressing (virtual protected member function of `std::basic_stringbuf<CharT,Traits,Allocator>`)
seekpos [virtual]	repositions the next pointer in the input sequence, output sequence, or both using absolute addressing (virtual protected member function of `std::strstreambuf`)

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