31 Input/output library [input.output]

31.9 Span-based streams [span.streams]

31.9.3 Class template basic_spanbuf [spanbuf]

31.9.3.4 Member functions [spanbuf.members]

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std::span<charT> span() const noexcept;
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Returns: If ios_base​::​out is set in mode, returns std​::​span<charT>(pbase(), pptr()), otherwise returns buf.
[Note 1: 
In contrast to basic_stringbuf, the underlying sequence never grows and is not owned.
An owning copy can be obtained by converting the result to basic_string<charT>.
— end note]
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void span(std::span<charT> s) noexcept;
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Effects: buf = s.
Initializes the input and output sequences according to mode.
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Postconditions:
  • (3.1)
    If ios_base​::​out is set in mode, pbase() == s.data() && epptr() == pbase() + s.size() is true;
    • (3.1.1)
      in addition, if ios_base​::​ate is set in mode, pptr() == pbase() + s.size() is true,
    • (3.1.2)
      otherwise pptr() == pbase() is true.
  • (3.2)
    If ios_base​::​in is set in mode, eback() == s.data() && gptr() == eback() && egptr() == eback() + s.size() is true.