[ospanstream.cons]

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explicit basic_ospanstream(std::span<charT> s,
                           ios_base::openmode which = ios_base::out);

Effects: Initializes the base class with basic_ostream<charT, traits>(addressof(sb) and sb with basic_spanbuf<charT, traits>(s, which | ios_base::out) ([spanbuf.cons]).

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basic_ospanstream(basic_ospanstream&& rhs) noexcept;

Effects: Initializes the base class with std::move(rhs) and sb with std::move(rhs.sb).

Next, basic_ostream<charT, traits>::set_rdbuf(addressof(sb) is called to install the contained basic_spanbuf.

31 Input/output library [input.output]

31.9 Span-based streams [span.streams]

31.9.5 Class template basic_ospanstream [ospanstream]

31.9.5.2 Constructors [ospanstream.cons]