31 Input/output library [input.output]

31.9 Span-based streams [span.streams]

31.9.4 Class template basic_ispanstream [ispanstream]

31.9.4.2 Constructors [ispanstream.cons]

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

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

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basic_ispanstream(basic_ispanstream&& rhs);

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

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

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template<class ROS> explicit basic_ispanstream(ROS&& s)

Constraints: ROS models ranges::borrowed_range.

!convertible_to<ROS, std::span<charT>> && convertible_to<ROS, std::span<charT const>> is true.

Effects: Let sp be std::span<const charT>(std::forward<ROS>(s)).

Equivalent to: basic_ispanstream(std::span<charT>(const_cast<charT*>(sp.data()), sp.size()))