29 Input/output library [input.output]

29.9 Span-based streams [span.streams]

29.9.5 Class template basic_­ospanstream [ospanstream]

29.9.5.1 General [ospanstream.general]

namespace std { template<class charT, class traits = char_traits<charT>> class basic_ospanstream : public basic_ostream<charT, traits> { public: using char_type = charT; using int_type = typename traits::int_type; using pos_type = typename traits::pos_type; using off_type = typename traits::off_type; using traits_type = traits; // [ospanstream.ctor], constructors explicit basic_ospanstream(std::span<charT> s, ios_base::openmode which = ios_base::out); basic_ospanstream(const basic_ospanstream&) = delete; basic_ospanstream(basic_ospanstream&& rhs); // [ospanstream.assign], assignment and swap basic_ospanstream& operator=(const basic_ospanstream&) = delete; basic_ospanstream& operator=(basic_ospanstream&& rhs); void swap(basic_ospanstream& rhs); // [ospanstream.members], member functions basic_spanbuf<charT, traits>* rdbuf() const noexcept; std::span<charT> span() const noexcept; void span(std::span<charT> s) noexcept; private: basic_spanbuf<charT, traits> sb; // exposition only }; template<class charT, class traits> void swap(basic_ospanstream<charT, traits>& x, basic_ospanstream<charT, traits>& y); }

29.9.5.2 Constructors [ospanstream.ctor]

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.ctor]).
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.

29.9.5.3 Assignment and swap [ospanstream.assign]

void swap(basic_ospanstream& rhs);
Effects: Equivalent to: basic_ostream<charT, traits>::swap(rhs); sb.swap(rhs.sb);
template<class charT, class traits> void swap(basic_ospanstream<charT, traits>& x, basic_ospanstream<charT, traits>& y);
Effects: Equivalent to x.swap(y).

29.9.5.4 Member functions [ospanstream.members]

basic_spanbuf<charT, traits>* rdbuf() const noexcept;
Effects: Equivalent to: return const_cast<basic_spanbuf<charT, traits>*>(addressof(sb));
std::span<charT> span() const noexcept;
Effects: Equivalent to: return rdbuf()->span();
void span(std::span<charT> s) noexcept;
Effects: Equivalent to rdbuf()->span(s).