[ospanstream] (original) (raw)

31 Input/output library [input.output]

31.9 Span-based streams [span.streams]

31.9.5 Class template basic_ospanstream [ospanstream]

31.9.5.1 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;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); basic_ospanstream& operator=(const basic_ospanstream&) = delete; basic_ospanstream& operator=(basic_ospanstream&& rhs);void swap(basic_ospanstream& rhs); 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; };}

31.9.5.2 Constructors [ospanstream.cons]

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

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

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.

31.9.5.3 Swap [ospanstream.swap]

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).

31.9.5.4 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).