31 Input/output library [input.output]

31.8 String-based streams [string.streams]

31.8.5 Class template basic_stringstream [stringstream]

31.8.5.2 Constructors [stringstream.cons]

explicit basic_stringstream(ios_base::openmode which);

Effects: Initializes the base class with basic_iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_stringbuf<charT, traits, Allocator>(which).

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explicit basic_stringstream(
  const basic_string<charT, traits, Allocator>& s,
  ios_base::openmode which = ios_base::out | ios_base::in);

Effects: Initializes the base class with basic_iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_stringbuf<charT, traits, Allocator>(s, which).

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basic_stringstream(ios_base::openmode which, const Allocator& a);

Effects: Initializes the base class with basic_iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_stringbuf<charT, traits, Allocator>(which, a) ([stringbuf.cons]).

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explicit basic_stringstream(
  basic_string<charT, traits, Allocator>&& s,
  ios_base::openmode which = ios_base::out | ios_base::in);

Effects: Initializes the base class with basic_iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_stringbuf<charT, traits, Allocator>(std::move(s), which) ([stringbuf.cons]).

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template<class SAlloc>
  basic_stringstream(
    const basic_string<charT, traits, SAlloc>& s,
    ios_base::openmode which, const Allocator& a);

Effects: Initializes the base class with basic_iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_stringbuf<charT, traits, Allocator>(s, which, a) ([stringbuf.cons]).

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template<class SAlloc>
  explicit basic_stringstream(
    const basic_string<charT, traits, SAlloc>& s,
    ios_base::openmode which = ios_base::out | ios_base::in);

Constraints: is_same_v<SAlloc,Allocator> is false.

Effects: Initializes the base class with basic_iostream<charT, traits>(addressof(sb)) ([iostream.cons]) and sb with basic_stringbuf<charT, traits, Allocator>(s, which) ([stringbuf.cons]).

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basic_stringstream(basic_stringstream&& rhs);

Effects: Move constructs from the rvalue rhs.

This is accomplished by move constructing the base class, and the contained basic_stringbuf.

Then calls basic_istream<charT, traits>::set_rdbuf(addressof(sb)) to install the contained basic_stringbuf.