31 Input/output library [input.output]

31.8 String-based streams [string.streams]

31.8.2 Class template basic_stringbuf [stringbuf]

31.8.2.3 Assignment and swap [stringbuf.assign]

basic_stringbuf& operator=(basic_stringbuf&& rhs);

Effects: After the move assignment *this has the observable state it would have had if it had been move constructed from rhs (see [stringbuf.cons]).

Returns: *this.

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void swap(basic_stringbuf& rhs) noexcept(see below);

Preconditions: allocator_traits<Allocator>::propagate_on_container_swap::value is true or get_allocator() == rhs.get_allocator() is true.

Effects: Exchanges the state of *this and rhs.

Remarks: The exception specification is equivalent to:

allocator_traits<Allocator>::propagate_on_container_swap::value ||

allocator_traits<Allocator>::is_always_equal::value

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template<class charT, class traits, class Allocator>
  void swap(basic_stringbuf<charT, traits, Allocator>& x,
            basic_stringbuf<charT, traits, Allocator>& y) noexcept(noexcept(x.swap(y)));

Effects: Equivalent to x.swap(y).