basic_stringbuf<charT, traits, Allocator>* rdbuf() const;
basic_string<charT, traits, Allocator> str() const &;
template<class SAlloc>
basic_string<charT,traits,SAlloc> str(const SAlloc& sa) const;
basic_string<charT,traits,Allocator> str() &&;
basic_string_view<charT, traits> view() const noexcept;
void str(const basic_string<charT, traits, Allocator>& s);
template<class SAlloc>
void str(const basic_string<charT, traits, SAlloc>& s);
void str(basic_string<charT, traits, Allocator>&& s);