explicit basic_ostringstream(ios_base::openmode which);
explicit basic_ostringstream(
const basic_string<charT, traits, Allocator>& s,
ios_base::openmode which = ios_base::out);
basic_ostringstream(ios_base::openmode which, const Allocator& a);
explicit basic_ostringstream(
basic_string<charT, traits, Allocator>&& s,
ios_base::openmode which = ios_base::out);
template<class SAlloc>
basic_ostringstream(
const basic_string<charT, traits, SAlloc>& s,
ios_base::openmode which, const Allocator& a);
template<class SAlloc>
explicit basic_ostringstream(
const basic_string<charT, traits, SAlloc>& s,
ios_base::openmode which = ios_base::out);
basic_ostringstream(basic_ostringstream&& rhs);
void swap(basic_ostringstream& rhs);
template<class charT, class traits, class Allocator>
void swap(basic_ostringstream<charT, traits, Allocator>& x,
basic_ostringstream<charT, traits, Allocator>& y);
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);