namespace std {
template <class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT>>
class basic_ostringstream : 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;
using allocator_type = Allocator;
explicit basic_ostringstream(
ios_base::openmode which = ios_base::out);
explicit basic_ostringstream(
const basic_string<charT, traits, Allocator>& str,
ios_base::openmode which = ios_base::out);
basic_ostringstream(const basic_ostringstream& rhs) = delete;
basic_ostringstream(basic_ostringstream&& rhs);
basic_ostringstream& operator=(const basic_ostringstream& rhs) = delete;
basic_ostringstream& operator=(basic_ostringstream&& rhs);
void swap(basic_ostringstream& rhs);
basic_stringbuf<charT, traits, Allocator>* rdbuf() const;
basic_string<charT, traits, Allocator> str() const;
void str(const basic_string<charT, traits, Allocator>& s);
private:
basic_stringbuf<charT, traits, Allocator> sb; };
template <class charT, class traits, class Allocator>
void swap(basic_ostringstream<charT, traits, Allocator>& x,
basic_ostringstream<charT, traits, Allocator>& y);
}
The class basic_ostringstream<charT, traits, Allocator> supports writing objects of class basic_string<charT, traits, Allocator>. It uses a basic_stringbuf object to control the associated storage. For the sake of exposition, the maintained data is presented here as:
sb, the stringbuf object.
explicit basic_ostringstream( ios_base::openmode which = ios_base::out);
Effects: Constructs an object of class basic_ostringstream, initializing the base class with basic_ostream(&sb) and initializing sb with basic_stringbuf<charT, traits, Allocator>(which | ios_base::out)) ([stringbuf.cons]).
explicit basic_ostringstream( const basic_string<charT, traits, Allocator>& str, ios_base::openmode which = ios_base::out);
Effects: Constructs an object of class basic_ostringstream<charT, traits>, initializing the base class with basic_ostream(&sb) and initializing sb with basic_stringbuf<charT, traits, Allocator>(str, which | ios_base::out)) ([stringbuf.cons]).
basic_ostringstream(basic_ostringstream&& rhs);
Effects: Move constructs from the rvalue rhs. This is accomplished by move constructing the base class, and the contained basic_stringbuf. Next basic_ostream<charT, traits>::set_rdbuf(&sb) is called to install the contained basic_stringbuf.
30.8.4.2 Assign and swap [ostringstream.assign]basic_ostringstream& operator=(basic_ostringstream&& rhs);
Effects: Move assigns the base and members of *this from the base and corresponding members of rhs.
void swap(basic_ostringstream& rhs);
Effects: Exchanges the state of *this and rhs by calling basic_ostream<charT, traits>::swap(rhs) and sb.swap(rhs.sb).
template <class charT, class traits, class Allocator> void swap(basic_ostringstream<charT, traits, Allocator>& x, basic_ostringstream<charT, traits, Allocator>& y);
Effects: As if by x.swap(y).
30.8.4.3 Member functions [ostringstream.members]basic_stringbuf<charT, traits, Allocator>* rdbuf() const;
Returns: const_cast<basic_stringbuf<charT, traits, Allocator>*>(&sb).
basic_string<charT, traits, Allocator> str() const;
void str(const basic_string<charT, traits, Allocator>& s);
Effects: Calls rdbuf()->str(s).
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