namespace std { template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > class basic_istringstream : public basic_istream<charT,traits> { public: typedef charT char_type; typedef typename traits::int_type int_type; typedef typename traits::pos_type pos_type; typedef typename traits::off_type off_type; typedef traits traits_type; typedef Allocator allocator_type; // [istringstream.cons] Constructors: explicit basic_istringstream(ios_base::openmode which = ios_base::in); explicit basic_istringstream( const basic_string<charT,traits,Allocator>& str, ios_base::openmode which = ios_base::in); basic_istringstream(const basic_istringstream& rhs) = delete; basic_istringstream(basic_istringstream&& rhs); // [istringstream.assign] Assign and swap: basic_istringstream& operator=(const basic_istringstream& rhs) = delete; basic_istringstream& operator=(basic_istringstream&& rhs); void swap(basic_istringstream& rhs); // [istringstream.members] Members: 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; // exposition only }; template <class charT, class traits, class Allocator> void swap(basic_istringstream<charT, traits, Allocator>& x, basic_istringstream<charT, traits, Allocator>& y); }
The class basic_istringstream<charT, traits, Allocator> supports reading objects of class basic_string<charT, traits, Allocator>. It uses a basic_stringbuf<charT, traits, Allocator> object to control the associated storage. For the sake of exposition, the maintained data is presented here as:
sb, the stringbuf object.
explicit basic_istringstream(ios_base::openmode which = ios_base::in);
Effects: Constructs an object of class basic_istringstream<charT, traits>, initializing the base class with basic_istream(&sb) and initializing sb with basic_stringbuf<charT, traits, Allocator>(which | ios_base::in)) ([stringbuf.cons]).
explicit basic_istringstream(
const basic_string<charT, traits, Allocator>& str,
ios_base::openmode which = ios_base::in);
Effects: Constructs an object of class basic_istringstream<charT, traits>, initializing the base class with basic_istream(&sb) and initializing sb with basic_stringbuf<charT, traits, Allocator>(str, which | ios_base::in)) ([stringbuf.cons]).
basic_istringstream(basic_istringstream&& rhs);
Effects: Move constructs from the rvalue rhs. This is accomplished by move constructing the base class, and the contained basic_stringbuf. Next basic_istream<charT,traits>::set_rdbuf(&sb) is called to install the contained basic_stringbuf.
basic_istringstream& operator=(basic_istringstream&& rhs);
Effects: Move assigns the base and members of *this from the base and corresponding members of rhs.
Returns: *this.
void swap(basic_istringstream& rhs);
Effects: Exchanges the state of *this and rhs by calling basic_istream<charT,traits>::swap(rhs) and sb.swap(rhs.sb).
template <class charT, class traits, class Allocator>
void swap(basic_istringstream<charT, traits, Allocator>& x,
basic_istringstream<charT, traits, Allocator>& y);
Effects: x.swap(y).
basic_stringbuf<charT,traits,Allocator>* rdbuf() const;
Returns: const_cast<basic_stringbuf<charT,traits,Allocator>*>(&sb).
basic_string<charT,traits,Allocator> str() const;
Returns: rdbuf()->str().
void str(const basic_string<charT,traits,Allocator>& s);
Effects: Calls rdbuf()->str(s).