[istringstream.general]

# 31 Input/output library [[input.output]](./#input.output)

## 31.8 String-based streams [[string.streams]](string.streams#istringstream.general)

### 31.8.3 Class template basic_istringstream [[istringstream]](istringstream#general)

#### 31.8.3.1 General [istringstream.general]

[ð](#lib:basic_istringstream)

namespace std {template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_istringstream : public basic_istream<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; // [[istringstream.cons]](istringstream.cons "31.8.3.2 Constructors"), constructors basic_istringstream() : basic_istringstream(ios_base::in) {}explicit basic_istringstream(ios_base::openmode which); explicit basic_istringstream(const basic_string<charT, traits, Allocator>& s,
 ios_base::openmode which = ios_base::in);
 basic_istringstream(ios_base::openmode which, const Allocator& a); explicit basic_istringstream( basic_string<charT, traits, Allocator>&& s,
 ios_base::openmode which = ios_base::in); template<class SAlloc> basic_istringstream(const basic_string<charT, traits, SAlloc>& s, const Allocator& a): basic_istringstream(s, ios_base::in, a) {}template<class SAlloc> basic_istringstream(const basic_string<charT, traits, SAlloc>& s,
 ios_base::openmode which, const Allocator& a); template<class SAlloc>explicit basic_istringstream(const basic_string<charT, traits, SAlloc>& s,
 ios_base::openmode which = ios_base::in); template<class T>explicit basic_istringstream(const T& t, ios_base::openmode which = ios_base::in); template<class T> basic_istringstream(const T& t, const Allocator& a); template<class T> basic_istringstream(const T& t, ios_base::openmode which, const Allocator& a);
 basic_istringstream(const basic_istringstream&) = delete;
 basic_istringstream(basic_istringstream&& rhs);

 basic_istringstream& operator=(const basic_istringstream&) = delete;
 basic_istringstream& operator=(basic_istringstream&& rhs); // [[istringstream.swap]](istringstream.swap "31.8.3.3 Swap"), swapvoid swap(basic_istringstream& rhs); // [[istringstream.members]](istringstream.members "31.8.3.4 Member functions"), members 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); template<class T>void str(const T& t); private: basic_stringbuf<charT, traits, Allocator> *sb*; // *exposition only*};}

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L8953)

The classbasic_istringstream<charT, traits, Allocator> supports reading objects of classbasic_string<​charT, traits, Allocator>[.](#1.sentence-1)

It uses abasic_stringbuf<charT, traits, Allocator> object to control the associated storage[.](#1.sentence-2)

For the sake of exposition, the maintained data is presented here as:

- [(1.1)](#1.1)

*sb*, the stringbuf object[.](#1.sentence-3)
