# Standard library header <sstream>

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< cpp‎ | header

This header is part of the Input/Output library.

### Classes

basic_stringbuf | implements raw string device (class template)
basic_istringstream | implements high-level string stream input operations (class template)
basic_ostringstream | implements high-level string stream output operations (class template)
basic_stringstream | implements high-level string stream input/output operations (class template)

### Typedefs

`stringbuf` | basic_stringbuf<char>
`wstringbuf` | basic_stringbuf<wchar_t>
`istringstream` | basic_istringstream<char>
`wistringstream` | basic_istringstream<wchar_t>
`ostringstream` | basic_ostringstream<char>
`wostringstream` | basic_ostringstream<wchar_t>
`stringstream` | basic_stringstream<char>
`wstringstream` | basic_stringstream<wchar_t>

### Functions

std::swap(std::basic_stringbuf) (C++11) | specializes the std::swap algorithm (function template)
std::swap(std::basic_istringstream) (C++11) | specializes the std::swap algorithm (function template)
std::swap(std::basic_istringstream) (C++11) | specializes the std::swap algorithm (function template)
std::swap(std::basic_istringstream) (C++11) | specializes the std::swap algorithm (function template)

### Synopsis

    namespace std {

        template <class charT,
                  class traits = char_traits<charT>,
                  class Allocator = allocator<charT> >
            class basic_stringbuf;
        typedef basic_stringbuf<char> stringbuf;
        typedef basic_stringbuf<wchar_t> wstringbuf;
        template <class charT, class traits, class Allocator>
            void swap(basic_stringbuf<charT, traits, Allocator>& x,
                      basic_stringbuf<charT, traits, Allocator>& y);

        template <class charT,
                  class traits = char_traits<charT>,
                  class Allocator = allocator<charT> >
            class basic_istringstream;
        typedef basic_istringstream<char> istringstream;
        typedef basic_istringstream<wchar_t> wistringstream;
        template <class charT, class traits, class Allocator>
            void swap(basic_istringstream<charT, traits, Allocator>& x,
                      basic_istringstream<charT, traits, Allocator>& y);

        template <class charT,
                  class traits = char_traits<charT>,
                  class Allocator = allocator<charT> >
            class basic_ostringstream;
        typedef basic_ostringstream<char> ostringstream;
        typedef basic_ostringstream<wchar_t> wostringstream;
        template <class charT, class traits, class Allocator>
            void swap(basic_ostringstream<charT, traits, Allocator>& x,
                      basic_ostringstream<charT, traits, Allocator>& y);

        template <class charT,
                  class traits = char_traits<charT>,
                  class Allocator = allocator<charT> >
            class basic_stringstream;
        typedef basic_stringstream<char> stringstream;
        typedef basic_stringstream<wchar_t> wstringstream;
        template <class charT, class traits, class Allocator>
            void swap(basic_stringstream<charT, traits, Allocator>& x,
                      basic_stringstream<charT, traits, Allocator>& y);
    }

#### Class std::basic_stringbuf

    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
    class basic_stringbuf : public basic_streambuf<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;

        // Constructors:
        explicit basic_stringbuf(ios_base::openmode which = ios_base::in|ios_base::out);
        explicit basic_stringbuf(const basic_string<charT,traits,Allocator>& str,
                                 ios_base::openmode which = ios_base::in|ios_base::out);
        basic_stringbuf(const basic_stringbuf& rhs) = delete;
        basic_stringbuf(basic_stringbuf&& rhs);

        // Assign and swap:
        basic_stringbuf& operator=(const basic_stringbuf& rhs) = delete;
        basic_stringbuf& operator=(basic_stringbuf&& rhs);
        void swap(basic_stringbuf& rhs);

        // Get and set:
        basic_string<charT,traits,Allocator> str() const;
        void str(const basic_string<charT,traits,Allocator>& s);

     protected:
        // Overridden virtual functions:
        virtual int_type underflow();
        virtual int_type pbackfail(int_type c = traits::eof());
        virtual int_type overflow (int_type c = traits::eof());
        virtual basic_streambuf<charT,traits>* setbuf(charT*, streamsize);
        virtual pos_type seekoff(off_type off, ios_base::seekdir way,
                                 ios_base::openmode which = ios_base::in|ios_base::out);
        virtual pos_type seekpos(pos_type sp,
                                 ios_base::openmode which = ios_base::in|ios_base::out);

     private:
        ios_base::openmode mode; // exposition only
    };

#### Class std::basic_istringstream

    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;

        // 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);

        // Assign and swap:
        basic_istringstream& operator=(const basic_istringstream& rhs) = delete;
        basic_istringstream& operator=(basic_istringstream&& rhs);
        void swap(basic_istringstream& rhs);

        // 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
    };

#### Class std::basic_ostringstream

    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
    class basic_ostringstream : public basic_ostream<charT,traits> {
     public:
        // types:
        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;

        // Constructors/destructor:
        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);

        // Assign/swap:
        basic_ostringstream& operator=(const basic_ostringstream& rhs) = delete;
        basic_ostringstream& operator=(basic_ostringstream&& rhs);
        void swap(basic_ostringstream& rhs);

        // 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
    };

#### Class std::basic_stringstream

    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
    class basic_stringstream : public basic_iostream<charT,traits> {
     public:
        // types:
        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;

        // constructors/destructor
        explicit basic_stringstream(ios_base::openmode which = ios_base::out|ios_base::in);
        explicit basic_stringstream(const basic_string<charT,traits,Allocator>& str,
                                    ios_base::openmode which = ios_base::out|ios_base::in);
        basic_stringstream(const basic_stringstream& rhs) = delete;
        basic_stringstream(basic_stringstream&& rhs);

        // Assign/swap:
        basic_stringstream& operator=(const basic_stringstream& rhs) = delete;
        basic_stringstream& operator=(basic_stringstream&& rhs);
        void swap(basic_stringstream& rhs);

        // Members:
        basic_stringbuf<charT,traits,Allocator>* rdbuf() const;
        basic_string<charT,traits,Allocator> str() const;
        void str(const basic_string<charT,traits,Allocator>& str);

     private:
        basic_stringbuf<charT, traits> sb; // exposition only
    };

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