namespace std {template<class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT>>class basic_stringbuf;
using stringbuf = basic_stringbuf<char>;
using wstringbuf = basic_stringbuf<wchar_t>;
template<class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT>>class basic_istringstream;
using istringstream = basic_istringstream<char>;
using wistringstream = basic_istringstream<wchar_t>;
template<class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT>>class basic_ostringstream;
using ostringstream = basic_ostringstream<char>;
using wostringstream = basic_ostringstream<wchar_t>;
template<class charT, class traits = char_traits<charT>,
class Allocator = allocator<charT>>class basic_stringstream;
using stringstream = basic_stringstream<char>;
using wstringstream = basic_stringstream<wchar_t>;
}
The header <sstream> defines four class templates
and eight types that associate stream buffers with objects of class
basic_string,
as described in [string.classes].