String streams are similar to the <iostream> and <fstream> libraries, except that string streams allow you to perform I/O on strings instead of streams. The <sstream> library provides functionality similar to sscanf and sprintf in the standard C library.
Three main classes are available in <sstream>:
String streams are actually subclasses of iostreams, so all of the functions available for iostreams are also available for stringstream. See the C++ I/O functions for more information.
In addition, string streams also supply the following functions:
| Constructors | create new string streams |
| Operators | read from and write to string streams |
| rdbuf | get the buffer for a string stream |
| str | get or set the stream's string |