std::stringstream

std::stringstream is a class in the C++ Standard Library that provides a stream interface for reading and writing strings. It is defined in the <sstream> header file and is part of the iostream library.

The std::stringstream class allows a string to be treated as a stream, enabling input and output operations to be performed on it. It provides methods for reading and writing data, formatting data, and manipulating the stream.

Some common methods of the std::stringstream class include:

- str(): returns the string associated with the stream.
- str(const std::string&): sets the string associated with the stream.
- operator<<(): writes data to the stream.
- operator>>(): reads data from the stream.
- clear(): clears any error flags and resets the stream to an empty state.

std::stringstream is useful when you need to manipulate strings as if they were streams, such as when parsing input data or formatting output.