Exchanges the elements of two stream objects.
template<class Elem, class Tr>
    void swap(
        basic_istream<Elem, Tr>& _Left,
        basic_istream<Elem, Tr>& _Right
    );
template<class Elem, class Tr>
    void swap(
        basic_iostream<Elem, Tr>& _Left,
        basic_iostream<Elem, Tr>& _Right
);
Parameters
- _Left 
 A stream.
- _Right 
 A stream.
Requirements
Header: <istream>
Namespace: std