Method RedirectedStream

unittests/catch.hpp:8516–8522

    public:
        RedirectedStream( std::ostream& originalStream, std::ostream& redirectionStream )
        :   m_originalStream( originalStream ),
            m_redirectionStream( redirectionStream ),
            m_prevBuf( m_originalStream.rdbuf() )
        {
            m_originalStream.rdbuf( m_redirectionStream.rdbuf() );
        }
        ~RedirectedStream() {
            m_originalStream.rdbuf( m_prevBuf );
        }