template< class CharT, class Traits,
class Engine, size_t p, size_t r >
std::basic_ostream<CharT,Traits>&
operator<<( std::basic_ostream<CharT,Traits>& ost,
const std::discard_block_engine<Engine,p,r>& e ); (1) (since C++11) template< class CharT, class Traits,
class Engine, size_t p, size_t r >
std::basic_istream<CharT,Traits>&
operator>>( std::basic_istream<CharT,Traits>