/// Returns the name of the NULL device (/dev/null, null).
std::string const & nulldev();
-/// Returns the name of the stdout device (/dev/stdout, /dev/tty, conout$).
-std::string const & stdoutdev();
-
-/// Returns the name of the stderr device (/dev/stderr, /dev/tty, conout$).
-std::string const & stderrdev();
-
/// Tells whether \p channel is connected to a terminal or not.
bool is_terminal(io_channel channel);