This class provides common methods and is also needed to ensure the correct initialization order of the stream buffer and base classes.
Direct Base Classes: std::ios
All Base Classes: std::ios
std::istream & istr
Creates the MailIOS and connects it to the given input stream.
std::ostream & ostr
Creates the MailIOS and connects it to the given output stream.
Destroys the stream.
Writes the terminating period, followed by CR-LF.
MailStreamBuf * rdbuf();
Returns a pointer to the underlying streambuf.