This ostream base64-encodes all data written to it and forwards it to a connected ostream. Always call close() when done writing data, to ensure proper completion of the encoding operation.
Note: The characters are directly written to the ostream's streambuf, thus bypassing the ostream. The ostream's state is therefore not updated to match the buffer's state.
Direct Base Classes: Base64EncoderIOS, std::ostream
All Base Classes: Base64EncoderIOS, std::ios, std::ostream
std::ostream & ostr,
int options = 0