15.16.2 operator $<<$

virtual oeostream &operator << (oeistream&)

This operator fills the current stream by reading and storing all of the data from the specified input stream.

virtual oeostream &operator << (const char *)
virtual oeostream &operator << (const signed char *)
virtual oeostream &operator << (const unsigned char *)
virtual oeostream &operator << (const std::string &)
virtual oeostream &operator << (bool)
virtual oeostream &operator << (char)
virtual oeostream &operator << (signed char)
virtual oeostream &operator << (unsigned char)
virtual oeostream &operator << (short)
virtual oeostream &operator << (unsigned short)
virtual oeostream &operator << (int)
virtual oeostream &operator << (unsigned int)
virtual oeostream &operator << (long)
virtual oeostream &operator << (unsigned long)
virtual oeostream &operator << (float)
virtual oeostream &operator << (double)

These operators take the specified parameter, convert it to a text representation, and then push it onto the current stream as a whitespace- delimited text token.