| ostream | Constructs an ostream object that is attached to an existing streambuf object. | |
| ~ostream | Destroys an ostream object. |
| opfx | Output prefix function, called prior to insertion operations to check for error conditions, and so forth. | |
| osfx | Output suffix function, called after insertion operations; flushes the stream's buffer if it is unit buffered. |
| put | Inserts a single byte into the stream. | |
| write | Inserts a series of bytes into the stream. |
| flush | Flushes the buffer associated with this stream. | |
| seekp | Changes the stream's put pointer. | |
| tellp | Gets the value of the stream's put pointer. |
| operator << | An insertion operator for various types. |