|  | 
        In the table below, a denotes
        an asynchronous write stream object, cb
        denotes an object satisfying constant
        buffer sequence requirements, and h
        denotes an object satisfying write
        handler requirements.
      
Table 4. Buffer-oriented asynchronous write stream requirements
| operation | type | semantics, pre/post-conditions | 
|---|---|---|
| 
                   | 
                   | 
                  Returns the  | 
| 
                   | 
                   | 
                  Initiates an asynchronous operation to write one or more bytes
                  of data to the stream  |