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        In the table below, a denotes
        an asynchronous read stream object, mb
        denotes an object satisfying mutable
        buffer sequence requirements, and h
        denotes an object satisfying read
        handler requirements.
      
Table 3. Buffer-oriented asynchronous read stream requirements
| operation | type | semantics, pre/post-conditions | 
|---|---|---|
| 
                   | 
                   | 
                  Returns the  | 
| 
                   | 
                   | 
                  Initiates an asynchronous operation to read one or more bytes of
                  data from the stream  |