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Returns a mutable buffer sequence representing writable bytes.
mutable_buffers_type prepare( size_type n);
          Returns a mutable buffer sequence representing the writable bytes containing
          exactly n bytes of storage.
          Memory may be reallocated as needed. All buffer sequences previously obtained
          using prepare are invalidated. Buffer
          sequences previously obtained using data remain valid.
        
| Name | Description | 
|---|---|
| 
                     | The desired number of bytes in the returned buffer sequence. | 
| Type | Thrown On | 
|---|---|
| 
                     | 
                    if  | 
Strong guarantee.