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Append writable bytes to the readable bytes.
void commit( std::size_t n);
          Appends n bytes from the start of the writable bytes to the end of the
          readable bytes. The remainder of the writable bytes are discarded. If n
          is greater than the number of writable bytes, all writable bytes are appended
          to the readable bytes. All buffers sequences previously obtained using
          static_buffer::data or static_buffer::prepare are invalidated.
        
| Name | Description | 
|---|---|
| 
                     | The number of bytes to append. If this number is greater than the number of writable bytes, all writable bytes are appended. | 
No-throw guarantee.