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An I/O object service must meet the requirements for a service, as well as the requirements listed below.
        In the table below, X denotes an I/O object service class,
        a and ao denote values of type X,
        b and c denote values of type X::implementation_type,
        and u denotes an identifier.
      
Table 23. IoObjectService requirements
| expression | return type | 
                  assertion/note | 
|---|---|---|
| 
                   | ||
| 
                   | 
                  note:  | |
| 
 a.construct(b); 
 | ||
| 
 a.destroy(b); 
 | 
                  note:  | |
| 
 a.move_construct(b, c); 
 | note: only required for I/O objects that support movability. | |
| 
 a.move_assign(b, ao, c); 
 | note: only required for I/O objects that support movability. |