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An object handle service must meet the requirements for a handle service, as well as the additional requirements listed below.
        In the table below, X denotes
        an object handle service class, a
        denotes a value of type X,
        b denotes a value of type
        X::implementation_type, ec
        denotes a value of type error_code,
        and wh denotes a value meeting
        WaitHandler
        requirements.
      
Table 19. ObjectHandleService requirements
| expression | return type | 
                  assertion/note | 
|---|---|---|
| 
                   | 
                   | 
                  pre:  | 
| 
                   | 
                   | 
                  pre:  |