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Construct
          an any_completion_handler
          in an empty state, without a target object.
        
constexpr any_completion_handler(); » more... constexpr any_completion_handler( nullptr_t ); » more...
          Construct an any_completion_handler
          to contain the specified target.
        
template< typename H, typename Handler = decay_t<H>> any_completion_handler( H && h, constraint_t< !is_same< decay_t< H >, any_completion_handler >::value > = 0); » more...
          Move-construct an any_completion_handler
          from another.
        
any_completion_handler( any_completion_handler && other); » more...