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If T has a nested type executor_type,
          returns t.get_executor().
          Otherwise returns type().
        
static decltype(auto) get( const T & t); » more...
          If T has a nested type
          executor_type, returns
          t.get_executor().
          Otherwise returns ex.
        
static decltype(auto) get( const T & t, const Executor & ex); » more...