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Query the occupancy (recommended number of work items) for the system context.
std::size_t query(
    execution::occupancy_t ) const;
            Do not call this function directly. It is intended for use with the
            query
            customisation point.
          
For example:
boost::asio::system_executor ex;
std::size_t occupancy = boost::asio::query(
    ex, boost::asio::execution::occupancy);