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            Query the current value of the mapping property.
          
static constexpr execution::mapping_t query(
    execution::mapping_t );
            Do not call this function directly. It is intended for use with the
            query
            customisation point.
          
For example:
boost::asio::system_executor ex;
if (boost::asio::query(ex, boost::asio::execution::mapping)
      == boost::asio::execution::mapping.thread)
  ...