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