The Expert Advisor demonstrates the use of functions from the Current Next Futures script, which enables automatic switch to a new futures before expiration. The EA opens a position of the appropriate volume on three instruments, which are specified in input parameters. Negative volume values are used for sell positions, positive ones are for buy positions. A few hours before the expiration of the futures (specified in hours_before_expiration), the EA closes the position and opens a new one on the new futures symbol.
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/20453