Hey Luoyu,
Glad to know it worked. The type conversion of the Point_2 type and its
usability mainly depends on how your program works. Make sure to avoid any
type of downcasting. There are various solution available for that. I could
have given a further detailed solution, if i had a look at your program.
Moreover i think you can figure it out yourself. If still you need any
assistance, i would be glad to help.
Regards,
Anmolpreet Singh
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