How to add a raw pointer to dynamic multicast delegate

I want to add a raw pointer to the ParticleSystemComponent->OnSystemFinished which is a dynamic multicast delegate,but no matter BindRaw or AddRaw can’t compile through.

I read this A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums the sample “RamaMeleeWeaponComp->RamaMeleeWeapon_OnHit.BindRaw(this, &FSomeRawCPPClass::RespondToMeleeDamageTaken);” can’t compile through. I used just like that.

Please help me with how to add a raw pointer to dynamic multicast delegate.