# Can't get child class instance from "OnHit" function

**URL:** <https://forums.unrealengine.com/t/cant-get-child-class-instance-from-onhit-function/448228>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine\
**Created:** [May 2, 2019, 8:16am UTC](https://forums.unrealengine.com/t/cant-get-child-class-instance-from-onhit-function/448228 "2019-05-02T08:16:38Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Lardo\_Deepdelver](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Lardo\_Deepdelver](https://forums.unrealengine.com/u/Lardo_Deepdelver)\
**Post date:** [May 2, 2019, 10:03am UTC](https://forums.unrealengine.com/t/cant-get-child-class-instance-from-onhit-function/448228/4 "2019-05-02T10:03:18Z")

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casting can not work with runtime classes, it needs to know what to cast to at compile time

sounds like what you want to do is use an interface

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basically all your classes that should DoSomething need to implement that interface and in the hit you check if the object implements it, and if so call it

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