# Setting up an use-key for many classes (c++)

**URL:** <https://forums.unrealengine.com/t/setting-up-an-use-key-for-many-classes-c/313152>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine\
**Created:** [March 30, 2015, 12:20pm UTC](https://forums.unrealengine.com/t/setting-up-an-use-key-for-many-classes-c/313152 "2015-03-30T12:20:55Z")\
**Posts on this page:** 1\
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**Author:** ![anonymous\_user\_3759fba9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_3759fba9](https://forums.unrealengine.com/u/anonymous_user_3759fba9)\
**Post date:** [March 30, 2015, 12:55pm UTC](https://forums.unrealengine.com/t/setting-up-an-use-key-for-many-classes-c/313152/2 "2015-03-30T12:55:41Z")

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Hi !

I think you should consider using Interfaces :

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This will give you the ability to use the same functions (here, useKey()) on every class that implements the Interface, and to handle the use of the E key separately.

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_[View the full topic](https://forums.unrealengine.com/t/setting-up-an-use-key-for-many-classes-c/313152)._