How to make a function triggered when you activate/deactivate a GameObject

Hi everyone.

I am making a game and want to use only one scene, as the continuous creation and destruction of objects is quite expensive and may even cause memory errors (correct me if I am wrong, but that's what they told me in college)

So, to emulate the desired behaviour, I made this:
Scene -> Empty GameObject
GameObjects in a Scene -> Children of the scene GO
Scene Change -> Activate and deactivate Scene GO (and by extension all their children)

The thing is, I want to know if it is possible to make a function that is triggered every time you activate a GameObject (what in a normal architecture would be done by the Start function)

Thanks in advanced and sorry for bad English

 

It is possible, check out OnEnable and OnDisable.

Check out this link for reference on the order of MonoBehaviour callbacks: http://docs.unity3d.com/Manual/ExecutionOrder.html

 

Thanks man. That's exactly what wanted