Time for action – Mal-function

First, we'll take a look at what can go wrong in function declarations.

1. Let's add a new function to our class:

   simulated function HitWall()
   {
   }

2. Compile the code and we'll get this error:

   [0003.93] Log: R:\UDK\UDK-AwesomeGame\Development\Src\BrokenGame\Classes\BrokenActor.uc(4) : Error, Redefinition of 'function HitWall' differs from original; different number of parameters

3. If we look at Actor.uc we can see the original declaration of this function:

   event HitWall( vector HitNormal, actor Wall, PrimitiveComponent WallComp )

4. When overriding a function, you must use the same parameters as the original. You can change the names if you want, for instance this would work:

   simulated function HitWall( vector Norm, actor HitActor, PrimitiveComponent Prim )
   {
   }

   The number and type of parameters must stay the same though.

   This type of error usually results from misreading the parameters when overriding a function, or accidentally making up a function that already exists in a superclass...