Input - allocates temporary variable

Questions & Answers
1

What does it mean when the documentation refers to whether something “does not allocate temporary variables” vs “allocates temporary variables”

http://unity3d.com/support/documentation/ScriptReference/Input.html

2

Well, they refer to the fact that the [touches][1] and [accelerationEvents][2] properties of Input create an array out of the individual Touches. Here’s how .touches is implemented internally:

// C#
public static Touch[] touches
{
    get
    {
        int touchCount = Input.touchCount;
        Touch[] array = new Touch[touchCount];
        for (int i = 0; i < touchCount; i++)
        {
            array *= Input.GetTouch(i);*

}
return array;
}
}
It’s just a hint that it might be a performance overhead if you use this property multiple times each frame. If you just need the information of one specific touch you should use the GetTouch() method instead.
[1]: http://unity3d.com/support/documentation/ScriptReference/Input-touches.html
[2]: http://unity3d.com/support/documentation/ScriptReference/Input-accelerationEvents.html