C# Left Shift Operator

Question

There\'s a statement a co-worker of mine wrote which I don\'t completely understand. Unfortunately he\'s not available right now, so here it is (with modified names, we\'re

Answer 1

Your coworker is essentially using an int in place of a bool[32] to try to save on space. The block of code you show is analogous to

bool[] FRUIT_LAYERS = new bool[32];
FRUIT_LAYERS[LayerMask.NameToLayer("Apple")] = true;
FRUIT_LAYERS[LayerMask.NameToLayer("Banana")] = true;

You might want to consider a pattern more like this:

[Flags]
enum FruitLayers : int
{
    Apple = 1 << 0,
    Banana = 1 << 1,
    Kiwi = 1 << 2,
    ...
}

private readonly FruitLayers FRUIT_LAYERS = FruitLayers.Apple | FruitLayers.Banana;