public static int RemoveRandomBit(ref int bitmask)
{
var randomBitIndex = UnityEngine.Random.Range(0, PopCount(bitmask));
var actualBitIndex = BitOpsHelper.BFind(bitmask, randomBitIndex + 1);
bitmask &= ~(1 << actualBitIndex);
return(actualBitIndex);
}
public void test_bfind()
{
// 11 = 1011, so the third flipped bit is in index 3
Assert.AreEqual(3, BitOpsHelper.BFind(11, 3));
// 3 = 11, so there's no third flipped bit and BFind returns 32
Assert.AreEqual(32, BitOpsHelper.BFind(3, 3));
// searching for the 0th flipped bit always causes BFind to return 32
Assert.AreEqual(32, BitOpsHelper.BFind(1, 0));
}