void Grow()
{
var oldData = _data;
var oldSize = oldData.Slots.Length;
var newSize = oldSize * 2;
var newSlots = new Slot[newSize];
Array.Copy(oldData.Slots, newSlots, oldSize);
var newBuckets = new int[newSize];
for (var i = 0; i < oldSize; i++)
{
var bucket = newSlots[i].HashCode.Value % newSize;
newSlots[i].Next = newBuckets[bucket] - 1;
newBuckets[bucket] = i + 1;
}
_data = new BucketsAndSlots(newBuckets, newSlots, oldData.NextAvailableSlotIndex);
}
/// <summary>
/// Initializes an empty set.
/// </summary>
/// <param name="initialSize">The initial number of strings the set can contain before having to resize its internal datastructures.</param>
public StringSet(int initialSize)
{
_data = new BucketsAndSlots(new int[initialSize], new Slot[initialSize], 0);
}