public static void SetItem <T>(ref this(T, T, T, T) quad, int i, T value)
{
switch (i)
{
default: throw new System.ArgumentException(string.Format("Bad index: {0}", i));
case 0: quad.Item1 = value; break;
case 1: quad.Item2 = value; break;
case 2: quad.Item3 = value; break;
case 3: quad.Item4 = value; break;
}
}
public static bool Set <T>(ref this(T[] items, int count) source, int index, T item)
