public static IEnumerable <Perm> Perms(this IPolyrand random, int len)
{
while (true)
{
yield return(random.Perm(len));
}
}
/// <summary>
/// Produces a stream of random permutation of natural length N
/// </summary>
/// <param name="random">The random source</param>
/// <param name="n">The length representative</param>
/// <param name="rep">A primal type representative</param>
/// <typeparam name="N">The length type</typeparam>
/// <typeparam name="T">The primal symbol type</typeparam>
public static IEnumerable <Perm <N> > Perms <N>(this IPolyrand random, N n = default)
where N : ITypeNat, new()
{
while (true)
{
yield return(random.Perm(n));
}
}