private static RndResult <IEnumerable <A> > NoRepeat <A>(int count, int tries, IRnd <A> rnd) where A : IEquatable <A>
{
A last = default(A);
A[] arr = new A[count];
for (int i = 0; i < count; i++)
{
var res = i == 0
? rnd.Next(tries)
: rnd.Where(a => !a.Equals(last)).Next(tries);
if (!res.WasSuccessful)
{
return(new RndResult <IEnumerable <A> >());
}
last = res.Result;
arr[i] = last;
}
return(new RndResult <IEnumerable <A> >(arr));
}
