1namespace jive
 2{
 3  public class NotSpecification<T> : Specification<T>
 4  {
 5    readonly Specification<T> item_to_match;
 6
 7    public NotSpecification(Specification<T> item_to_match)
 8    {
 9      this.item_to_match = item_to_match;
10    }
11
12    public bool is_satisfied_by(T item)
13    {
14      return !item_to_match.is_satisfied_by(item);
15    }
16  }
17}