public IEnumerable <Product> Filter(IEnumerable <Product> items, Ispecification <Product> spec)
{
foreach (var p in items)
{
if (spec.IsSatisfied(p))
{
yield return(p);
}
}
}
public AndSpecification(Ispecification <T> first, Ispecification <T> second)
{
this.first = first;
this.second = second;
}