public IEnumerable <Product> Filter(IEnumerable <Product> items, BaseSpecification <Product> specification)
{
foreach (var item in items)
{
if (specification.IsSutisfied(item))
{
yield return(item);
}
}
}
public AndSpecification(BaseSpecification <T> first, BaseSpecification <T> second)
{
_first = first;
_second = second;
}