public static ListIterator <T> SetDifference <T>(
this ListIterator <T> first1,
ListIterator <T> last1,
ListIterator <T> first2,
ListIterator <T> last2,
ListIterator <T> result,
Func <T, T, bool> comp
)
{
while (first1.NotEqual(last1) && first2.NotEqual(last2))
{
if (comp(first1.GetCurrent(), first2.GetCurrent()))
{
result.SetCurrent(first1.GetCurrent());
result = result.GetNext();
first1 = first1.GetNext();
}
else if (comp(first2.GetCurrent(), first1.GetCurrent()))
{
first2 = first2.GetNext();
}
else
{
first1 = first1.GetNext();
first2 = first2.GetNext();
}
}
return(first1.Copy(last1, result));
}
public static ListIterator <T> Merge <T>(
this ListIterator <T> first1,
ListIterator <T> last1,
ListIterator <T> first2,
ListIterator <T> last2,
ListIterator <T> result,
Func <T, T, bool> comp
)
{
while (true)
{
if (first1.IsEqual(last1))
{
return(first2.Copy(last2, result));
}
if (first2.IsEqual(last2))
{
return(first1.Copy(last1, result));
}
if (comp(first2.GetCurrent(), first1.GetCurrent()))
{
result.SetCurrent(first2.GetCurrent());
first2 = first2.GetNext();
}
else
{
result.SetCurrent(first1.GetCurrent());
first1 = first1.GetNext();
}
result = result.GetNext();
}
}