/// <summary>
/// Retains only the elements in this list that are Contained in
/// the specified collection. In other words, Removes from this
/// list all the elements that are not Contained in the specified
/// collection.
/// </summary>
/// <param name="c">collection that defines which elements this Set will retain.</param>
/// <returns>return true if this list Changed as a result of the call.</returns>
public bool RetainAll(IntList c)
{
bool rval = false;
for (int j = 0; j < _limit;)
{
if (!c.Contains(_array[j]))
{
Remove(j);
rval = true;
}
else
{
j++;
}
}
return(rval);
}