/// <summary>Returns this list as an RVList; if this is a FWList, the order
/// of the elements is reversed at the same time.</summary>
/// <remarks>This operation marks the items of the FWList or RWList as
/// immutable. You can still modify the list afterward, but some or all
/// of the list may have to be copied.</remarks>
protected RVList <T> ToRVList()
{
if (IsOwner)
{
return(VListBlock <T> .EnsureImmutable(Block, LocalCount).ToRVList());
}
else
{
return(InternalVList.ToRVList());
}
}
protected void InsertRangeAtDff(int distanceFromFront, IList <T> items, bool isRWList)
{
int count = items.Count; // (may throw NullReferenceException)
if ((uint)distanceFromFront > (uint)Count)
{
throw new IndexOutOfRangeException();
}
if (items == this)
{
// Inserting a copy of the list into itself requires some care...
if (distanceFromFront == 0)
{
// this sublist won't change during the insert
if (isRWList)
{
items = InternalVList.ToRVList();
}
else
{
items = InternalVList;
}
}
else
{
items = ToFVList(); // get an immutable version
}
}
VListBlock <T> .EnsureMutable(this, distanceFromFront);
VListBlock <T> .MuAddEmpty(this, count);
VListBlock <T> .MuMove(this, count, 0, distanceFromFront);
if (isRWList)
{
// Add items in forward order for RWList
for (int i = 0; i < count; i++)
{
SetAtDff(distanceFromFront + count - 1 - i, items[i]);
}
}
else
{
// Add items in reverse order for FWList
for (int i = 0; i < count; i++)
{
SetAtDff(distanceFromFront + i, items[i]);
}
}
}
