private Node MutateOrCreate(TValue value, Node left, Node right, Lineage lin)
{
if (_lineage.AllowMutation(lin))
{
Value = value;
Left = left;
Right = right;
Height = left.Height > right.Height ? left.Height + 1 : right.Height + 1;
Count = 1 + left.Count + right.Count;
return(this);
}
else
{
return(new Node(Key, value, left, right, Comparer, lin));
}
}
/// <summary>
/// Removes the last element.
/// </summary>
/// <param name="lineage"></param>
/// <returns></returns>
public override Node RemoveLast(Lineage lineage)
{
#if ASSERTS
var oldLength = Length;
var oldArrSize = ArrSize;
var beforeLast = Length > 1 ? Optional.Some(this[Length - 2]) : Optional.None;
#endif
Node ret;
if (Lineage.AllowMutation(lineage))
{
ret = Remove_MUTATES();
}
else
{
var newArr = Arr.Resize(ArrSize - 1);
ret = new Leaf(newArr, lineage, ArrSize - 1);
}
#if ASSERTS
ret.Length.AssertEqual(oldLength - 1);
ret.ArrSize.AssertEqual(oldArrSize - 1);
if (beforeLast.IsSome)
{
ret[ret.Length - 1].AssertEqual(beforeLast.Value);
}
#endif
return(ret);
}
public Node WithBucket(Bucket newBucket, Lineage lineage)
{
if (Lineage.AllowMutation(lineage))
{
Bucket = newBucket;
Count = Left.Count + Right.Count + newBucket.Count;
return(this);
}
return(new Node(Hash, newBucket, Left, Right, newBucket.Eq, lineage));
}
Node MutateOrCreate(int count, int arrSize, Node[] arr, Lineage lineage)
{
var ret = Lineage.AllowMutation(lineage)
? _mutate(count, arrSize, arr) : new Parent(Height, count, arr, lineage, arrSize);
#if ASSERTS
ret.Length.AssertEqual(arr.Resize(ret.ArrSize).Aggregate(0, (tot, cur) => cur != null ? tot + cur.Length : tot));
var leafIndex = Array.FindIndex(arr, node => node != null && !node.IsParent);
var parentIndex = Array.FindLastIndex(arr, node => node != null && node.IsParent);
leafIndex.AssertEqual(i => i == -1 || i > parentIndex);
#endif
return(ret);
}
Node[] UpdateStore(int index, Node v, Lineage lineage)
{
if (Lineage.AllowMutation(lineage))
{
if (Arr.Length < 32)
{
Arr = Arr.Resize(32);
}
Arr[index] = v;
return(Arr);
}
else
{
return(Arr.Update(index, v, ArrSize));
}
}
Node[] AddToStore(Node v, Lineage lineage)
{
if (Lineage.AllowMutation(lineage))
{
if (Arr.Length < 32)
{
Arr = Arr.Resize(32);
}
Arr[ArrSize] = v;
return(Arr);
}
else
{
var arr = Arr.Resize(ArrSize + 1);
arr[ArrSize] = v;
return(arr);
}
}
public override Digit Update(int index, Leaf <TValue> leaf, Lineage lineage)
{
if (Lineage.AllowMutation(lineage))
{
return(Update_MUTATES(index, leaf));
}
#if ASSERTS
leaf.AssertNotNull();
#endif
var whereIsThisIndex = WhereIsThisIndex(index);
TChild res;
switch (whereIsThisIndex)
{
case IN_START:
case IN_MIDDLE_OF_1:
res = First.Update(index, leaf, lineage);
return(CreateCheckNull(lineage, res, Second, Third, Fourth));
case IN_START_OF_2:
case IN_MIDDLE_OF_2:
res = Second.Update(index - First.Measure, leaf, lineage);
return(CreateCheckNull(lineage, First, res, Third, Fourth));
case IN_START_OF_3:
case IN_MIDDLE_OF_3:
res = Third.Update(index - First.Measure - Second.Measure, leaf, lineage);
return(CreateCheckNull(lineage, First, Second, res, Fourth));
case IN_START_OF_4:
case IN_MIDDLE_OF_4:
res = Fourth.Update(index - First.Measure - Second.Measure - Third.Measure, leaf, lineage);
return(CreateCheckNull(lineage, First, Second, Third, res));
case IN_END:
case OUTSIDE:
throw ImplErrors.Arg_out_of_range("index", index);
default:
throw ImplErrors.Invalid_execution_path("Checked all index locations.");
}
}
Node MutateOrCreate(int arrSize, TValue[] arr, Lineage lineage)
{
return(Lineage.AllowMutation(lineage) ? _mutate(arr, arrSize) : new Leaf(arr, lineage, arrSize));
}
private Digit MutateOrCreate(TChild a, TChild b, TChild c, TChild d, Lineage lineage)
{
return(Lineage.AllowMutation(lineage)
? _mutate(a.Measure + b.Measure + c.Measure + d.Measure, 4, a, b, c, d) : new Digit(a, b, c, d, lineage));
}
private Digit MutateOrCreate(TChild a, TChild b, Lineage lineage)
{
return(Lineage.AllowMutation(lineage) ? _mutate(a.Measure + b.Measure, 2, a, b) : new Digit(a, b, lineage));
}
private Digit MutateOrCreate(TChild a, Lineage lineage)
{
return(Lineage.AllowMutation(lineage) ? _mutate(a.Measure, 1, a) : new Digit(a, lineage));
}
