/// <summary>
/// Inserts a sequence of elements at the specified index.
/// </summary>
/// <param name="index">The index at which to insert. The element at this index is pushed forward.</param>
/// <param name="items">The items to insert. Faster if an array or a known collection type.</param>
/// <returns></returns>
public ImmVector <T> InsertRange(int index, IEnumerable <T> items)
{
index.CheckIsBetween("index", -Root.Length - 1, Root.Length);
items.CheckNotNull("items");
index = index < 0 ? index + Root.Length + 1: index;
if (index == 0)
{
return(AddFirstRange(items));
}
if (index == Length)
{
return(AddLastRange(items));
}
#if ASSERTS
var oldLast = Last;
var oldFirst = First;
#endif
var start = Root.Take(index - 1, Lineage.Immutable);
var lineage = Lineage.Mutable();
var len = 0;
var s = 0;
var oldLength = Length;
var arrInsert = items.ToArrayFast(out len);
if (len == 0)
{
return(this);
}
var arrAfter = new T[oldLength - index];
CopyTo(arrAfter, index, 0, oldLength - index);
var arrLength = len;
if (len == 0)
{
return(this);
}
if (oldLength + len >= MaxCapacity)
{
throw Errors.Capacity_exceeded();
}
start = start.AddRange(arrInsert, lineage, 6, ref s, ref len);
len = oldLength - index;
s = 0;
start = start.AddRange(arrAfter, lineage, 6, ref s, ref len);
ImmVector <T> ret = start;
#if ASSERTS
ret.Length.AssertEqual(oldLength + arrLength);
ret.RecursiveLength().AssertEqual(ret.Length);
ret.Last.AssertEqual(oldLast);
ret.First.AssertEqual(oldFirst);
ret[index].AssertEqual(arrInsert[0]);
ret[index + arrLength - 1].AssertEqual(arrInsert[arrLength - 1]);
#endif
return(ret);
}
/// <summary>
/// Adds the specified element to the end of the vector. O(logn), fast.
/// </summary>
/// <param name="item">The item to add.</param>
/// <returns>ImmVector{`0}.</returns>
/// <exception cref="InvalidOperationException">Thrown if the data structure exceeds its maximum capacity.</exception>
public ImmVector <T> AddLast(T item)
{
#if ASSERTS
var expected = Length + 1;
#endif
if (Root.Length >= MaxCapacity)
{
throw Errors.Capacity_exceeded();
}
ImmVector <T> ret = Root.Add(item, Lineage.Immutable);
#if ASSERTS
ret.Last.AssertEqual(item);
ret.Length.AssertEqual(expected);
#endif
return(ret);
}
/// <summary>
/// Removes the last item from the collection.
/// </summary>
/// <exception cref="InvalidOperationException">Thrown if the data structure is empty.</exception>
public ImmVector <T> RemoveLast()
{
if (Root.Length == 0)
{
throw Errors.Is_empty;
}
#if ASSERTS
var expected = Length - 1;
#endif
var lineage = Lineage.Immutable;
ImmVector <T> ret = Root.RemoveLast(lineage);
#if ASSERTS
ret.Length.AssertEqual(expected);
if (Length > 1)
{
ret.Last.AssertEqual(this[-2]);
}
#endif
return(ret);
}
/// <summary>
/// Adds a sequence of items to the end of the collection.
/// </summary>
/// <param name="items">A sequence of items to add. Faster if the sequence is an array or a known collection type.</param>
/// <exception cref="ArgumentNullException">Thrown if the argument is null.</exception>
/// <exception cref="InvalidOperationException">Thrown if the collection exceeds its capacity.</exception>
/// <remarks>This member performs a lot better when the specified sequence is an array.</remarks>
public ImmVector <T> AddLastRange(IEnumerable <T> items)
{
items.CheckNotNull("items");
#if ASSERTS
var expected = Length;
var oldLast = TryLast;
#endif
var len = 0;
var s = 0;
if (IsEmpty)
{
var asVector = items as ImmVector <T>;
if (asVector != null)
{
return(asVector);
}
}
var arr = items.ToArrayFast(out len);
var oldLen = len;
if (Root.Length + len >= MaxCapacity)
{
throw Errors.Capacity_exceeded();
}
ImmVector <T> ret = Root.AddRange(arr, Lineage.Mutable(), 6, ref s, ref len);
#if ASSERTS
ret.Length.AssertEqual(expected + oldLen);
if (arr.Length > 0 && oldLen > 0)
{
ret.Last.AssertEqual(arr[oldLen - 1]);
}
else if (oldLast.IsSome)
{
ret.Last.AssertEqual(oldLast.Value);
}
#endif
return(ret);
}
internal Builder(ImmVector <T> inner)
{
_inner = inner.Root;
_lineage = Lineage.Mutable();
}
protected override ISequentialBuilder <T, ImmVector <T> > BuilderFrom(ImmVector <T> collection)
{
return(new Builder(collection));
}
public VectorDebugView(ImmVector <T> arr)
{
View = new SequentialDebugView <T>(arr);
}
