/*/// <summary>Maps a list to another list of the same length.</summary>
* /// <param name="map">A function that transforms each item in the list.</param>
* /// <returns>The list after the map function is applied to each item. The
* /// original VList structure is not modified.</returns>
* public WList<Out> Select<Out>(Func<T, Out> map)
* {
* WList<Out> newList = new WList<Out>();
* VListBlock<T>.Select<Out>(Block, LocalCount, map, newList);
* return newList;
* }*/
/// <summary>Transforms a list (combines filtering with selection and more).</summary>
/// <param name="x">Method to apply to each item in the list</param>
/// <returns>A list formed from transforming all items in the list</returns>
/// <remarks>See the documentation of FVList.Transform() for more information.</remarks>
public WList <T> Transform(VListTransformer <T> x)
{
WList <T> newList = new WList <T>();
VListBlock <T> .Transform(Block, LocalCount, x, true, newList);
return(newList);
}
/// <summary>Maps a list to another list of the same length.</summary>
/// <param name="map">A function that transforms each item in the list.</param>
/// <returns>The list after the map function is applied to each item. The
/// original VList structure is not modified.</returns>
public WList <Out> Select <Out>(Func <T, Out> map)
{
WList <Out> newList = new WList <Out>();
VListBlock <T> .Select <Out>(Block, LocalCount, map, newList);
return(newList);
}
public void TestInsertRemove()
{
WList <int> list = new WList <int>();
for (int i = 0; i <= 12; i++)
{
list.Insert(0, i);
}
ExpectList(list, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
for (int i = 1; i <= 6; i++)
{
list.RemoveAt(i);
}
ExpectList(list, 12, 10, 8, 6, 4, 2, 0);
Assert.AreEqual(0, list.Pop());
list.Insert(1, -2);
ExpectList(list, 12, -2, 10, 8, 6, 4, 2);
list.Insert(2, -1);
ExpectList(list, 12, -2, -1, 10, 8, 6, 4, 2);
Assert.That(list.Remove(-1));
Assert.That(list.Remove(12));
list[0] = 12;
ExpectList(list, 12, 10, 8, 6, 4, 2);
// Make sure WList.Clear doesn't disturb FVList
VList <int> v = list.WithoutLast(4);
list.Clear();
ExpectList(list);
ExpectList(v, 12, 10);
// Some simple InsertRange calls where some immutable items must be
// converted to mutable
VList <int> oneTwo = new VList <int>(1, 2);
VList <int> threeFour = new VList <int>(3, 4);
list = oneTwo.ToWList();
list.InsertRange(1, threeFour);
ExpectList(list, 1, 3, 4, 2);
list = threeFour.ToWList();
list.InsertRange(0, oneTwo);
ExpectList(list, 1, 2, 3, 4);
// More tests...
list.RemoveRange(2, 2);
ExpectList(list, 1, 2);
list.InsertRange(2, new int[] { 3, 3, 4, 4, 4, 5, 6, 7, 8, 9 });
ExpectList(list, 1, 2, 3, 3, 4, 4, 4, 5, 6, 7, 8, 9);
list.RemoveRange(3, 3);
ExpectList(list, 1, 2, 3, 4, 5, 6, 7, 8, 9);
v = list.ToVList();
list.RemoveRange(5, 4);
ExpectList(list, 1, 2, 3, 4, 5);
ExpectList(v, 1, 2, 3, 4, 5, 6, 7, 8, 9);
}
/// <summary>Maps a list to another list of the same length.</summary>
/// <param name="map">A function that transforms each item in the list.</param>
/// <returns>The list after the map function is applied to each item. The
/// original VList structure is not modified.</returns>
/// <remarks>
/// This method is called "Smart" because of what happens if the map
/// doesn't do anything. If the map function returns the first N items
/// unmodified (the items at the tail of the WList), those N items are
/// typically not copied, but shared between the existing list and the
/// new one.
/// </remarks>
public WList <T> SmartSelect(Func <T, T> map)
{
WList <T> newList = new WList <T>();
if (LocalCount != 0)
{
Block.SmartSelect(LocalCount, map, newList);
}
return(newList);
}
/// <summary>Applies a filter to a list, to exclude zero or more
/// items.</summary>
/// <param name="filter">A function that chooses which items to include
/// (exclude items by returning false).</param>
/// <returns>The list after filtering has been applied. The original VList
/// structure is not modified.</returns>
/// <remarks>
/// If the predicate keeps the first N items it is passed (which are the
/// last or "tail" items in a WList), those N items are typically not
/// copied, but shared between the existing list and the new one.
/// </remarks>
public WList <T> Where(Func <T, bool> filter)
{
WList <T> newList = new WList <T>();
if (LocalCount != 0)
{
Block.Where(LocalCount, filter, newList);
}
return(newList);
}
/// <summary>Filters and maps a list with a user-defined function.</summary>
/// <param name="filter">A function that chooses which items to include
/// in a new list, and what to change them to.</param>
/// <returns>The list after filtering has been applied. The original list
/// structure is not modified.</returns>
/// <remarks>
/// This is a smart function. If the filter does not modify the first N
/// items it is passed those N items are typically not copied, but shared
/// between the existing list and the new one.
/// </remarks>
public WList <T> WhereSelect(Func <T, Maybe <T> > filter)
{
WList <T> newList = new WList <T>();
if (LocalCount != 0)
{
Block.WhereSelect(LocalCount, filter, newList);
}
return(newList);
}
/// <summary>Applies a filter to a list, to exclude zero or more
/// items.</summary>
/// <param name="filter">A function that chooses which items to include
/// (exclude items by returning false).</param>
/// <returns>The list after filtering has been applied. The original VList
/// structure is not modified.</returns>
/// <remarks>
/// If the predicate keeps the first N items it is passed (which are the
/// last or "tail" items in a WList), those N items are typically not
/// copied, but shared between the existing list and the new one.
/// </remarks>
public WList <T> Where(Predicate <T> filter)
{
WList <T> newList = new WList <T>();
if (LocalCount != 0)
{
Block.Where(LocalCount, filter, newList);
}
return(newList);
}
public void TestMutabilification()
{
// Make a single block mutable
VList <int> v = new VList <int>(1, 0);
WList <int> w = v.ToWList();
ExpectList(w, 1, 0);
w[1] = 2;
ExpectList(w, 1, 2);
ExpectList(v, 1, 0);
// Make another block, make the front block mutable, then the block-of-2
v.Push(-1);
w = v.ToWList();
w[2] = 3;
ExpectList(w, 1, 0, 3);
Assert.That(w.WithoutLast(1) == v.WithoutLast(1));
w[1] = 2;
ExpectList(w, 1, 2, 3);
Assert.That(w.WithoutLast(1) != v.WithoutLast(1));
// Now for a more complicated case: create a long immutable chain by
// using a nasty access pattern, add a mutable block in front, then
// make some of the immutable blocks mutable. This will cause several
// immutable blocks to be consolidated into one mutable block,
// shortening the chain.
v = new VList <int>(6);
v = v.Add(-1).Tail.Add(5).Add(-1).Tail.Add(4).Add(-1).Tail.Add(3);
v = v.Add(-1).Tail.Add(2).Add(-1).Tail.Add(1).Add(-1).Tail.Add(0);
ExpectList(v, 6, 5, 4, 3, 2, 1, 0);
// At this point, every block in the chain has only one item (it's
// a linked list!) and the capacity of each block is 2.
Assert.AreEqual(7, v.BlockChainLength);
w = v.ToWList();
w.AddRange(new int[] { 1, 2, 3, 4, 5 });
Assert.AreEqual(w.Count, 12);
ExpectList(w, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5);
// Indices: 0 1 2 3 4 5 6 7 8 9 10 11
// Blocks: H| G| F| E| D| C| B | block A (front of chain)
Assert.AreEqual(8, w.BlockChainLength);
Assert.AreEqual(4, w.LocalCount);
w[3] = -3;
ExpectList(w, 6, 5, 4, -3, 2, 1, 0, 1, 2, 3, 4, 5);
// Indices: 0 1 2 3 4 5 6 7 8 9 10 11
// Blocks: H| G| F| block I | block A (front of chain)
Assert.AreEqual(5, w.BlockChainLength);
}
public void TestFork()
{
WList <int> A = new WList <int>();
A.AddRange(new int[] { 1, 2, 3 });
WList <int> B = A.Clone();
A.Push(4);
ExpectList(B, 1, 2, 3);
ExpectList(A, 1, 2, 3, 4);
B.Push(-4);
ExpectList(B, 1, 2, 3, -4);
Assert.That(A.WithoutLast(2) == B.WithoutLast(2));
}
public void TestWhere()
{
WList <int> one = new WList <int>(); one.Add(3);
WList <int> two = one.Clone(); two.Add(2);
WList <int> thr = two.Clone(); thr.Add(1);
ExpectList(one.Where(delegate(int i) { return(false); }));
ExpectList(two.Where(delegate(int i) { return(false); }));
ExpectList(thr.Where(delegate(int i) { return(false); }));
Assert.That(one.Where(delegate(int i) { return(true); }).ToVList() == one.ToVList());
Assert.That(two.Where(delegate(int i) { return(true); }).ToVList() == two.ToVList());
Assert.That(thr.Where(delegate(int i) { return(true); }).ToVList() == thr.ToVList());
Assert.That(two.Where(delegate(int i) { return(i == 3); }).ToVList() == two.WithoutLast(1));
Assert.That(thr.Where(delegate(int i) { return(i == 3); }).ToVList() == thr.WithoutLast(2));
Assert.That(thr.Where(delegate(int i) { return(i > 1); }).ToVList() == thr.WithoutLast(1));
ExpectList(two.Where(delegate(int i) { return(i == 2); }), 2);
ExpectList(thr.Where(delegate(int i) { return(i == 2); }), 2);
}
public void TestSelect()
{
WList <int> one = new WList <int>(); one.Add(3);
WList <int> two = one.Clone(); two.Add(2);
WList <int> thr = two.Clone(); thr.Add(1);
ExpectList(thr, 3, 2, 1);
Assert.That(one.SmartSelect(delegate(int i) { return(i); }).ToVList() == one.ToVList());
Assert.That(two.SmartSelect(delegate(int i) { return(i); }).ToVList() == two.ToVList());
Assert.That(thr.SmartSelect(delegate(int i) { return(i); }).ToVList() == thr.ToVList());
ExpectList(one.SmartSelect(delegate(int i) { return(i + 1); }), 4);
ExpectList(two.SmartSelect(delegate(int i) { return(i + 1); }), 4, 3);
ExpectList(thr.SmartSelect(delegate(int i) { return(i + 1); }), 4, 3, 2);
ExpectList(two.SmartSelect(delegate(int i) { return(i == 3 ? 3 : 0); }), 3, 0);
ExpectList(thr.SmartSelect(delegate(int i) { return(i == 3 ? 3 : 0); }), 3, 0, 0);
ExpectList(thr.SmartSelect(delegate(int i) { return(i == 1 ? 0 : i); }), 3, 2, 0);
Assert.That(thr.SmartSelect(delegate(int i) { return(i == 1 ? 0 : i); }).WithoutLast(1) == thr.WithoutLast(1));
}
private void TestTransform(int count, int[] expect, int commonTailLength, params XfAction[] actions)
{
WList <int> list = new WList <int>();
for (int i = 0; i < count; i++)
{
list.Add(i + 1);
}
int counter = 0;
WList <int> result =
list.Transform(delegate(int i, ref int item) {
if (i >= 0)
{
Assert.AreEqual(list[i], item);
}
item *= 10;
return(actions[counter++]);
});
Assert.AreEqual(counter, actions.Length);
ExpectList(result, expect);
Assert.That(result.WithoutLast(result.Count - commonTailLength)
== list.WithoutLast(list.Count - commonTailLength));
// Try to ensure there's no shared mutable memory by trashing the
// result starting at the head, and verifying the original list
for (int i = result.Count - 1; i >= 0; i--)
{
result[i] = -1;
}
Assert.AreEqual(count, list.Count);
for (int i = 0; i < count; i++)
{
Assert.AreEqual(i + 1, list[i]);
}
}
public void TestFalseOwnership()
{
// This test tries to make sure a WList doesn't get confused about what
// blocks it owns. It's possible for a WList to share a partially-mutable
// block that contains mutable items with another WList, but only one
// WList owns the items.
// Case 1: two WLists point to the same block but only one owns it:
//
// block 0
// owned by A
// |____3| block 1
// |____2| unowned
// A,B--->|Imm_1|--->|Imm_1|
// |____0| |____0|
//
// (The location of "Imm" in each block denotes the highest immutable
// item; this diagram shows there are two immutable items in each
// block)
WList <int> A = new WList <int>();
A.Resize(4);
for (int i = 0; i < 4; i++)
{
A[i] = i;
}
WList <int> B = A.Clone();
// B can't add to the second block because it's not the owner, so a
// third block is created when we Add(1).
B.Add(4);
A.Add(-4);
ExpectList(A, 0, 1, 2, 3, -4);
ExpectList(B, 0, 1, 2, 3, 4);
Assert.AreEqual(2, A.BlockChainLength);
Assert.AreEqual(3, B.BlockChainLength);
// Case 2: two WLists point to different blocks but they share a common
// tail, where one list owns part of the tail and the other does not:
//
// block 0
// owned by B
// |____8|
// |____7|
// |____6|
// |____5| block 1
// |____4| owned by A
// |____3| A |____3| block 2
// |____2| | |____2| unowned
// |____1|---+---->|Imm_1|---->|Imm_1|
// B--->|____0| |____0| |____0|
// mutable
//
// Actually the previous test puts us in just this state.
//
// I can't think of a test that uses the public interface to detect bugs
// in this case. The most important thing is that B._block.PriorIsOwned
// returns false.
Assert.That(B.IsOwner && !B.Block.PriorIsOwned);
Assert.That(A.IsOwner);
Assert.That(B.Block.Prior.ToVList() == A.WithoutLast(1));
}
public void SimpleTests()
{
// Tests simple adds and removes from the front of the list. It
// makes part of its tail immutable, but doesn't make it mutable
// again. Also, we test operations that don't modify the list.
WList <int> list = new WList <int>();
Assert.That(list.IsEmpty);
// create VListBlockOfTwo
list = new WList <int>(10, 20);
ExpectList(list, 10, 20);
// Add()
list.Clear();
list.Add(1);
Assert.That(!list.IsEmpty);
list.Add(2);
Assert.AreEqual(1, list.BlockChainLength);
list.Add(3);
Assert.AreEqual(2, list.BlockChainLength);
ExpectList(list, 1, 2, 3);
VList <int> snap = list.ToVList();
ExpectList(snap, 1, 2, 3);
// AddRange(), Push(), Pop()
list.Push(4);
list.AddRange(new int[] { 5, 6 });
ExpectList(list, 1, 2, 3, 4, 5, 6);
Assert.AreEqual(list.Pop(), 6);
ExpectList(list, 1, 2, 3, 4, 5);
list.RemoveRange(3, 2);
ExpectList(list, 1, 2, 3);
// Double the list
list.AddRange(list);
ExpectList(list, 1, 2, 3, 1, 2, 3);
list.RemoveRange(3, 3);
// Fill a third block
list.AddRange(new int[] { 4, 5, 6, 7, 8, 9 });
list.AddRange(new int[] { 10, 11, 12, 13, 14 });
ExpectList(list, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14);
// Remove(), enumerator
list.Remove(14);
list.Remove(13);
list.Remove(12);
list.Remove(11);
ExpectListByEnumerator(list, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
// IndexOutOfRangeException
AssertThrows <IndexOutOfRangeException>(delegate() { int i = list[-1]; });
AssertThrows <IndexOutOfRangeException>(delegate() { int i = list[10]; });
AssertThrows <IndexOutOfRangeException>(delegate() { list.Insert(-1, -1); });
AssertThrows <IndexOutOfRangeException>(delegate() { list.Insert(list.Count + 1, -1); });
AssertThrows <IndexOutOfRangeException>(delegate() { list.RemoveAt(-1); });
AssertThrows <IndexOutOfRangeException>(delegate() { list.RemoveAt(list.Count); });
// Front, Contains, IndexOf
Assert.That(list.Last == 10);
Assert.That(list.Contains(9));
Assert.That(list[list.IndexOf(2)] == 2);
Assert.That(list[list.IndexOf(9)] == 9);
Assert.That(list[list.IndexOf(7)] == 7);
Assert.That(list.IndexOf(-1) == -1);
// snap is still the same
ExpectList(snap, 1, 2, 3);
}