public void DequeVsQueue()
{
var list = new List <int>();
var queue = new Queue <int>(new[] { 1, 2, 3, 4 });
queue.Enqueue(5);
Assert.Equal(new[] { 1, 2, 3, 4, 5 }, queue);
queue = new Queue <int>();
queue.Enqueue(1);
queue.Enqueue(2);
Assert.Equal(new[] { 1, 2 }, queue);
Assert.Equal(new[] { 1, 2 }, queue.ToArray());
var deque = new Deque <int>();
deque.AddLast(1);
deque.AddLast(2);
Assert.Equal(new[] { 1, 2 }, deque);
Assert.Equal(new[] { 1, 2 }, deque.ToArray());
Assert.Equal(queue, deque);
list.Clear();
deque.ForEach((item, lst) => lst.Add(item), list);
Assert.Equal(queue, list);
deque = new Deque <int>(true);
deque.AddLast(1);
deque.AddLast(2);
Assert.Equal(new[] { 2, 1 }, deque);
Assert.Equal(new[] { 1, 2 }, deque.ToArray());
list.Clear();
deque.ForEach((item, lst) => lst.Add(item), list);
Assert.Equal(queue, list);
deque = new Deque <int>();
deque.AddFirst(1);
deque.AddFirst(2);
Assert.Equal(new[] { 2, 1 }, deque);
Assert.Equal(new[] { 2, 1 }, deque.ToArray());
list.Clear();
deque.Reverse((item, lst) => lst.Add(item), list);
Assert.Equal(queue, list);
deque = new Deque <int>(true);
deque.AddFirst(1);
deque.AddFirst(2);
Assert.Equal(new[] { 1, 2 }, deque);
Assert.Equal(new[] { 2, 1 }, deque.ToArray());
list.Clear();
deque.Reverse((item, lst) => lst.Add(item), list);
Assert.Equal(queue, list);
}
public void DequeVsStack()
{
var list = new List <int>();
var stack = new Stack <int>(new[] { 1, 2, 3, 4 });
stack.Push(5);
Assert.Equal(new[] { 5, 4, 3, 2, 1 }, stack);
stack = new Stack <int>();
stack.Push(1);
stack.Push(2);
Assert.Equal(new[] { 2, 1 }, stack);
Assert.Equal(new[] { 2, 1 }, stack.ToArray());
var deque = new Deque <int>();
deque.AddLast(1);
deque.AddLast(2);
Assert.Equal(new[] { 1, 2 }, deque);
Assert.Equal(new[] { 1, 2 }, deque.ToArray());
list.Clear();
deque.Reverse((item, lst) => lst.Add(item), list);
Assert.Equal(stack, list);
deque = new Deque <int>(true);
deque.AddLast(1);
deque.AddLast(2);
Assert.Equal(new[] { 2, 1 }, deque);
Assert.Equal(new[] { 1, 2 }, deque.ToArray());
list.Clear();
deque.Reverse((item, lst) => lst.Add(item), list);
Assert.Equal(stack, list);
deque = new Deque <int>();
deque.AddFirst(1);
deque.AddFirst(2);
Assert.Equal(new[] { 2, 1 }, deque);
Assert.Equal(new[] { 2, 1 }, deque.ToArray());
list.Clear();
deque.ForEach((item, lst) => lst.Add(item), list);
Assert.Equal(stack, list);
deque = new Deque <int>(true);
deque.AddFirst(1);
deque.AddFirst(2);
Assert.Equal(new[] { 1, 2 }, deque);
Assert.Equal(new[] { 2, 1 }, deque.ToArray());
list.Clear();
deque.ForEach((item, lst) => lst.Add(item), list);
Assert.Equal(stack, list);
}
public void SetItem_Split_WritesElements()
{
var deque = new Deque <int>(new[] { 1, 2, 3 });
deque.RemoveLast();
deque.RemoveFirst();
deque.RemoveFirst();
deque.AddFirst(0);
deque.AddLast(1);
deque.AddLast(2);
deque[0] = 7;
deque[1] = 11;
deque[2] = 13;
Assert.Equal(new[] { 7, 11, 13 }, deque);
}
public void Constructor_CapacityOf0_PermitsAdd()
{
var deque = new Deque <int>(0);
deque.AddLast(13);
Assert.Equal(new[] { 13 }, deque);
}
public void Insert_AtCount_IsSameAsAddToBack()
{
var deque1 = new Deque <int>(new[] { 1, 2 });
var deque2 = new Deque <int>(new[] { 1, 2 });
deque1.Insert(deque1.Count, 0);
deque2.AddLast(0);
Assert.Equal(deque1, deque2);
}
public void Add_IsAddToBack()
{
var deque1 = new Deque <int>(new[] { 1, 2 });
var deque2 = new Deque <int>(new[] { 1, 2 });
((ICollection <int>)deque1).Add(3);
deque2.AddLast(3);
Assert.Equal(deque1, deque2);
}
public void Capacity_Set_WhenSplit_PreservesData()
{
var deque = new Deque <int>(new int[] { 1, 2, 3 });
deque.RemoveFirst();
deque.AddLast(4);
Assert.Equal(3, deque.Capacity);
deque.Capacity = 7;
Assert.Equal(7, deque.Capacity);
Assert.Equal(new[] { 2, 3, 4 }, deque);
}
public void RemoveAll()
{
var deque = new Deque <int>(new[] { 1, 2, 3, 4, 5, 6, 7, 8 });
Assert.Equal(4, deque.RemoveAll(_ => _ >= 4 && _ <= 7));
Assert.Equal(4, deque.Count);
Assert.Equal(new[] { 1, 2, 3, 8 }, deque);
deque = new Deque <int>(new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 });
Assert.Equal(9, deque.RemoveLast());
deque.AddFirst(0);
Assert.Equal(5, deque.RemoveAll(_ => _ >= 4 && _ <= 7 || _ == 1));
Assert.Equal(4, deque.Count);
Assert.Equal(new[] { 0, 2, 3, 8 }, deque);
deque = new Deque <int>(new[] { 1, 2, 3, 4, 5, 6, 7, 8 });
deque.RemoveFirst();
deque.AddLast(9);
Assert.Equal(8, deque.Capacity);
Assert.True(deque.IsSplit);
Assert.Equal(4, deque.RemoveAll(_ => _ >= 4 && _ <= 7));
Assert.Equal(4, deque.Count);
Assert.Equal(new[] { 2, 3, 8, 9 }, deque);
Assert.False(deque.IsSplit);
var list = new List <int>();
deque = new Deque <int>(new[] { 1, 2, 3, 4, 5, 6, 7, 8 });
var result = deque.TryRemoveFirst(list, 4);
Assert.True(result);
Assert.Equal(new[] { 1, 2, 3, 4 }, list);
Assert.Equal(new[] { 5, 6, 7, 8 }, deque);
list.Clear();
result = deque.TryRemoveLast(list, 3);
Assert.True(result);
Assert.Equal(new[] { 8, 7, 6 }, list);
Assert.Single(deque);
result = deque.TryRemoveLast(list, 4);
Assert.True(result);
Assert.Equal(new[] { 8, 7, 6, 5 }, list);
Assert.Empty(deque);
Assert.False(deque.TryRemoveFirst(list, 10));
Assert.False(deque.TryRemoveLast(list, 10));
}
public void ToArray_CopiesToNewArray()
{
var deque = new Deque <int>(new[] { 0, 1 });
deque.AddLast(13);
var result = deque.ToArray();
Assert.Equal(new[] { 0, 1, 13 }, result);
result = deque.ToList().ToArray();
Assert.Equal(new[] { 0, 1, 13 }, result);
deque = new Deque <int>();
deque.AddFirst(1);
deque.AddFirst(2);
deque.AddFirst(3);
result = deque.ToArray();
Assert.Equal(new[] { 3, 2, 1 }, result);
result = deque.ToList().ToArray();
Assert.Equal(new[] { 3, 2, 1 }, result);
}
private void InsertTest(IReadOnlyCollection <int> initial, IReadOnlyCollection <int> items)
#endif
{
var totalCapacity = initial.Count + items.Count;
for (int rotated = 0; rotated <= totalCapacity; ++rotated)
{
for (int index = 0; index <= initial.Count; ++index)
{
// Calculate the expected result using the slower List<int>.
var result = new List <int>(initial);
for (int i = 0; i != rotated; ++i)
{
var item = result[0];
result.RemoveAt(0);
result.Add(item);
}
result.InsertRange(index, items);
// First, start off the deque with the initial items.
var deque = new Deque <int>(initial);
// Ensure there's enough room for the inserted items.
deque.Capacity += items.Count;
// Rotate the existing items.
for (int i = 0; i != rotated; ++i)
{
var item = deque[0];
deque.RemoveFirst();
deque.AddLast(item);
}
// Do the insert.
deque.InsertRange(index, items);
// Ensure the results are as expected.
Assert.Equal(result, deque);
}
}
}
private void RemoveTest(IReadOnlyCollection <int> initial)
#endif
{
for (int count = 0; count <= initial.Count; ++count)
{
for (int rotated = 0; rotated <= initial.Count; ++rotated)
{
for (int index = 0; index <= initial.Count - count; ++index)
{
// Calculated the expected result using the slower List<int>.
var result = new List <int>(initial);
for (int i = 0; i != rotated; ++i)
{
var item = result[0];
result.RemoveAt(0);
result.Add(item);
}
result.RemoveRange(index, count);
// First, start off the deque with the initial items.
var deque = new Deque <int>(initial);
// Rotate the existing items.
for (int i = 0; i != rotated; ++i)
{
var item = deque[0];
deque.RemoveFirst();
deque.AddLast(item);
}
// Do the remove.
deque.RemoveRange(index, count);
// Ensure the results are as expected.
Assert.Equal(result, deque);
}
}
}
}
public void IndexOf_ItemPresentAndSplit_ReturnsItemIndex()
{
var deque = new Deque <int>(new[] { 1, 2, 3 });
Assert.Equal(3, deque.RemoveLast());
deque.AddFirst(0);
Assert.Equal(0, deque.IndexOf(0));
Assert.Equal(1, deque.IndexOf(1));
Assert.Equal(2, deque.IndexOf(2));
deque = new Deque <int>(new[] { 1, 2, 3 });
deque.TryRemoveLast(out var item);
Assert.Equal(3, item);
deque.AddFirst(0);
Assert.Equal(0, deque.IndexOf(0));
Assert.Equal(1, deque.IndexOf(1));
Assert.Equal(2, deque.IndexOf(2));
deque = new Deque <int>(new[] { 1, 2, 3 });
deque.TryRemoveLastIf(_ => true, out var item1);
Assert.Equal(3, item1);
deque.AddFirst(0);
Assert.Equal(0, deque.IndexOf(0));
Assert.Equal(1, deque.IndexOf(1));
Assert.Equal(2, deque.IndexOf(2));
deque = new Deque <int>(new[] { 1, 2, 3 });
Assert.Equal(1, deque.RemoveFirst());
deque.AddLast(4);
Assert.Equal(0, deque.IndexOf(2));
Assert.Equal(1, deque.IndexOf(3));
Assert.Equal(2, deque.IndexOf(4));
deque = new Deque <int>(new[] { 1, 2, 3 });
deque.TryRemoveFirst(out var item2);
Assert.Equal(1, item2);
deque.AddLast(4);
Assert.Equal(0, deque.IndexOf(2));
Assert.Equal(1, deque.IndexOf(3));
Assert.Equal(2, deque.IndexOf(4));
deque = new Deque <int>(new[] { 1, 2, 3 });
deque.TryRemoveFirstIf(_ => true, out var item3);
Assert.Equal(1, item3);
deque.AddLast(4);
Assert.Equal(0, deque.IndexOf(2));
Assert.Equal(1, deque.IndexOf(3));
Assert.Equal(2, deque.IndexOf(4));
deque = new Deque <int>(new[] { 1, 2, 3 });
Assert.Equal(1, deque.GetFirst());
Assert.Equal(3, deque.GetLast());
deque.TryGetFirst(out var first);
Assert.Equal(1, first);
deque.TryGetLast(out var last);
Assert.Equal(3, last);
deque.RemoveLast();
deque.RemoveFirst();
Assert.Equal(2, deque.GetFirst());
Assert.Equal(2, deque.GetLast());
deque.TryGetFirst(out first);
Assert.Equal(2, first);
deque.TryGetLast(out last);
Assert.Equal(2, last);
deque = new Deque <int>(new[] { 1, 2, 3, 4 });
deque.TryRemoveFirstUntil(_ => _ == 2, out first);
Assert.Equal(2, first);
Assert.Equal(1, deque.GetFirst());
Assert.Equal(4, deque.GetLast());
Assert.Equal(3, deque.Count);
Assert.False(deque.TryRemoveFirstUntil(_ => _ == 10, out first));
deque = new Deque <int>(new[] { 1, 2, 3, 4 });
deque.TryRemoveLastUntil(_ => _ == 3, out last);
Assert.Equal(3, last);
Assert.Equal(1, deque.GetFirst());
Assert.Equal(4, deque.GetLast());
Assert.Equal(3, deque.Count);
Assert.False(deque.TryRemoveLastUntil(_ => _ == 10, out first));
}
public void DequeVsList()
{
var deque = new Deque <int>(new[] { 1, 2, 3, 4 });
deque.AddLast(5);
Assert.Equal(new[] { 1, 2, 3, 4, 5 }, deque);
var queue = new Queue <int>(new[] { 1, 2, 3, 4 });
queue.Enqueue(5);
Assert.Equal(new[] { 1, 2, 3, 4, 5 }, queue);
var stack = new Stack <int>(new[] { 1, 2, 3, 4 });
stack.Push(5);
Assert.Equal(new[] { 5, 4, 3, 2, 1 }, stack);
var lstComparer = new List <int>();
deque.ForEach((item, lst) => lst.Add(item), lstComparer);
Assert.Equal(new[] { 1, 2, 3, 4, 5 }, lstComparer);
lstComparer.Clear();
deque.Reverse((item, lst) => lst.Add(item), lstComparer);
Assert.Equal(new[] { 5, 4, 3, 2, 1 }, lstComparer);
lstComparer = queue.ToList();
Assert.Equal(new[] { 1, 2, 3, 4, 5 }, lstComparer);
lstComparer = queue.Reverse().ToList();
Assert.Equal(new[] { 5, 4, 3, 2, 1 }, lstComparer);
lstComparer = stack.ToList();
Assert.Equal(new[] { 5, 4, 3, 2, 1 }, lstComparer);
lstComparer = stack.Reverse().ToList();
Assert.Equal(new[] { 1, 2, 3, 4, 5 }, lstComparer);
var list = new List <int>(new[] { 1, 2 });
Assert.Equal(new[] { 1, 2 }, list);
Assert.Equal(new[] { 1, 2 }, list.ToArray());
deque = new Deque <int>();
deque.AddLast(1);
deque.AddLast(2);
Assert.Equal(new[] { 1, 2 }, deque);
Assert.Equal(new[] { 1, 2 }, deque.ToArray());
Assert.Equal(list, deque);
deque = new Deque <int>(true);
deque.AddLast(1);
deque.AddLast(2);
Assert.Equal(new[] { 2, 1 }, deque);
Assert.Equal(new[] { 1, 2 }, deque.ToArray());
deque = new Deque <int>();
deque.AddFirst(1);
deque.AddFirst(2);
Assert.Equal(new[] { 2, 1 }, deque);
Assert.Equal(new[] { 2, 1 }, deque.ToArray());
deque = new Deque <int>(true);
deque.AddFirst(1);
deque.AddFirst(2);
Assert.Equal(new[] { 1, 2 }, deque);
Assert.Equal(new[] { 2, 1 }, deque.ToArray());
Assert.Equal(list, deque);
}