public override IEnumerator GetEnumerator()
{
IEnumerator e;
lock (root)
{
e = deque.GetEnumerator();
}
return(e);
}
public void Enumerator()
{
var deque = new Deque<int>(new[] { 2, 3, 4 });
Assert.IsNotNull(((IEnumerable<int>)deque).GetEnumerator());
Assert.IsNotNull(((IEnumerable)deque).GetEnumerator());
Deque<int>.Enumerator enumerator = deque.GetEnumerator();
Assert.AreEqual(0, enumerator.Current);
Assert.That(() => ((IEnumerator)enumerator).Current, Throws.TypeOf<InvalidOperationException>());
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(2, enumerator.Current);
Assert.AreEqual(2, ((IEnumerator)enumerator).Current);
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(3, enumerator.Current);
Assert.AreEqual(3, ((IEnumerator)enumerator).Current);
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(4, enumerator.Current);
Assert.AreEqual(4, ((IEnumerator)enumerator).Current);
Assert.IsFalse(enumerator.MoveNext());
Assert.AreEqual(0, enumerator.Current);
Assert.That(() => ((IEnumerator)enumerator).Current, Throws.TypeOf<InvalidOperationException>());
enumerator.Reset();
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(2, enumerator.Current);
enumerator.Dispose();
Assert.AreEqual(0, enumerator.Current);
Assert.IsFalse(enumerator.MoveNext());
Assert.That(() => ((IEnumerator)enumerator).Current, Throws.TypeOf<InvalidOperationException>());
enumerator = deque.GetEnumerator();
enumerator.MoveNext();
deque.EnqueueTail(5);
Assert.That(() => enumerator.MoveNext(), Throws.TypeOf<InvalidOperationException>());
Assert.That(() => enumerator.Reset(), Throws.TypeOf<InvalidOperationException>());
}
private static void TestEnumerator(Deque deque)
{
deque.Clear();
PopulateDequePushBack(deque);
IEnumerator e = deque.GetEnumerator();
try
{
object obj = e.Current;
Debug.Fail("Exception failed");
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
try
{
foreach(object obj in deque)
{
Debug.Assert(e.MoveNext());
}
Debug.Assert(!e.MoveNext());
object o = e.Current;
Debug.Fail("Exception failed");
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
try
{
e.Reset();
foreach(object obj in deque)
{
Debug.Assert(e.MoveNext());
}
Debug.Assert(!e.MoveNext());
object o = e.Current;
Debug.Fail("Exception failed");
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
try
{
deque.PushBack(deque.Count);
e.Reset();
Debug.Fail("Exception failed");
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
try
{
e.MoveNext();
Debug.Fail("Exception failed");
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
}