internal static void Share()
{
IEnumerable <int> sequence = Enumerable.Range(0, 5);
IEnumerator <int> independentIterator1 = sequence.GetEnumerator();
IEnumerator <int> independentIterator2 = sequence.GetEnumerator();
independentIterator1.MoveNext(); independentIterator1.Current.WriteLine(); // 0| |
independentIterator2.MoveNext(); independentIterator2.Current.WriteLine(); // |0|
independentIterator1.MoveNext(); independentIterator1.Current.WriteLine(); // 1| |
IEnumerator <int> independentIterator3 = sequence.GetEnumerator(); // | |
independentIterator3.MoveNext(); independentIterator3.Current.WriteLine(); // | |0
independentIterator1.MoveNext(); independentIterator1.Current.WriteLine(); // 2| |
independentIterator2.MoveNext(); independentIterator2.Current.WriteLine(); // |1|
// ...
IBuffer <int> share = Enumerable.Range(0, 5).Share();
IEnumerator <int> sharedIterator1 = share.GetEnumerator();
IEnumerator <int> sharedIterator2 = share.GetEnumerator();
sharedIterator1.MoveNext(); sharedIterator1.Current.WriteLine(); // 0| |
sharedIterator2.MoveNext(); sharedIterator2.Current.WriteLine(); // |1|
sharedIterator1.MoveNext(); sharedIterator1.Current.WriteLine(); // 2| |
IEnumerator <int> sharedIterator3 = share.GetEnumerator(); // | |
sharedIterator3.MoveNext(); sharedIterator3.Current.WriteLine(); // | |3
share.Dispose();
sharedIterator1.MoveNext(); // ObjectDisposedException.
sharedIterator2.MoveNext(); // ObjectDisposedException.
sharedIterator3.MoveNext(); // ObjectDisposedException.
}
internal static void DesugaredZipShared()
{
IEnumerable <int> source1 = Enumerable.Range(0, 5);
IEnumerable <(int, int)> Zip1()
{
using (IEnumerator <int> independentIterator1 = source1.GetEnumerator())
using (IEnumerator <int> independentIterator2 = source1.GetEnumerator())
{
while (independentIterator1.MoveNext() && independentIterator2.MoveNext())
{
yield return(independentIterator1.Current, independentIterator2.Current);
// Yield (0, 0) (1, 1) (2, 2) (3, 3) (4, 4).
}
}
}
Zip1().WriteLines();
using (IBuffer <int> source2 = Enumerable.Range(0, 5).Share())
{
IEnumerable <(int, int)> Zip2()
{
using (IEnumerator <int> sharedIterator1 = source2.GetEnumerator())
using (IEnumerator <int> sharedIterator2 = source2.GetEnumerator())
{
while (sharedIterator1.MoveNext() && sharedIterator2.MoveNext())
{
yield return(sharedIterator1.Current, sharedIterator2.Current);
// Yield (0, 1) (2, 3).
}
}
}
Zip2().WriteLines();
}
IEnumerable <int> source3 = Enumerable.Range(0, 5);
IEnumerable <(int, int)> Zip3()
{
using (IBuffer <int> source = source3.Share())
using (IEnumerator <int> sharedIterator1 = source.GetEnumerator())
using (IEnumerator <int> sharedIterator2 = source.GetEnumerator())
{
while (sharedIterator1.MoveNext() && sharedIterator2.MoveNext())
{
yield return(sharedIterator1.Current, sharedIterator2.Current);
// Yield (0, 1) (2, 3).
}
}
}
Zip3().WriteLines();
}
internal static void Publish2()
{
IBuffer <int> publish = Enumerable.Range(0, 5).Publish();
IEnumerator <int> iterator1 = publish.GetEnumerator();
// iterator1: 0 1 2 3 4
IEnumerator <int> iterator2 = publish.GetEnumerator();
// iterator1: 0 1 2 3 4
iterator1.MoveNext(); iterator1.Current.WriteLine(); // 0| |Trace: 0
iterator1.MoveNext(); iterator1.Current.WriteLine(); // 1| |Trace: 1
iterator1.MoveNext(); iterator1.Current.WriteLine(); // 2| |Trace: 2
iterator2.MoveNext(); iterator2.Current.WriteLine(); // |0|
iterator1.MoveNext(); iterator1.Current.WriteLine(); // 3| |Trace: 3
iterator2.MoveNext(); iterator2.Current.WriteLine(); // |1|
iterator1.MoveNext(); iterator1.Current.WriteLine(); // 4| |Trace: 4
publish.Dispose();
iterator1.MoveNext(); // ObjectDisposedException.
iterator2.MoveNext(); // ObjectDisposedException.
}
internal static void Publish()
{
using (IBuffer <int> publish = Enumerable.Range(0, 5).Publish())
{
IEnumerator <int> remainderIteratorA = publish.GetEnumerator();
// remainderIteratorA: 0 1 2 3 4. A|B|C
remainderIteratorA.MoveNext(); remainderIteratorA.Current.WriteLine(); // 0| |
remainderIteratorA.MoveNext(); remainderIteratorA.Current.WriteLine(); // 1| |
remainderIteratorA.MoveNext(); remainderIteratorA.Current.WriteLine(); // 2| |
IEnumerator <int> remainderIteratorB = publish.GetEnumerator(); // | |
// remainderIteratorB: 3 4. | |
remainderIteratorB.MoveNext(); remainderIteratorB.Current.WriteLine(); // |3|
remainderIteratorA.MoveNext(); remainderIteratorA.Current.WriteLine(); // 3| |
IEnumerator <int> remainderIteratorC = publish.GetEnumerator(); // | |
// remainderIteratorC: 4. | |
remainderIteratorB.MoveNext(); remainderIteratorB.Current.WriteLine(); // |4|
remainderIteratorA.MoveNext(); remainderIteratorA.Current.WriteLine(); // 4| |
remainderIteratorC.MoveNext(); remainderIteratorC.Current.WriteLine(); // | |4
}
}
internal static void Publish()
{
IBuffer <int> publish = TracedRange(0, 5).Publish();
IEnumerator <int> iterator1 = publish.GetEnumerator();
// iterator1: 0 1 2 3 4
iterator1.MoveNext(); Trace.WriteLine(iterator1.Current); // 0| |Trace: 0
iterator1.MoveNext(); Trace.WriteLine(iterator1.Current); // 1| |Trace: 1
iterator1.MoveNext(); Trace.WriteLine(iterator1.Current); // 2| |Trace: 2
IEnumerator <int> iterator2 = publish.GetEnumerator(); // | |
// iterator2: 3 4 | |
iterator2.MoveNext(); Trace.WriteLine(iterator2.Current); // |3|Trace: 3
iterator1.MoveNext(); Trace.WriteLine(iterator1.Current); // 3| |
iterator2.MoveNext(); Trace.WriteLine(iterator2.Current); // |4|Trace: 4
iterator1.MoveNext(); Trace.WriteLine(iterator1.Current); // 4| |
// Trace: 0 1 2 3 4.
publish.Dispose();
iterator1.MoveNext(); // ObjectDisposedException.
iterator2.MoveNext(); // ObjectDisposedException.
}
internal static void Memoize()
{
using (IBuffer <int> memoize = Enumerable.Range(0, 5).Memoize())
{
IEnumerator <int> bufferIteratorA = memoize.GetEnumerator();
// bufferIteratorA: 0 1 2 3 4. A|B|C
bufferIteratorA.MoveNext(); bufferIteratorA.Current.WriteLine(); // 0| |
bufferIteratorA.MoveNext(); bufferIteratorA.Current.WriteLine(); // 1| |
bufferIteratorA.MoveNext(); bufferIteratorA.Current.WriteLine(); // 2| |
IEnumerator <int> bufferIteratorB = memoize.GetEnumerator(); // | |
// bufferIteratorB: 0 1 2 3 4. | |
bufferIteratorB.MoveNext(); bufferIteratorB.Current.WriteLine(); // |0|
bufferIteratorA.MoveNext(); bufferIteratorA.Current.WriteLine(); // 3| |
IEnumerator <int> bufferIteratorC = memoize.GetEnumerator(); // | |
// bufferIteratorC: 0 1 2 3 4. | |
bufferIteratorB.MoveNext(); bufferIteratorB.Current.WriteLine(); // |1|
bufferIteratorA.MoveNext(); bufferIteratorA.Current.WriteLine(); // 4| |
bufferIteratorC.MoveNext(); bufferIteratorC.Current.WriteLine(); // | |0
bufferIteratorC.MoveNext(); bufferIteratorC.Current.WriteLine(); // | |1
bufferIteratorB.MoveNext(); bufferIteratorB.Current.WriteLine(); // |2|
// ...
}
}
internal static void DesugaredConcatShared()
{
IEnumerable <int> source1 = Enumerable.Range(0, 5);
IEnumerable <int> Concat1() // source1.Concat(source1)
{
using (IEnumerator <int> independentIterator1 = source1.GetEnumerator())
{
while (independentIterator1.MoveNext())
{
yield return(independentIterator1.Current); // Yield 0 1 2 3 4.
}
}
using (IEnumerator <int> independentIterator2 = source1.GetEnumerator())
{
while (independentIterator2.MoveNext())
{
yield return(independentIterator2.Current); // Yield 0 1 2 3 4.
}
}
}
Concat1().WriteLines();
using (IBuffer <int> source2 = Enumerable.Range(0, 5).Share())
{
IEnumerable <int> Concat2() // source2.Concat(source2)
{
using (IEnumerator <int> sharedIterator1 = source2.GetEnumerator())
{
while (sharedIterator1.MoveNext())
{
yield return(sharedIterator1.Current); // Yield 0 1 2 3 4.
}
}
using (IEnumerator <int> sharedIterator2 = source2.GetEnumerator())
{
while (sharedIterator2.MoveNext())
{
yield return(sharedIterator2.Current); // Yield nothing.
}
}
}
Concat2().WriteLines();
}
IEnumerable <int> source3 = Enumerable.Range(0, 5);
IEnumerable <int> Concat3() // source3.Share(source => source.Concat(source))
{
using (IBuffer <int> source = source3.Share())
{
using (IEnumerator <int> sharedIterator1 = source.GetEnumerator())
{
while (sharedIterator1.MoveNext())
{
yield return(sharedIterator1.Current); // Yield 0 1 2 3 4.
}
}
using (IEnumerator <int> sharedIterator2 = source.GetEnumerator())
{
while (sharedIterator2.MoveNext())
{
yield return(sharedIterator2.Current); // Yield nothing.
}
}
}
}
Concat3().WriteLines();
}
