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John Fitzgerald Kennedy Joseph Patrick Kennedy Patrick Joseph Kennedy Mary Augusta Hickey Rose Elizabeth Fitzgerald John Francis Fitzgerald Mary Josephine Hannon
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struct versus class
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An interesting side effect of defining Pair<T> as a struct rather than a class is that SubItemsFirst and SubItemsSecond cannot be assigned directly The following will produce a compile error indicating that SubItems cannot be modified, "because it is not a variable" jfkFamilyTreeSubItemsFirst = new BinaryTree<string>("Joseph Patrick Kennedy");
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The issue is that SubItems is a property of type Pair<T>, a struct Therefore, when the property returns the value, a copy of _SubItems is made, and assigning First on a copy that is promptly lost at the end of the statement would be misleading Fortunately, the C# compiler prevents this To overcome the issue don't assign it (see the approach in Listing 1223), use class rather than struct for Pair<T>, don't create a SubItems property and instead use a field, or provide properties in BinaryTree<T> that give direct access to _SubItems members
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Canceling Further Iteration: yield break
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Sometimes you might want to cancel further iteration You can do this by including an if statement so that no further statements within the code are executed However, you can also jump back to the call site, causing MoveNext() to return false Listing 1224 shows an example of such a method
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Listing 1224 Escaping Iteration via yield break
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public SystemCollectionsGenericIEnumerable<T> GetNotNullEnumerator() { if((First == null) || (Second == null)) { yield break; } yield return Second; yield return First; }
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This method cancels the iteration if either of the elements in the Pair<T> class is null A yield break statement is similar to placing a return statement at the top of a function when it is determined there is no work to do It is a way to exit from further iterations without surrounding all remaining code with an if block As such, it allows multiple exits, and therefore, you should use it with caution because casual reading of the code may miss the early exit
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How Iterators Work When the C# compiler encounters an iterator, it expands the code into the appropriate CIL for the corresponding enumerator design pattern In the generated code, the C# compiler first creates a nested private class to implement the IEnumerator<T> interface, along with its Current property and a MoveNext() method The Current property returns a type corresponding to the return type of the iterator Listing 1220 of Pair<T> contains an iterator that returns a T type The C# compiler examines the code contained within the iterator and creates the necessary code within the MoveNext method and the Current property to mimic its behavior For the Pair<T> iterator, the C# compiler generates roughly equivalent code (see Listing 1225)
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Listing 1225 C# Equivalent of Compiler-Generated C# Code for Iterators
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using System; using SystemCollectionsGeneric; public class Pair<T> : IPair<T>, IEnumerable<T> { // // The iterator is expanded into the following // code by the compiler public virtual IEnumerator<T> GetEnumerator() { __ListEnumerator result = new __ListEnumerator(0); result_Pair = this; return result; } public virtual SystemCollectionsIEnumerator SystemCollectionsIEnumerableGetEnumerator() { return new GetEnumerator(); } private sealed class __ListEnumerator<T> : IEnumerator<T> { public __ListEnumerator(int itemCount) { _ItemCount = itemCount; } Pair<T> _Pair; T _Current; int _ItemCount; public object Current { get { return _Current; } } public bool MoveNext() { switch (_ItemCount) { case 0: _Current = _PairFirst; _ItemCount++; return true; case 1: _Current = _PairSecond; _ItemCount++; return true; default: return false; } } } }
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Because the compiler takes the yield return statement and generates classes that correspond to what you probably would have written manually, iterators in C# exhibit the same performance characteristics as classes that implement the enumerator design pattern manually While there is no performance improvement, the programmer productivity gained is significant
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