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Generics are most often used to implement collection classes. Generic collection classes are more type-safe and can be faster than the alternative nongeneric collection classes relying on handles to Object to represent items in the collection. The main efficiency gain is that the retrieval of items from the collection can be done without the use of casts, which usually requires a dynamic type check when the type is retrieved from the collection, or maybe even when adding elements to the collection. Also, if you are using value types, you can often avoid boxing and unboxing entirely by using a generic collection class. In addition to efficiency gains, if you use a generic type, you automatically force the objects in the collection to be of the appropriate type. Since most collections hold objects of the same type (or perhaps types with a common base type), this helps avoid programmatic errors involving adding objects of the wrong type to the collection. In addition, having the strongly typed collection leaves no doubt as to type needed, which is a relief to anyone who has had to try to figure out what type(s) a poorly documented, weakly typed collection takes. In order to use the for each statement on a generic collection, the collection must implement the IEnumerable interface, and you must implement an enumerator class to walk through each element of the collection. Listing 11-8 shows the use of generics to create a linked list class that supports the for each statement to iterate through the generic collection. The generic collection implements IEnumerable, and an enumerator class implementing the IEnumerator interface is created to allow the for each statement to work.
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Listing 11-8. Creating a Linked List That Can Be Traversed with for each // generic_list.cpp using namespace System; using namespace System::Collections::Generic; // ListNode represents a single element in a linked list. generic <typename T> ref struct ListNode { ListNode<T>(T t) : item(t) { } // The item field represents the data in the list. T item; // the next node in the list; ListNode<T>^ next; }; // List represents a linked list. generic <typename T> ref class MyList : IEnumerable<ListNode<T>^> { ListNode<T>^ first; public: property bool changed; // Add an item to the end of the list. void Add(T t) { changed = true; if (first == nullptr) { first = gcnew ListNode<T>(t); } else { // Find the end. ListNode<T>^ node = first; while (node->next != nullptr) { node = node->next; } node->next = gcnew ListNode<T>(t); } }
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// Return true if the object was removed, // false if it was not found. bool Remove(T t) { changed = true; if (first == nullptr) return false; if (first->item->Equals(t)) { // Remove first from list by // resetting first. first = first->next; return true; } ListNode<T>^ node = first; while(node->next != nullptr) { if (node->next->item->Equals(t)) { // Remove next from list by // leapfrogging it. node->next = node->next->next; return true; } node = node->next; } return false; } property ListNode<T>^ First { ListNode<T>^ get() { return first; } } private: virtual System::Collections::IEnumerator^ GetEnumerator_NG() sealed = System::Collections::IEnumerable::GetEnumerator { return GetEnumerator(); }
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virtual IEnumerator<ListNode<T>^>^ GetEnumerator_G() sealed = IEnumerable<ListNode<T>^>::GetEnumerator { return GetEnumerator(); } public: IEnumerator<ListNode<T>^>^ GetEnumerator() { ListEnumerator<T>^ enumerator = gcnew ListEnumerator<T>(this); return (IEnumerator<ListNode<T>^>^) enumerator; } // ListEnumerator is a struct that walks the list, pointing // to each element in turn. generic <typename T> ref struct ListEnumerator : IEnumerator<ListNode<T>^> { ListNode<T>^ current; MyList<T>^ theList; bool beginning; ListEnumerator<T>(MyList<T>^ list) : theList(list), beginning(true) { theList->changed = false; } private: virtual property Object^ Current_NG { Object^ get() sealed = System::Collections::IEnumerator::Current::get { return (Object^) Current; } } virtual property ListNode<T>^ Current_G { ListNode<T>^ get() sealed = IEnumerator<ListNode<T>^>::Current::get { return Current; } } public:
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