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CHAP. 131
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Here is a test driver and a sample run: main0 Matrixcfloab a(2,3); a[O][O] = 0.0; a[O][l] = 0.1; a[O][2] = 0.2; a[l][O] = 1.0; a[l][l] = 1.1; a[l][2] = 1.2; tout cc 'The matrix a has ' << a.rows() << ' rows and ' CC a.columns() << 'I columns:\n"; for (int i=O; i<2; i++) { for (int j=O; j<3; j++) tout << a[i][j] << ' "; tout << endl;
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The matrix m can be visualized like this:
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Vector0 T Vector0 operator[] () TI Matrixcfloat> \Vector<floaty
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The diagram shows the situation during one of the subscript access calls a [ 1 ] [ 2 ] . Notice that the actual data values 0.2, 1.1, etc., are stored in two separate vet tar< float > objects. The Matrix< f 1 oat > object m only contains pointers to those objects.
Note that our Matrix class template used composition with the Vet tor class template, while our Array class template used inheritance with the Vet tor class template. 13.7 A CLASS TEMPLATE FOR LINKED LISTS Linked lists were introduced in 8. (See Example 8.2.) These data structures provide an alternative to vectors, with the advantage of dynamic storage. That is, unlike vectors, linked lists can grow and shrink dynamically according to how many data items are being stored. There is no wasted space for unused elements in the list.
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[CHAP. 13
EXAMPLE 13.7 A List Class Template
A list consists of a linked sequence of nodes. Each node contains one data item and a link to the next node. So we begin by defining a Li s tNode class template:
templatecclass T> class ListNode { friend class ListcT>; public: ListNode(T& t, ListNode<T>* p) : data(t), next(p) { } protected: T data; // data field ListNode* next; // points to next node in list 1;
The constructor creates; a new node, assigning the T value t to its data field and the pointer p to its next field:
String ListNode<String>
If T is a class (instead of an ordinary type), its constructor will be called by the declaration of data. Note that the class Li s tcT> is declared here to be a friend of the Li s tNode class. This will allow the member functions of the Li s t class to access the protected members of the Node class. Here is the Li s t class template interface:
templatecclass T> class List { public: List0 : first(O) { > -List(); void insert(T t); // insert t at front of list // remove first item t in list int remove(T& t); int isEmpty() { return (first == 0); } void print(); protected: ListNodecT>* first; ListNodecT>* newNode(T& t, ListNode<T>* p) { ListNodecT>* q = new ListNodecT>(t,p); return q; }
i s t object contains only the pointer f i r s t:
list
Listcinb
This points to a Li s tNode object. The default constructor initializes the pointer to NULL. After items have been inserted into the list, the first pointer will point to the first item in the list.
CHAP. 131
TEMPLATES AND ITERATORS
The newNode function invokes the new operator to obtain a new Lis tNode object by means of the Li s tNode ( ) constructor. The new node will contain the T value t in its data field and the pointer p in its next field. The function returns a pointer to the new node. It is declared pro tee ted because it is a utility function that is used only by the other member functions. The Li s t destructor is responsible for deleting all the items in the list:
templatecclass T> List<T>::-List0 ListNode<T>* temp; for (ListNodecT>* p = first; p; ) { temp = p; p = p->next; delete temp;
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