ssrs qr code Note that the operation leaves the current and previous pointers unchanged. in Software

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Note that the operation leaves the current and previous pointers unchanged.
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[CHAP. 13
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The pr e Ins er t ( > function is similar to the ins er t ( ) function, except that it inserts the new node in front of the current node: templatecclass T> void ListItercT>::preInsert(T t) -C ListNodecT>* p = list.newNode(t,current); if (current == list.first) list.first = previous = p; else previous->next = p; The pr e Ins er t operation can be visualized like this:
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Note that like insert, this operation also leaves the current and previous pointers unchanged. The remove ( ) function deletes the current node: template<class T> void ListItercT>::remove() -l if (current == list.first) list.first = current->next; else previous->next = current->next; delete current; current = 0; > ' It leaves the previous pointer unchanged and the current pointer NULL.
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ITERATORS
After:
friends /r--4. . I I
The remove operation can be visualized like this:
ListIter<String>
Afier:
ListIter<String>
Here is a test driver for the list iterator:
#include #include #include main0 <i.ostream.h> "List1ter.h" "String.h"
List<String> friends; ListIter<String> it(friends); it.insert("Bowen, Van"); it++;
// sets current to first item
TEMPLATES AND ITERATORS
[CHAP. 13
it.insert("Dixon, Tom"); it++; it.insert("Mason, Joe"); it++; it.insert('White, Ann"); it++; friends.print(); it.reset(); it++; it = "Davis, Jim"; it++; it.remove(); friends.print(); if (!it) it.preInsert("Morse, friends.print(); for (it.reset(); !it; it++) i t = 1 [ 1' + it() + "1"; friends.print();
sets
current current current
to to to
second third fourth
item item item
// sets // // // // // // Sam"); sets
sets current to first item sets current to second item replace with new name sets current to third item removes third item
// traverses
entire
list
The for loop changes each data value in the list by prepending a left bracket and appending a right bracket to each string. Note that the assignment it = I [ I + it ( ) + I ] I calls the operator ( > ( > class as well as the constructor and operator=0 functions of the ListIter&tring> String(const char*) and operator+= () functiondefinedinthe String class. To give List~ter objects the access to the protected members of List objects that they need to do their job, we need to declare the Li s t I t er class a friend of the L i s t class:
template<class T> class List { friend class ListItereT>; public: // other members protected: ListNodecT>* first; // other members
List
iterators also need the access to the protected members of Lis tNode objects:
template<class T>
class ListNode { friend class List<T>; friend class ListItercT>;
public: ListNode(T& protected: t, ListNodecT>* p) : data(t), next(p) { }
T data;
ListNode* next;
// data field
// points to next node in list
CHAP. 131
TEMPLATES AND ITERATORS
An iterator acts like a window, allowing access to one item at a time in the container. Iterators are sometimes called cursors because they locate a specific element among the entire structure, the same way that a cursor on your computer screen locates one character location. A structure may have more than one iterator. For example, one could declare three iterators on a list like this:
List<float> list; ListItercfloat> itl(list), it2(list), it3(list); itl.insert(ll.01); 'itl++; itl.insert(22.02); itl++; itl.insert(33.03); for (it2.resetO; !it2; 1U++) it2 = lO*it2; // multiplies each stored number by 10 it3 = itl; // replaces 110.1 with 330.3 in first item
The iterators are independent of each other. While i t2 traverses the list, i t 1 remains fixed on the third item.
Review Questions
13.1 13.2 13.3 13.4
What is the difference between a function template and a template function What is the difference between a class template and a template class
What are the advantages and disadvantages of using a linked list instead of a vector
How is an iterator like an array subscript
Solved Programming Problems
Write and test a program that instantiates a function template that returns the minimum of two
values.
A minimum function should compare two objects of the same type and return the object whose value is smaller. The type should be the template parameter T: template <class T> T min(T x, T y) return ( x < y x : y );
This implementation uses the conditional expression operator: (x<y x: than y, the expression evaluates to x; otherwise it evaluates to y.
y ) . If x is less
TEMPLATES AND ITERATORS
[CHAP. 13
Here is the test driver and a sample run: #include #include main0 tout << "min(22, 44) = ' -CC min(22, 44) << endl; tout << "min(66.66, 33.33) = ' -CC min(66.66, 33.33) C-C endl; Rational x(22, 7), ~(314, 100); tout << "min(x, y) = ' << min(x, y) << endl; min(22, 4 4 ) = 2 2 minfcSf5.66, 33,33) = 3 3 . 3 3 mink, y) ;f 324/100 13.6 , <iostream.h> "Rationa1.h"
Write and test a program that instantiates a function template that implements a binary search ofa array of objects.
A search function should be passed the array a, the object key to be found, and the bounds on the array index that define the scope of the search. If the object is found, its index in the array should be returned; otherwise, the function should return -1 to signal that the object was not found: template<class T> int search(T a[], T key, int first, int last) while (first <= last) { int mid = (first + last)/2; if (key < a[mid]) last = mid - 1; else if (key > a[mid]) first = mid + 1; else return mid;
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