Copy constructor in Software

Drawer Data Matrix ECC200 in Software Copy constructor
Copy constructor
DataMatrix Creator In C#
Using Barcode drawer for .NET framework Control to generate, create DataMatrix image in Visual Studio .NET applications.
27 28 29 Queue(const Queue<T>& aQueue); Queue<T>& operator =(const Queue<T>& rightSide); virtual ~Queue( );
Data Matrix ECC200 Encoder In .NET
Using Barcode encoder for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
The destructor destroys the queue and returns all the memory to the freestore
DataMatrix Generator In VS .NET
Using Barcode maker for .NET framework Control to generate, create Data Matrix ECC200 image in .NET framework applications.
30 31 32
DataMatrix Encoder In VB.NET
Using Barcode drawer for VS .NET Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications.
void add(T item); //Postcondition: item has been added to the back of the queue
Decoding Code 128 In VS .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
33 34 35 36
Paint Code 128 Code Set B In .NET
Using Barcode generator for ASP.NET Control to generate, create Code 128 Code Set C image in ASP.NET applications.
T remove( ); //Precondition: The queue is not empty //Returns the item at the front of the queue //and removes that item from the queue
Bar Code Printer In Visual Basic .NET
Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in VS .NET applications.
37 38 39 40 41 42 43 44
Printing Bar Code In Visual C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
bool isEmpty( ) const; //Returns true if the queue is empty Returns false otherwise private: Node<T> *front;//Points to the head of a linked list //Items are removed at the head Node<T> *back;//Points to the node at the other end of the linked list //Items are added at this end };
Draw Code 3 Of 9 In .NET Framework
Using Barcode creator for .NET Control to generate, create Code-39 image in .NET framework applications.
}//QueueSavitch
UPCA Drawer In Java
Using Barcode encoder for Java Control to generate, create UPC Code image in Java applications.
#endif //QUEUE_H
Making Barcode In .NET
Using Barcode drawer for .NET framework Control to generate, create bar code image in Visual Studio .NET applications.
Linked Data Structures
Drawing Bar Code In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
Display 1717 Program Using the Queue Template Class (part 1 of 2)
Create DataMatrix In Visual C#
Using Barcode creation for .NET framework Control to generate, create Data Matrix image in VS .NET applications.
1 2 3 4 5 6 7 8 //Program to demonstrate use of the Queue template class #include <iostream> #include "queueh" #include "queuecpp" using std::cin; using std::cout; using std::endl; using QueueSavitch::Queue;
UPC-A Recognizer In .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET applications.
9 10 11
EAN-13 Encoder In VS .NET
Using Barcode creator for Visual Studio .NET Control to generate, create EAN-13 image in .NET applications.
int main( ) { char next, ans;
Bar Code Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Contrast this with the similar program using a stack instead of a queue that we gave in Display 1714
Bar Code Maker In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
12 13 14 15 16 17 18 19 20 21
Encoding Code 128 Code Set A In C#.NET
Using Barcode encoder for VS .NET Control to generate, create ANSI/AIM Code 128 image in .NET applications.
do { Queue<char> q; cout << "Enter a line of text:\n"; cinget(next); while (next != \n ) { qadd(next); cinget(next); }
Scanning EAN 13 In VS .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
22 23 24 25 26 27 28 29
Reading Code-39 In VS .NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
cout << "You entered:\n"; while ( ! qisEmpty( ) ) cout << qremove( ); cout << endl; cout << "Again (y/n): "; cin >> ans; cinignore(10000, \n ); }while (ans != n && ans != N );
30 31
return 0; }
Linked List Applications
Display 1717 Program Using the Queue Template Class (part 2 of 2)
SAMPLE DIALOGUE
Enter a line straw You entered: straw Again (y/n): Enter a line I love C++ You entered: I love C++ Again (y/n): of text:
y of text:
A COMMENT
NAMESPACES
Notice that both of the namespaces StackSavitch (Display 1713) and QueueSavitch (Display 1716) define a template class called Node As it turns out, the two definitions of Node are the same, but the point discussed here is the same whether the two definitions are the same or different C++ does not allow you to define the same identifier twice, even if the two definitions are the same, unless the two names are somehow distinguished In this case, the two definitions are allowed because they are in two different namespaces It is even legal to use both the Stack template class and the Queue template class in the same program However, you should use
using StackSavitch::Stack; using QueueSavitch::Queue;
rather than
using namespace StackSavitch; using namespace QueueSavitch;
Most compilers will allow either set of using directives if you do not use the identifier Node, but the second set of using directives provides two definitions of the identifier Node and therefore should be avoided It would be fine to also use either, but not both, of the following:
using StackSavitch::Node;
using QueueSavitch::Node;
Linked Data Structures
Self-Test Exercises
14 Give the definitions for the default (zero-argument) constructor and the member functions Queue<T>::isEmpty for the template class Queue (Display 1716) 15 Give the definitions for the member functions Queue<T>::add and Queue<T>::remove for the template class Queue (Display 1716) 16 Give the definition for the destructor for the template class Queue (Display 1716) 17 Give the definition for the copy constructor for the template class Queue (Display 1716) 18 Give the definition for the overloaded assignment operator for the template class Queue (Display 1716)
s FRIEND CLASSES AND SIMILAR ALTERNATIVES
You may have found it a nuisance to use the accessor and mutator functions getLink and setLink in the template class Node (see Display 1713 or Display 1716) You might be tempted to avoid the invocations of getLink and setLink by simply making the member variable link of the class Node public instead of private Before you abandon the principle of making all member variables private, note two things First, using getLink and setLink is not really any harder for you the programmer than directly accessing the links in the nodes (However, getLink and setLink do introduce some overhead and so may slightly reduce ef ciency) Second, there is a way to avoid using getLink and setLink and instead directly access the links of nodes without making the link member variable public Let s explore this second possibility 8 discussed friend functions As you will recall, if f is a friend function of a class C, then f is not a member function of C; however, when you write the de nition of the function f, you can access private members of C just as you can in the de nitions of member functions of C A class can be a friend of another class in the same way that a function can be a friend of a class If the class F is a friend of the class C, then every member function of the class F is a friend of the class C Thus, if, for example, the Queue template class were a friend of the Node template class, then the private link member variables would be directly available in the de nitions of the member functions of Queue The details are outlined in Display 1718 When one class is a friend of another class, it is typical for the classes to reference each other in their class de nitions This requires that you include a forward declaration to the class or class template de ned second, as illustrated in Display 1718 Note that the forward declaration is just the heading of the class or class template de nition followed by a semicolon A complete example using a friend class is given in Section 174 (see A Tree Template Class )