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reference is actually a pointer to the class. Also, note that the constructor initializes both data members. The while loop continues reading ints into n until the user enters the end-of-file character. Within the loop, it gets a new node, inserts the int into its data member, and connects the new node to the previous node (pointed to by q). Then, the for loop traverses the list. It starts with the node pointed to by p (the last node constructed) and continues until p->next is NUL (last node in the list). static Data Members Sometimes a value is needed by all members of the class. It would be inefficient to store this value in every object of the class so we declare the data member to be static by including the static keyword at the beginning of the variable's declaration. It also requires that the variable be defined globally. The syntax looks like this: class X { public: static int n; // declare n a static data member }; int X::n = 0; // definition of n Static variables are automatically initialized to 0, so the explicit initialization is unnecessary unless you need a nonzero initial value.
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Example 8.9 A static Data Member class Widget { public: Widget() { ++count; } ~Widget() { -count; } static int count }; The Widget class maintains a static data member count, which keeps track of the number of Widget objects in existence. Each time a widget is created the counter is incremented, and
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int Widget :: count = 0; void main( ) { Widget w, x; cout <<w.count <<" widgets.\n"; { Widget w, x, y, z; cout <<w.count <<" widgets.\n"; } cout <<w.count <<" widgets.\n"; Widget y; cout <<w.count <<" widgets.\n"; }
each time a widget is destroyed the counter is decremented.
2 6 2 3
widgets. widgets. widgets. widgets.
Notice how four widgets are created in the inner block, and then destroyed when program control leaves that block, reducing the global number of widgets from 6 to 2. A static data member is like an ordinary global variable: only one copy of the variable exists no matter how many instances of the class exist. The main difference is that it is a data member of the class, and so may be private. If we made the static variable count private, we would need an access function like numWidgets() to obtain the value in the main program: int numWidgets() { return count; } static Function Members Like most methods, numWidgets() requires that it be owned by some instance of the class. But it returns the value of the static data member count that is independent of the individual objects themselves. Since the action of the function is independent of the actual function objects, it would make sense to have the calls independent of them too. This can be done by declaring the function to be static. Example 8.10 A static Function Member The Widget class maintains a static data member count, which keeps track of the number of Widget objects in existence globally. class Widget { public: Widget() { ++count; }
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~Widget() { -count; } static int num() { return count; } private: static int count; }; Declaring the num() function to be static renders it independent of the class instances. So now it is invoked simply as a member of the Widget class using the scope resolution operator ": :". cout <<Widget: :hum() <<" widgets. \n"; This allows the function to be called before any objects have been instantiated. Now the method num() has no "this" pointer. As a static method, it is associated with the class itself, not with its instances. Static methods can access only static data from their own class.
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