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A Closer Look at Classes and Objects
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This calls the queue class s constructor directly, passing the value 101 to it The object returned by the constructor is assigned to a The second method is shorter and more to the point In this method, the argument or arguments must follow the object s name and be enclosed in parentheses This code accomplishes the same thing as the previous declaration:
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queue a(101);
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Since this method is used by virtually all C++ programmers, it is used by this book nearly exclusively The general form of passing arguments to constructor functions is class-type obj(arg-list); Here, arg-list is a comma-separated list of arguments that are passed to the constructor The following version of the queue program demonstrates passing arguments to constructor functions:
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#include <iostream> using namespace std; C++ // This creates the class queue class queue { int q[100]; int sloc, rloc; int who; // holds the queue's ID number public: queue(int id); // parameterized constructor ~queue(); // destructor void qput(int i); int qget(); }; // This is the constructor function queue::queue(int id) { sloc = rloc = 0; who = id; cout << "Queue " << who << " initialized\n"; } // This is the destructor function
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queue::~queue() { cout << "Queue " << who << " destroyed\n"; } void queue::qput(int i) { if(sloc==99) { cout << "Queue is full\n"; return; } sloc++; q[sloc] = i; } int queue::qget() { if(rloc == sloc) { cout << "Queue underflow\n"; return 0; } rloc++; return q[rloc]; } int main() { queue a(1), b(2); aqput(10); bqput(19); aqput(20); bqput(1); cout cout cout cout << << << << aqget() aqget() bqget() bqget() << << << << " "; " "; " "; "\n";
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// create two queue objects
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return 0; }
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A Closer Look at Classes and Objects
This program produces the following output:
Queue Queue 10 20 Queue Queue 1 initialized 2 initialized 19 1 2 destroyed 1 destroyed
As you can see by looking at main( ), the queue associated with a is given the ID number 1, and the queue associated with b is given the number 2 Although the queue example passes only a single argument when an object is created, it is possible to pass several Here, for example, objects of type widget are passed two values:
#include <iostream> using namespace std; class widget { int i; int j; public: widget(int a, int b); void put_widget(); } ; widget::widget(int a, int b) { i = a; j = b; } void widget::put_widget() { cout << i << " " << j << "\n"; } int main() { widget x(10, 20), y(0, 0); xput_widget(); yput_widget();
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return 0; }
This program displays
10 20 0 0
Constructors with One Parameter: A Special Case
If a constructor has only one parameter, then there is a third way to pass an initial value to that constructor For example, consider the following short program
#include <iostream> using namespace std; class X { int a; public: X(int j) { a = j; } int geta() { return a; } }; int main() { X ob = 99; // passes 99 to j cout << obgeta(); // outputs 99 return 0; }
Here, the constructor for X takes one parameter Pay special attention to how ob is declared in main( ) In this form of initialization, 99 is automatically passed to the j parameter in the X( ) constructor That is, this statement
X ob = 99; // passes 99 to j
is handled by the compiler as if it were written like this:
X ob = X(99);
21:
A Closer Look at Classes and Objects
In general, any time that you have a constructor that requires only one argument, you can use either ob(i) or ob = i to initialize an object The reason for this is that whenever you create a constructor that takes one argument, you are also implicitly creating a conversion from the type of that argument to the type of the class Remember that the alternative shown here applies only to constructors that have exactly one parameter
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