Constructors and Destructors. OOC 4 th Sem, B Div Prof. Mouna M. Naravani
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1 Constructors and Destructors OOC 4 th Sem, B Div Prof. Mouna M. Naravani
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3 A constructor guarantees that an object created by the class will be initialized automatically.
4 Ex: create an object integer int1; Object int1 is created, and also initializes its data members m and n to zero. There is no need to write any statement to invoke the constructor function. If a normal member function is defined for zero initialization, we would need to invoke this function for each of the objects separately. This would be very inconvenient, if there are a large number of objects.
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7 Default Constructor Accepts no parameters. Also called as Zero Constructor. If no such constructor is defined, then the compiler supplies a default constructor.
8 Parameterized Constructor A constructor that takes arguments or parameters are called Parameterized constructors. We can pass the arguments to constructor function when object are created.
9 We must pass the initial values as arguments to the constructor function when an object is declared. This can be done in two ways: By calling the constructor explicitly. By calling the constructor implicitly. By calling the constructor explicitly integer int1 = integer(10, 100); This statement creates an integer object int1 and passes the values 10 and 100 to it. By calling the constructor implicitly integer int1(10, 100); Also called as short hand method, shorter, better and easy to implement.
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11 Copy Constructor Copy Constructor is used to declare and initialize an object from another object. Ex: integer I2 ( I1 ); This would define an object I2 and at the same time initialize it to the values of I1. Another form: integer I2 = I1;//it simply assigns the values of I1 to I2, member-by-memeber The process of initializing through a copy constructor is known as copy initialization. A copy constructor takes a reference to an object of the same class as itself as an argument.
12 Multiple Constructors in a Class class integer { int m, n; public: integer() { m=0; n=0; } integer(int a, int b) { m=a; n=b; } integer(integer & i) { m = i.m; n=i.n; }; } //Default Constructor //Parameterized Constructor //Copy Constructor 1. Object declarations: integer I1; - invokes default constructor and set both m and n of I1 to Object declarations: integer I2(20, 40); - invokes parameterized constructor and set both m and n of I2 to 20 and 40 respectively. 3. Object declarations: integer I3(I2); - invokes copy constructor which copies the values of I2 into I3.
13 The actual parameter, when specified, overrides the default value.
14 Default Constructor A :: A() Default Argument Constructor A :: A(int = 0) The default argument constructor can be called with either one argument or no arguments. When called with no arguments, it becomes a default constructor. When both these forms are used in a class, it causes ambiguity for a statement such as: A a; The ambiguity is whether to call A::A() or A::A(int = 0)
15 Destructors Used to destroy the objects that have been created by a constructor. The destructor is a member function whose name is the same as the class name but is preceded by a tilde( ~). Destructor of class integer can be defined as; ~integer() { } Destructor never takes any argument nor does it return any value. It will be invoked implicitly by the compiler upon exit from the program to clean up storage that is no longer accessible. (No need to call it explicitly) Destructors releases memory space for future use. Destructors destroy the objects in the reverse order of creation.
16 Whenever new is used to allocate memory in the constructors, we should use delete to free that memory. This is required because when the pointers to objects go out of scope, a destructor is not called implicitly.
17 Constructors.cpp Destructors.cpp DestructoroutofScope.cpp beforedestructor.cpp CopyConstructors.cpp OverloadedConstructors.cpp ParameterizedConstructors.cpp
18 References Sourav Sahay, Objected Oriented Programming with C++ E Balagurusamy, Objected Oriented Programming with C++ P. B. Kotur, Objected Oriented Programming with C++
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