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A constructor is not a function. A function is a type, as specified by its return type, and must return a value of that type unless the type is void. A constructor does not return anything, not even void.
The purpose of a constructor is to both allocate and initialise memory for an object of the type being constructed. If a valid object cannot be constructed for any reason, the constructor must throw an exception. If the object's class has no data members (attributes), the class does not require a constructor. This is typically the case for most abstract data types and base classes which are used purely as interfaces.
Constructors differ from functions in that all constructors have an initialisation section that is used specifically to initialise non-static data members. The body of the constructor is rarely used except to perform initialisations that cannot be more easily performed by the initialisation section.
A class may have more than one constructor to provide alternative methods of construction based upon the number and type of arguments supplied (if any). When no arguments are required or all arguments have default values then the constructor is known as the default constructor. If the constructor has only one argument the constructor is known as a conversion constructor (because the argument is converted to an object of the class). However, if the constructor argument is a constant reference to an object of the same class, then it is known as a copy constructor, and when the constructor argument is an rvalue reference, it is known as a move constructor. If copy and/or move constructors are provided for a class, the equivalent assignment operators should also be provided for that class. All other constructors are known as user-defined constructors.
What else can I help you with?
What supports reusability and extensibility of classes in c plus plus?
There are two ways to reuse a class in C++. Composition and inheritance. With composition, any class data member can be an instance of an existing class. With inheritance, we can derive a new class from an existing class. Either way, we create a new class of object with all the properties of the existing class which can be extended and/or replaced with properties of our own.
What is nested class in c plus plus?
s.
Can you use c in c plus plus without using class and object?
Sure.
How can you store Class properties in Array in c sharp?
vcbvcbcvb
What is an instance class in C plus plus?
You have a class(i.g. MyClass): class MyClass{ public: int MyData; }; And then you use the class like this: int main(){ MyClass MyObject; MyObject.MyData=7; }
Can a c plus plus class be derived from a Java class?
No.
What supports reusability and extensibility of classes in c plus plus?
There are two ways to reuse a class in C++. Composition and inheritance. With composition, any class data member can be an instance of an existing class. With inheritance, we can derive a new class from an existing class. Either way, we create a new class of object with all the properties of the existing class which can be extended and/or replaced with properties of our own.
What is the role of object in c plus plus?
An object in C++ is an instance of a C++ class.
What is nested class in c plus plus?
s.
What is the unit of programming in c plus plus A. Function B. class C. object D. Attribute?
B. Class.
What is a method in c plus plus?
In C++, methods are simply class member functions.
Can you use c in c plus plus without using class and object?
Sure.
How can you store Class properties in Array in c?
Yes, you can create array that will store class properties. But all of them have to be of the same type.
How do you create a class in C plus plus?
class class_name { private: data_members; public: member_functions; };
How can you store Class properties in Array in c sharp?
vcbvcbcvb
What are the abstract datatypes in c plus plus?
Class Object Message
What is object in c plus plus?
An object is simply an instance of a class.
