Frequently Asked Questions on C++ Constructors

What Are the Functions That Are Generated by the Compiler by Default, If We Do Not Provide Them Explicitly?

The functions that are generated by the compiler by default if we do not provide them explicitly are:

1. Default Constructor
2. Copy Constructor
3. Move Constructors
4. Assignment Operator
5. Destructor

Can We Make the Constructors Private?

Yes, in C++, constructors can be made private. This means that no external code can directly create an object of that class.

How Constructors Are Different from a Normal Member Function?

A constructor is different from normal functions in following ways: 

• Constructor has same name as the class itself
• Default Constructors don’t have input argument however, Copy and Parameterized Constructors have input arguments
• Constructors don’t have return type
• A constructor is automatically called when an object is created.
• It must be placed in public section of class.
• If we do not specify a constructor, C++ compiler generates a default constructor for object (expects no parameters and has an empty body).

Can We Have More Than One Constructor in a Class?

Yes, we can have more than one constructor in a class. It is called Constructor Overloading.

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Constructor in C++ is a special method that is invoked automatically at the time of object creation. It is used to initialize the data members of new objects generally. The constructor in C++ has the same name as the class or structure. It constructs the values i.e. provides data for the object which is why it is known as a constructor.

• Constructor is a member function of a class, whose name is the same as the class name.
• Constructor is a special type of member function that is used to initialize the data members for an object of a class automatically when an object of the same class is created.
• Constructor is invoked at the time of object creation. It constructs the values i.e. provides data for the object that is why it is known as a constructor.
• Constructors do not return value, hence they do not have a return type.
• A constructor gets called automatically when we create the object of the class.
• Constructors can be overloaded.
• A constructor can not be declared virtual.