Can you call a member function in a constructor?

The problem with calling virtual member functions from a constructor is that a subclass can override the function. This will cause the constructor to call the overridden implementation in the subclass, before the constructor for the subclass part of the object has been called.

Is it good practice to call a method in constructor?

No, it’s not good practice. The constructor is a “magic” method which doesn’t return anything and it should never be called manually. PHP calls this when the new constructor or the inspector functions for creating objects are called.

Is it bad practice to call a method in a constructor?

3 Answers. First, in general there’s no problem with calling methods in a constructor. The issues are specifically with the particular cases of calling overridable methods of the constructor’s class, and of passing the object’s this reference to methods (including constructors) of other objects.

How is constructor different from normal member function?

A constructor is different from normal functions in following ways: Constructor has same name as the class itself. Constructors don’t have return type. A constructor is automatically called when an object is created.

Can we call virtual function from constructor?

You can call a virtual function in a constructor, but be careful. It may not do what you expect. In a constructor, the virtual call mechanism is disabled because overriding from derived classes hasn’t yet happened. Objects are constructed from the base up, “base before derived”.

Is it good practice to make all methods public?

4 Answers. Yes it is very bad practice – you’re letting your tools make design decisions for you. I think the main problem here is that you’re trying to treat each individual method as a unit. This is generally the cause of all unit test woes.

Can a constructor call a method C++?

A constructor can call methods, yes. A method can only call a constructor in the same way anything else can: by creating a new instance. Be aware that if a method constructs a new object of the same type, then calling that method from a constructor may result in an infinite loop…

Why one have to avoid calling abstract methods inside the constructor?

In order to call a method, we need to create an object, since the methods inside the interface by default public abstract which means the method inside the interface doesn’t have the body. Therefore, there is no need for calling the method in the interface.

When should you not call virtual member function?

15 Answers. Calling virtual functions from a constructor or destructor is dangerous and should be avoided whenever possible. All C++ implementations should call the version of the function defined at the level of the hierarchy in the current constructor and no further.

Is it safe to call virtual methods in constructor and destructor?

As a general rule, you should never call virtual functions in constructors or destructors. If you do, those calls will never go to a more derived class than the currently executing constructor or destructor. Suppose class B is derived from A, and B defines its own member function f.