Does anyone know about virtual constructors and destructors?

[Ram Bharose]

Hello friend,

I have enough knowledge about the constructor and destructor from the java programming. But the 'virtual constructors and destructors' seems to be very difficult to understand. Constructor comprises same name as per the class name, but what about the 'virtual constructors'? If you posses knowledge about the 'virtual constructors and destructors' then please let me aware about that. I am waiting for your reply.

[kelfro]

Unlike Java, C + + offers no mechanism to prohibit inheritance (final keyword in Java). You must therefore check, before inheriting, the base class does have a virtual destructor. No need to declare a virtual destructor if it is not a base class or subclass. If a class has a virtual constructors (this includes the destroyer), then additional data are added to the class. These data allow the program running to know what methods must be used in case of inheritance.

[Zecho]

Refer following details about the 'virtual constructors':

• In virtual constructors the definition of a class is not required when not needed.
• It has the same name as the class has.
• Virtual constructor can have arguments
• virtual constructor has no return type.

[Reegan]

The virtual destructor of an object created is called statically implicitly when the program leaves the scope in which the object are created. If an object with a virtual destructor is destroyed by using delete operator to a super class pointer, then super class destructor function is called on the object. The destructor is a function whose definition is very similar to that the manufacturer, except that the name of the destructor is preceded by a tilde (~) and he has no argument.

[opaper]

The virtual constructors are related to the code associated with the class of the object, rather than the class pointer. A class has a virtual constructors if it has a explicitly defined destructor or if it has a member of base class that has a destructive. destructor can not be overloaded, or have a default value for its arguments, since it simply has not. The virtual destructive is called differently depending on whether the object to which it belongs has been created statically or dynamically.

[MindSpace]

Hi friend,

If you create polymorphic classes that is inheriting from other classes, you must declare your virtual destructors unless you want to have some strange behavior and memory leaks. For to declare virtual destructors, Just add the keyword virtual before the name of the destroyer of the base class and all its derived classes. The destroyers were generally much less need to be defined as manufacturers, so this is the default destructor is called if necessary.