C++ Destructor

In C++, a C++ Destructor is a special method but that will be called once the object is destroyed or deleted.

Syntax of C++ Destructor

~class_name()    
{   
   //code to be executed
}

Why using C++ Destructor

Destructors are used to release any resources allocated by the object. E.g., class Lock might lock a semaphore, and the destructor will release that semaphore. The most common example is when the constructor uses new, and the destructor uses delete.

C++ Example of Destructor

#include <iostream>
using namespace std;
class SayHelloWorld{
public:
  //Constructor
  SayHelloWorld(){
    cout<<"SayHelloWorld Constructor has been called"<<endl;
  }
  //Destructor
  ~SayHelloWorld(){
    cout<<"SayHelloWorld Destructor has been called"<<endl;
   }

   void displayHelloWorldMessage(){
     cout<<"Hello World!"<<endl;
   }
};
int main(){

   SayHelloWorld helloWorldObject;

   helloWorldObject.displayHelloWorldMessage();

   return 0;
}

Output

SayHelloWorld Constructor has been called
Hello World!
SayHelloWorld Destructor has been called

Conclusion

In this page (written and validated by A. Gawali) you learned about C++ Destructor . What's Next? If you are interested in completing Cpp tutorial, your next topic will be learning about: Cpp Class Constructor With parameters.

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