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Destructor in c++ programming

in this post, you will learn about the destructor in c++ programming and learn why we need to use destructor in programming and how to declare destructor in programming. 


destructor in c++ programming, learn c++ programming
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Destructor:

 A destructor is used to free the memory which is reserved by the constructor. 


All the rules are the same for the destructor which is applicable for the constructor. 


  • destructor has no return type. 
  • we can't pass the arguments in the destructor.
  • we used [~] tild sign to when declaring the destructor.
  • it also has the same name as the class name.
  • it's automatically called by the compilers at the end of the program.
  • we can only use the one destructor in one class.
  • it's always declared in public scope.

syntax:             class <class-name> // define a class 
           {

                    public:

                    ~<class-name>() // define a destructor
                    {
                       code for execution;
                    }
           };

Exmaple:
             class test
             {
                  public:

                  ~test()
                  {
                      code for exectution;
                  }
            };

Note: always remember one thing about that destructor is always self-called by the compiler at the end of the program. we don't need to call the destructor. 

Example program using destructor:

    #include<iostream>

    class test
    {

             static int a;

             public:

             test()
             {
                  a++;
                  std::cout<<"\n"<<a<<"object created";
             }

             ~test()
             {
                  std::cout<<"\n"<<a<<"object destroyed";
                  a--;
             }
    };

    int main()
    {

          std::cout<<"\n compiler in main block:";
          test t1;

          std::cout<<"\ncompiler in test class:";
          test t2,t3;
          std::cout<<"\nExit from test class:";
          std::cout<<"\nExit from main block:";

          return 0;
    }

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