Exception Handling and Object Destruction in C++

Destructors in C++ basically called when objects will get destroyed and release memory from the system. When an exception is thrown in the class, the destructor is called automatically before the catch block gets executed.

Algorithm

Begin
   Declare a class sample1.
      Declare a constructor of sample1.
         Print “Construct an Object of sample1”
      Declare a destructor of sample1.
         Print “Destruct an Object of sample1”
   Declare a class sample.
      Declare a constructor of sample2.
         Declare variable i of the integer datatype.
         Initialize i = 7.
         Print “Construct an Object of sample1”.
         Throw i.
      Declare a destructor of sample2.
         Print “Destruct an Object of sample2”
   Try:
      Declare an object s1 of class sample1.
      Declare an object s2 of class sample2.
   Ctach(int i)
      Print “Caught”.
      Print the value of variable i.
End.

Example Code

 Live Demo

#include <iostream>
using namespace std;
class Sample1 {
   public:
      Sample1() {
         cout << "Construct an Object of sample1" << endl;
      }
      ~Sample1() {
         cout << "Destruct an Object of sample1" << endl;
      }
};
class Sample2 {
   public:
      Sample2() {
         int i =7;
         cout << "Construct an Object of sample2" << endl;
         throw i;
      }
      ~Sample2() {
         cout << "Destruct an Object of sample2" << endl;
      }
};
int main() {
   try {
      Sample1 s1;
      Sample2 s2;
   } catch(int i) {
      cout << "Caught " << i << endl;
   }
}

Output

Construct an Object of sample1
Construct an Object of sample2
Destruct an Object of sample1
Caught 7