This show that destructor is called on object at end of the block where they were called. With valgrind you could also see that the 42 allocated ints (42*4=168 bytes) are still here --> LEAK SUMMARY: definitely lost: 168 bytes in 1 blocks

destructor.cpp

#include <iostream>
#include <stdlib.h>

class Monstre {
        public:
                Monstre() { A = (int*)malloc(sizeof(int)*42); }

                ~Monstre() { std::cout << "iDestroy the new way of iPhoning." << std::endl; }
        private:
                int* A;
};

int main() {

        int a = 5;
        if (a > 3) {
                Monstre Alf;
                std::cout << "In the main, doing nothing" << std::endl;
        }

        std::cout << "Program over." << std::endl;
        return 0;
}