Re: when delete do not call destructor

S S <sarvesh.singh@gmail.com> wrote:


I tried the following:

#include <iostream>

using namespace std;

void* My_allocation_routine(int* i, size_t n)
{
   cout << "My_allocation_routine\n";
   return malloc(n);
}

void My_deallocation_routine(void* p, size_t n)
{
   cout << "My_deallocation_routine\n";
   if (p)
      free(p);
}

class A
{
   static int someInternalVar;
public:
   void *operator new(size_t, void *p)
   {
      return(p);
   }
   
   void *operator new(size_t n) throw(std::bad_alloc)
   {
      return My_allocation_routine(&someInternalVar, n);
   }
   
   void operator delete(void* p, size_t n)
   {
      My_deallocation_routine(p,n);
   }

   ~A()
   {
      cout << "in d_tor\n";
   }
};

int A::someInternalVar = 0;

int main()
{
   A* obj = new A;
   delete obj;
}

The output was as follows:

My_allocation_routine
in d_tor
My_deallocation_routine