C / C++ / MFC

#include <stdio.h>
#include <malloc.h>
  
struct test{
    int a;
    int b;
    int c;
  
    void * operator new(size_t);
    void operator delete(void*);
  
    void * operator new[] (size_t); 
    void operator delete[] (void*);
};
  
void * test::operator new(size_t sz)
{
    return malloc(sz);
}
   
void __cdecl test::operator delete(void* t)
{
    free(t);
}
   
void * test::operator new[](size_t sz)
{
    return malloc(sz);
}
   

void test::operator delete[](void* t)
{
    free(t);
}
   
   
int main(int argc, char* argv[])
{
    printf("Hello World!\n"); 
  
    // calls t::new & t::delete
    test* t = new test;
    delete t;
   
    // calls t::new[] & t::delete[]
    t = new test[20];
    delete []t;
   
    // calls global new and delete
    int * p = new int;
    delete p;
   
    return 0;
}