how to count the number of objects created in c++

Question

how to count the number of objects created in c++

pls explain with a simple example

Answer 1

You have to overload the new and delete operators to count memory allocations.

void * operator new (size_t size)
{
    void * p = malloc (size);
    num_allocations++;
    return p;
}

void operator delete (void * p)
{
    num_deletions++;
    free (p);
}