Re: Overriding new and delete
On Aug 10, 1:50 am, Alexander Bartolich <alexander.bartol...@gmx.at>
wrote:
MJ_India wrote:
[...]
2) If I add extra parameters to new and delete [for ex: void *operator
new(size_t count, bool dummy), void delete(void *where, bool dummy)]
and redefine new to new(true) in required modules.
a) Operator new (and new[]) works fine, but I don't know how to make
the delete work.
You have to call delete as a function, called "operator delete".
void* operator new(size_t size, bool dummy)
{
cout << "new size=" << size << " dummy=" << dummy << '\n';
return malloc(size);
}
void operator delete(void* p, bool dummy)
{
cout << "delete dummy=" << dummy << '\n';
free(p);
}
int main()
{
int* p = new (true) int;
operator delete(p, true);
}
Thank you for the quick reply.
1) If I use delete as an operator function call, it won't call
destructor.
2) It is not a natural syntax as per my project requirements.
#define new new(true)
can be done conditionally in configuration to keep the new/new[]
syntax intact. But I found no way to replace delete.
There is a fifth option. You can define new/delete as members of class.
In this case new definitions will be useful to allocate class object
but not for the allocations that would be done inside class member
functions definitions.