Is there a memory leak

[forrestarrow]

Hi All,
I just read an instereing article and want to test if there is a memory leak for the following code. The code is following:

#include <iostream>
 
using namespace std;
class A{
public:
        A() {   cout << " Constructor!\n";      }
        ~A() {  cout << "Destructor!\n";        }
 
};
 
int main() {
        A * ptA = new A(* new A);
        delete ptA;
        return 0;
}
 

The output is,
Constructor!
Destructor!

Should there be two objects created and destructed? Why only pari of output? Thanks.

Best,
Jason

[Banfa]

There are 2 objects created, however you create one of them through the copy constructor (provided by default by the compiler) so you get not output message for it.

Since you do not store the pointer returned from (* new A) you can not delete it, this object is never deleted and so you get a memory leak.

When you call new you have to explicitly call delete.

What this means is that the output you get is the construct message of 1 object and the delete message of the other.