Considering the following code which looks like that the destructor doesn't do any real job, valgrind showed me clearly that it has memory leak without using the destructor. Any body can explain me what does the destructor do in this case?

#include <iostream>                                                                    
using namespace std;                                                                   

class A                                                                                
{                                                                                      
private:                                                                               
    int value;                                                                         
    A* follower;                                                                       
public:                                                                                
    A(int);                                                                            
    ~A();                                                                        
    void insert(int);                                                                  
};                                                                                     

A::A(int n)                                                                            
{                                                                                      
    value = n;                                                                         
    follower = NULL;                                                                   
}                                                                                      

A::~A()                                                                             
{                                                                                   
     if (follower != NULL)                                                           
         delete follower;                                                               
     cout << "do nothing!" << endl;                                             
}                                                                                   

void A::insert(int n)                                                                  
{                                                                                      
    if (this->follower == NULL) {                                                      
        A* f = new A(n);                                                               
        this->follower = f;                                                            
    }                                                                                  
    else                                                                               
        this->follower->insert(n);                                                     
}                                                                                      

int main(int argc, char* argv[])                                                       
{                                                                                      
    A* objectA = new A(1);                                                             

    int i;                                                                             
    for (i = 0; i < 10; i++)                                                           
        objectA->insert(i);                                                            

    delete objectA;                                                                    
}