In Which Situations To Delete A Pointer

Question

My following question is on memory management. I have for example an int variable not allocated dynamically in a class, let\'s say invar1. And I\'m passing the memory addres

Answer 1

just an appendix to the other answers

You can get rid of raw pointers and forget about memory management with the help of smart pointers (shared_ptr, unique_ptr).

The smart pointer is responsible for releasing the memory when it goes out of scope.

Here is an example:

#include 
#include 

class ex1{
public:
    ex1(std::shared_ptr p_intvar1)
    {
        ptoint = p_intvar1;
        std::cout << __func__ << std::endl;
    }
    
    ~ex1()
    {
        std::cout << __func__ << std::endl;
    }
private:
    std::shared_ptr ptoint;
};

int main()
{
    std::shared_ptr pi(new int(42));
    std::shared_ptr objtoclass(new ex1(pi));

    /* 
     * when the main function returns, these smart pointers will go
     * go out of scope and delete the dynamically allocated memory
     */ 

    return 0;
}

Output:

ex1
~ex1