Question

I have these classes:

class A
{
};

class B : public A
{
public:
    B(int val);
private:
    int* m_int;
};

B::B(int val)
{
    m_int = &val;
}

I call the code like so, inside 1 function, i know the vars will be destroyed once they are out of scope, but I only need them in this function:

{
...
int _int = 0;
B obj(_int);
A *obj2 = &obj;
_int++;
...
}

The problem is that _int is changing to 1, but m_int stays the same. I need m_int to reflect what the value in _int is, without the need to update it with code. I thought having a pointer to a memory location would work?

The second problem is that when I hover my mouse over obj2, to see the values of obj, I get the message “children could not be evaluated”.

Answer 1

The pointer m_int will stay the same but the value pointed to *m_int will change, you’ll also have to pass the value val by reference to the function.

EDIT: Saw your edited question, since this is done from the constructor you can do:

class B : A
{
public:
    B(int& val) : m_int(val) {}
private:
    int& m_int;
};

To have m_int reference the same variable.