Question for a senior C++ developer. Dare you?

Kofr

What must be in SR.h to achieve desired printed values?

#include <stdio.h>
#include "SR.h"

int main()
{
    int j = 1;
    int a[] = {2, 3};
    {
        SR x(j), y(a[0]), z(a[1]);

        j = a[0];
        a[0] = a[1];
        a[1] = j;

        printf("j = %d, a = {%d, %d}\n", j, a[0], a[1]);
        //        j = 2, a = {3, 2} - we want that the printed be this
    }
    printf("j = %d, a = {%d, %d}\n", j, a[0], a[1]);
    //        j = 1, a = {2, 3} -  - we want that the printed be this
}
```

raven-worx

@Kofr
so you want instead of printing

j = 2, a = {3, 2}
j = 2, a = {3, 2}

it should print

j = 2, a = {3, 2}
j = 1, a = {2, 3}

right???

If so you need to get around the scoping and create new "inner" variables" and create a copy of the "outer" variable values.

SGaist

Hi,

To add to @raven-worx, looks like SR is just useless since it's not used anywhere.

Kofr

@SGaist solution is made by SR.

kshegunov

Here:

template<class T>
class SR
{
public:
    SR(T & v)
        : ref(v), val(v)
    {
    }

    ~SR()
    {
        ref = val;
    }

private:
    T & ref, val;
}

But what would be the purpose of this, beside being an example of bad programming?