How to make a for loop variable const with the exception of the increment statement?

Question

Consider a standard for loop:

for (int i = 0; i < 10; ++i) 
{
   // do something with i
}

I want to prevent the variable i fr

Answer 1

The KISS version...

for (int _i = 0; _i < 10; ++_i) {
    const int i = _i;

    // use i here
}

If your use case is just to prevent accidental modification of the loop index then this should make such a bug obvious. (If you want to prevent intentional modification, well, good luck...)