using extra loop expressions in for loop (with auto ) question.

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C++

C++11

in C++, I know that I can create for loops with multiple "loop expression>

// simple straight-ish C++ loop
std::vector<Potato> potatoVector;
// fill vector with some potatoes
std::vector<Potato>::iterator it = potatoVector.begin();
int index = 0;
for ( it ; it != potatoVector.end() ; ++it, ++index )
{
  // do something with potatoes.. and the index...
}

Now, if I want to modernize this, I would do something like this (C++11)

int index = 0;
for ( auto potato : potatoVector, ++index )
{
  // do something.
}

But that does not compile; it seems I cannot add loop expression in that kind of loop.

Is there a better way/pattern to do that ?
or is the following code the only way to do it (add the index increment in the loop block )?

int index = 0;
for ( auto potato : potatoVector )
{
  // do something.
  ++index;
}

Thanks

Max.