Question

Is there a function like std::for_each that directly passes the iterators instead of the result of dereferencing them?

What we have

std::vector<int> ints;
std::for_each(ints.begin(), ints.end(),
[](int i)
{
  //how to get the iterator of this element???
}

what I am searching for

for_each_iterator(ints.begin(), ints.end(),
[](const std::vector<int>::const_iterator &i)
{
  //we know the iterator here
}

Of course it is fairly trivial to write such a function, but I am asking if there exists a standard solution from std::, std::tr1:: or boost::

Answer 1

There is no such thing in the Standard library. But it is not that hard to implement it yourself:

template<typename It, typename Functor >
void iterate(It begin, It end, Functor && f)
{
    while ( begin != end ) { f(begin); ++begin; }
}

And use it as:

iterate(ints.begin(), ints.end(), [](std::vector<int>::iterator it)
              {
                 //use it
              });

Or use manual loop.